JP2007163743A - Display equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide display equipment obtaining excellent characteristics such as durability and high precision by possessing a high modulus of elasticity and mechanical strength in an insulated base substance of a printed wiring board and using a specific polyimide film without causing strain and connection inferiority due to thermal history. <P>SOLUTION: In the compact display equipment connected mutually by the same printed wiring board by a display element having opposite angle 3 inches or less and a drive circuit driving the element, a polyimide film used has a linear expansion coefficient of 2-15 ppm/°C and a main component comprising polyimidebenzooxazole obtained by making the polyimide film having a curl degree of 10% or less at 300°C in the insulated base substance of the printed wiring board, in particular, aromatic diamines having benzooxazole structure react with aromatic tetracarboxylic acid anhidrides. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a small display device having a diagonal size of 3 inches or less, and more specifically, a display using a printed wiring board using a polyimide film having specific physical properties that can be preferably applied to a display device having a diagonal size of 3 inches or less as an insulating base material. Regarding equipment.
More specifically, display units such as small flat-screen televisions, handheld televisions, automobile televisions, mobile small personal computers, portable display devices, display units for audio equipment, display units for portable music players, Display unit for in-vehicle amusement devices, display for portable communication devices, such as mobile phones, mobile vehicles such as automobiles, display devices in cockpits such as ships and airplanes, display units for car navigation systems, guidance display in public transportation, Advertising, public relations media, wristwatches, head mounted displays, video cameras, digital still cameras, etc., electronic dictionaries, PDAs, electronic notebooks, GPS, portable game machines, portable karaoke machines, toy displays, digital and silver salt cameras Display unit, status display / control unit display unit, computer Displays, displays for TV monitors, displays for controls, watches, watches that use electronic displays in watches other than watches, remote displays for various home appliances, refrigerators, washing machines, microwave ovens, electricity Kettle, jarpot, dishwasher, electric refrigerator, cooking heater, ventilation fan, electric water heater, natural refrigerant heat pump water heater, household electric well pump, air purifier, electric washing machine, washing machine (fully automatic, two tubs) Formula), washing / drying machine, vacuum cleaner, warm water washing toilet seat, electric razor, household garbage processing machine, cooler, etc., home appliance display, electric lighting fixture display, video recorder, DVD recorder, HD recorder , Stereo, home theater system, small display for AV equipment such as radio, copier, printer, FAX, telephone, etc. Display units for office equipment, printers, CD drives, FD drives, MO drives, DVD drives, hard disks, IC cards, magnetic cards, credit cards, and other computer peripherals, memory card readers / writers, modems, routers, hubs, and other computer peripherals Small display part of equipment, door phone, fire alarm system, gas detection, security system, etc., small display part of building equipment, health meter, blood pressure measuring instrument, electric massage instrument, etc. Construction machinery, mining machinery, chemical machinery and storage tanks, pulp and paper machinery, plastic processing machinery, pumps, compressors and blowers, hydraulic machinery and pneumatic equipment, power transmission equipment, agricultural machinery and wood processing machinery, metal machine tools , Metal processing machinery and casting equipment, food processing Industrial machinery, packaging machinery and packing machinery, sewing machines and textile machinery, refrigerators and refrigerator applied products, vending machines, automatic ticket gates / automatic entrance machines, rotating electrical machinery, stationary electrical machinery, switching control equipment, semiconductor-related, Production equipment in all industries such as home appliances, automobiles, display units for machine tools, electronic exchanges, digital transmission equipment, display units in communication facilities, terminal equipment such as automatic teller machines (including payment machines), electrical measurement The present invention relates to a small display device used for measuring instruments, electronic application devices, measuring devices, and the like.

Small display devices include liquid crystal display devices, electroluminescence display devices, plasma displays, electrophoretic display devices, field emission display devices, electrochromic display devices, rotating sphere display devices, rotating cylindrical display devices, electronic jet fluids For example, display devices using dry powder movement are known. Such a display device includes a display panel that embodies the display principle itself, and a driving circuit for generating and transmitting a driving signal as its constituent members.
Such drive signals are generated and transmitted by an integrated circuit called a driver IC (including a semiconductor chip) and connected to the display panel via a very thin circuit board called a tape substrate.
With the recent increase in definition of display panels, the number of drive signal lines led from driver ICs has increased to a very large number, and the pitch of wiring has become very small. For this reason, expansion and contraction of the wiring pitch due to changes in temperature and humidity, warping of the tape substrate, twisting and deformation of the wiring due to deformation have an increasing effect on the product yield.

As these conventional display devices, for example, as a light-receiving display device that is easy to adjust to eyes like printed matter and does not cause eye fatigue due to external light, a spherical, ellipsoidal or columnar display element, and a display element A display unit (see Patent Document 1) in which one or more of these are enclosed in a transparent hollow cylinder, and a plurality of microcapsules whose optical reflection characteristics change by application of an electric field are reliably installed at a desired position. As a result, a display panel capable of high-definition and high-quality multi-color and color display (see Patent Document 2), an array side substrate on which pixel electrodes and an electrochromic layer are formed, a counter electrode and an electrochromic layer are formed. In an electrochromic display device comprising a color filter side substrate and an electrolytic layer injected between the array side substrate and the color filter side substrate, the pixel electrode and In addition, a high-definition electrochromic display device that prevents a short circuit between pixel electrodes and a short circuit between electrochromic layers between adjacent pixels by providing a partition around the electrochromic layer (Patent Document 3) And other liquid crystal display elements (TN liquid crystal, STN liquid crystal, ferroelectric liquid crystal, guest-host liquid crystal, cholesteric liquid crystal, etc.), EL display element, electrophoretic display element, electrochromic type A display element, a redox type display element, a rotating sphere type or rotating cylindrical type display element, a display type display element by moving dry powder, and the like are also known.
JP 2002-202536 A JP 2002-365668 A JP 2005-049770 A

Many of these various display elements as described above are known, and many display apparatuses including other elements to be included as a display apparatus such as a semiconductor that bears a drive unit that operates integrally with these display elements are also proposed. Has been.
For example, in an active matrix semiconductor display device in which a pixel TFT and a drive circuit TFT are integrally formed on the same substrate, a gap holding material (polyimide is used as the gap holding material) disposed between the pixel region and the drive circuit region. Resin is an example), the cell gap can be controlled, and a uniform cell thickness can be obtained over the entire semiconductor display device, and the conventional grain spacer is not used. Therefore, when bonding the active matrix substrate and the counter substrate, An active matrix semiconductor display device (see Patent Document 4) that can prevent damage to the drive circuit TFT in which no stress is generated in the drive circuit TFT, or a liquid crystal sealed between a pair of substrates, On the substrate in a matrix form in an intersecting state vertically and horizontally via an interlayer insulating film (polyimide resin etc. is exemplified) A gate wiring and a source wiring are formed, and a thin film transistor is formed by being electrically connected to the gate wiring and the source wiring, and the thin film transistor is electrically connected to a region partitioned by the gate wiring and the source wiring. A pixel electrode is formed by connection, and a liquid crystal display device in which the dielectric constant of the gate insulating film interposed between the gate electrode forming the thin film transistor and the semiconductor active layer is larger than the dielectric constant of the interlayer insulating film (patent The organic insulating tape having a device hole for mounting a semiconductor integrated circuit element with improved reliability by preventing lead disconnection due to the thickness difference of the base film, and affixed to the organic insulating tape Arrangement of inner leads for semiconductor integrated circuit element bonding and output and input side outer leads A semiconductor integrated circuit having an aspect ratio of about 4 or more, which is arranged and connected to a metal foil layer on which a pattern is formed and the inner lead so that the longitudinal direction is parallel to the width direction of the organic insulating tape Many types of polyimide resins and films have been proposed for liquid crystal driver tape carrier packages having circuit elements (see Patent Document 6) and insulating substrates for various elements of these display devices.

Japanese Patent Laid-Open No. 10-319440 Japanese Patent Laid-Open No. 10-048610 JP 2002-277894 A

A polyimide resin or a polyimide film is used as an insulating substrate for an element in a conventionally known display device, but any polyimide resin or polyimide film can sufficiently satisfy environmental durability, particularly heat resistance, particularly high temperature. No one has been known to maintain durability against deformation in the plane direction.
An object of the present invention is to provide a small display device capable of high-definition display and having high production yield and excellent environmental durability.

As a result of intensive studies, the present inventors have obtained a high yield by using a printed wiring board in which a polymer film satisfying specific physical properties is used as an insulating substrate, particularly in a small display device having a diagonal size of 3 inches or less. The present inventors have found that high-definition image display can be satisfied and have reached the present invention.
That is, this invention consists of the following structures.
1. In a small display device in which a display element having a diagonal of 3 inches or less and a drive circuit for driving the element are connected to each other by the same printed wiring board, the insulating substrate of the printed wiring board has a curl degree at 300 ° C. A display device characterized by being a polyimide film of 10% or less.
2. 2. The display device according to 1 above, wherein the display element is a liquid crystal display element.
3. 2. The display device according to 1 above, wherein the display element is at least one selected from TN liquid crystal, STN liquid crystal, ferroelectric liquid crystal, guest-host liquid crystal, and cholesteric liquid crystal.
4). The display element is any of an EL display element, an electrophoretic display element, an electrochromic display element, a redox display element, a rotating sphere or rotating cylindrical display element, and a display element having a display format by moving a dry powder. 2. The display device according to 1 above, which is one or more display elements selected from the above.
5. Polyimide film having a linear expansion coefficient of 2 to 15 ppm / ° C. mainly composed of polyimide benzoxazole obtained by reacting an aromatic diamine having an benzoxazole structure with an aromatic tetracarboxylic acid anhydride. The display device according to any one of 1 to 4 above.
6). The insulating substrate has a plane orientation coefficient of 0.75 or more, which is mainly composed of polyimide benzoxazole obtained by reacting an aromatic diamine having a benzoxazole structure and an aromatic tetracarboxylic anhydride, The display device according to any one of 1 to 5, which is a polyimide film having an elastic modulus of 5 GPa or more and a tensile breaking strength of 300 MPa or more.

  In a small display device in which a display element having a diagonal size of 3 inches or less and a driving circuit for driving the element of the present invention are connected to each other by the same printed wiring board, the insulating base material of the printed wiring board is 300 ° C. In a display device characterized by being a polyimide film having a curl degree of 10% or less, a film as an insulating base material satisfying physical properties of a specific structure used for the printed wiring board is a circuit pattern manufacturing process, particularly In the process of manufacturing circuit patterns for small display devices with a size of 3 inches or less, it has sufficient flatness and dimensional stability through mechanical, thermal, and chemical stresses, and also has a driver IC for the printed circuit board. Good dimensional accuracy and flatness can be maintained even under mechanical and thermal stresses during mounting. With such an effect, it is possible to provide a small-sized image display device that can mount a driver IC with high yield even in a small-size display device capable of displaying an extremely high-definition image and that has high reliability and durability. .

The film as the insulating substrate in the present invention is not particularly limited as long as the curl degree at 300 ° C. is 10% or less, and aromatic diamines for obtaining the polyimide film and aromatic The reaction with tetracarboxylic acids is carried out by subjecting aromatic diamines and aromatic tetracarboxylic acids (anhydrides) to a (ring-opening) polyaddition reaction in a solvent to obtain a polyamic acid solution as a polyimide precursor. Subsequently, a precursor film (green film) is formed from this polyamic acid solution, followed by drying, heat treatment, and dehydration condensation (imidization).
Hereinafter, the polyimide film will be described in detail.
Although the polyimide film in this invention is not specifically limited, The combination of the following aromatic diamine and aromatic tetracarboxylic acid (anhydride) is mentioned as a preferable example.
A. A combination of an aromatic diamine having a benzoxazole structure and an aromatic tetracarboxylic acid.
B. A combination of an aromatic diamine having a diaminodiphenyl ether skeleton and an aromatic tetracarboxylic acid having a pyromellitic acid skeleton.
C. A combination of an aromatic diamine having a phenylenediamine skeleton and an aromatic tetracarboxylic acid having a biphenyltetracarboxylic acid skeleton.
D. A combination of one or more of the above ABCs.
Used in a polyimide benzoxazole film mainly composed of polyimide benzoxazole obtained by reacting an aromatic diamine having a benzoxazole structure that can be particularly preferably used in the present invention and an aromatic tetracarboxylic acid anhydride, Examples of aromatic diamines having a benzoxazole structure include the following compounds.

Among these, amino (aminophenyl) benzoxazole isomers are preferable from the viewpoint of ease of synthesis. Here, “each isomer” refers to each isomer in which two amino groups of amino (aminophenyl) benzoxazole are determined according to the coordination position (eg, the above “formula 1” to “formula 4”). Each compound described in the above. These diamines may be used alone or in combination of two or more.
In the present invention, it is preferable to use 70 mol% or more of the aromatic diamine having the benzoxazole structure.

The present invention is not limited to the above items, and the following aromatic diamines may be used. Preferably, the diamines do not have the benzoxazole structure exemplified below as long as the total aromatic diamine is less than 30 mol%. Is a polyimide film using one or two or more in combination.
Examples of such diamines include 4,4′-bis (3-aminophenoxy) biphenyl, bis [4- (3-aminophenoxy) phenyl] ketone, and bis [4- (3-aminophenoxy) phenyl]. Sulfide, bis [4- (3-aminophenoxy) phenyl] sulfone, 2,2-bis [4- (3-aminophenoxy) phenyl] propane, 2,2-bis [4- (3-aminophenoxy) phenyl] -1,1,1,3,3,3-hexafluoropropane, m-phenylenediamine, o-phenylenediamine, p-phenylenediamine, m-aminobenzylamine, p-aminobenzylamine,

3,3'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, 4,4'-diaminodiphenyl ether, 3,3'-diaminodiphenyl sulfide, 3,3'-diaminodiphenyl sulfoxide, 3,4'-diaminodiphenyl sulfoxide 4,4'-diaminodiphenyl sulfoxide, 3,3'-diaminodiphenyl sulfone, 3,4'-diaminodiphenyl sulfone, 4,4'-diaminodiphenyl sulfone, 3,3'-diaminobenzophenone, 3,4'- Diaminobenzophenone, 4,4′-diaminobenzophenone, 3,3′-diaminodiphenylmethane, 3,4′-diaminodiphenylmethane, 4,4′-diaminodiphenylmethane, bis [4- (4-aminophenoxy) phenyl] methane, 1 , 1-Bi [4- (4-aminophenoxy) phenyl] ethane, 1,2-bis [4- (4-aminophenoxy) phenyl] ethane, 1,1-bis [4- (4-aminophenoxy) phenyl] propane, 1 , 2-bis [4- (4-aminophenoxy) phenyl] propane, 1,3-bis [4- (4-aminophenoxy) phenyl] propane, 2,2-bis [4- (4-aminophenoxy) phenyl ]propane,

1,1-bis [4- (4-aminophenoxy) phenyl] butane, 1,3-bis [4- (4-aminophenoxy) phenyl] butane, 1,4-bis [4- (4-aminophenoxy) Phenyl] butane, 2,2-bis [4- (4-aminophenoxy) phenyl] butane, 2,3-bis [4- (4-aminophenoxy) phenyl] butane, 2- [4- (4-aminophenoxy) Phenyl] -2- [4- (4-aminophenoxy) -3-methylphenyl] propane, 2,2-bis [4- (4-aminophenoxy) -3-methylphenyl] propane, 2- [4- ( 4-aminophenoxy) phenyl] -2- [4- (4-aminophenoxy) -3,5-dimethylphenyl] propane, 2,2-bis [4- (4-aminophenoxy) -3,5-dimethylphen Le] propane, 2,2-bis [4- (4-aminophenoxy) phenyl] -1,1,1,3,3,3-hexafluoropropane,

1,4-bis (3-aminophenoxy) benzene, 1,3-bis (3-aminophenoxy) benzene, 1,4-bis (4-aminophenoxy) benzene, 4,4′-bis (4-aminophenoxy) ) Biphenyl, bis [4- (4-aminophenoxy) phenyl] ketone, bis [4- (4-aminophenoxy) phenyl] sulfide, bis [4- (4-aminophenoxy) phenyl] sulfoxide, bis [4- ( 4-aminophenoxy) phenyl] sulfone, bis [4- (3-aminophenoxy) phenyl] ether, bis [4- (4-aminophenoxy) phenyl] ether, 1,3-bis [4- (4-aminophenoxy) ) Benzoyl] benzene, 1,3-bis [4- (3-aminophenoxy) benzoyl] benzene, 1,4-bis [4- (3 Aminophenoxy) benzoyl] benzene, 4,4′-bis [(3-aminophenoxy) benzoyl] benzene, 1,1-bis [4- (3-aminophenoxy) phenyl] propane, 1,3-bis [4- (3-aminophenoxy) phenyl] propane, 3,4'-diaminodiphenyl sulfide,

2,2-bis [3- (3-aminophenoxy) phenyl] -1,1,1,3,3,3-hexafluoropropane, bis [4- (3-aminophenoxy) phenyl] methane, 1,1 -Bis [4- (3-aminophenoxy) phenyl] ethane, 1,2-bis [4- (3-aminophenoxy) phenyl] ethane, bis [4- (3-aminophenoxy) phenyl] sulfoxide, 4,4 '-Bis [3- (4-aminophenoxy) benzoyl] diphenyl ether, 4,4'-bis [3- (3-aminophenoxy) benzoyl] diphenyl ether, 4,4'-bis [4- (4-amino-α) , Α-dimethylbenzyl) phenoxy] benzophenone, 4,4′-bis [4- (4-amino-α, α-dimethylbenzyl) phenoxy] diphenylsulfone, bis 4- {4- (4-aminophenoxy) phenoxy} phenyl] sulfone, 1,4-bis [4- (4-aminophenoxy) phenoxy-α, α-dimethylbenzyl] benzene, 1,3-bis [4- (4-aminophenoxy) phenoxy-α, α-dimethylbenzyl] benzene, 1,3-bis [4- (4-amino-6-trifluoromethylphenoxy) -α, α-dimethylbenzyl] benzene, 1,3 -Bis [4- (4-amino-6-fluorophenoxy) -α, α-dimethylbenzyl] benzene, 1,3-bis [4- (4-amino-6-methylphenoxy) -α, α-dimethylbenzyl Benzene, 1,3-bis [4- (4-amino-6-cyanophenoxy) -α, α-dimethylbenzyl] benzene,

3,3′-diamino-4,4′-diphenoxybenzophenone, 4,4′-diamino-5,5′-diphenoxybenzophenone, 3,4′-diamino-4,5′-diphenoxybenzophenone, 3, 3'-diamino-4-phenoxybenzophenone, 4,4'-diamino-5-phenoxybenzophenone, 3,4'-diamino-4-phenoxybenzophenone, 3,4'-diamino-5'-phenoxybenzophenone, 3,3 '-Diamino-4,4'-dibiphenoxybenzophenone, 4,4'-diamino-5,5'-dibiphenoxybenzophenone, 3,4'-diamino-4,5'-dibiphenoxybenzophenone, 3,3'- Diamino-4-biphenoxybenzophenone, 4,4′-diamino-5-biphenoxybenzophenone, 3,4 -Diamino-4-biphenoxybenzophenone, 3,4'-diamino-5'-biphenoxybenzophenone, 1,3-bis (3-amino-4-phenoxybenzoyl) benzene, 1,4-bis (3-amino- 4-phenoxybenzoyl) benzene, 1,3-bis (4-amino-5-phenoxybenzoyl) benzene, 1,4-bis (4-amino-5-phenoxybenzoyl) benzene, 1,3-bis (3-amino) -4-biphenoxybenzoyl) benzene, 1,4-bis (3-amino-4-biphenoxybenzoyl) benzene, 1,3-bis (4-amino-5-biphenoxybenzoyl) benzene, 1,4-bis (4-Amino-5-biphenoxybenzoyl) benzene, 2,6-bis [4- (4-amino-α, α-dimethylbenzyl) pheno Si] benzonitrile and some or all of the hydrogen atoms on the aromatic ring in the aromatic diamine are halogen atoms, alkyl groups having 1 to 3 carbon atoms or alkoxyl groups, cyano groups, or alkyl groups or alkoxyl group hydrogen atoms. Examples thereof include aromatic diamines substituted with a halogenated alkyl group having 1 to 3 carbon atoms, partially or entirely substituted with a halogen atom, or an alkoxyl group.

  The aromatic tetracarboxylic acids used in the present invention are, for example, aromatic tetracarboxylic anhydrides. Specific examples of the aromatic tetracarboxylic acid anhydrides include the following.

These tetracarboxylic dianhydrides may be used alone or in combination of two or more.
In the present invention, one or two or more non-aromatic tetracarboxylic dianhydrides exemplified below may be used in combination as long as they are less than 30 mol% of the total tetracarboxylic dianhydrides. Examples of such tetracarboxylic acid anhydrides include butane-1,2,3,4-tetracarboxylic dianhydride, pentane-1,2,4,5-tetracarboxylic dianhydride, and cyclobutanetetracarboxylic acid. Acid dianhydride, cyclopentane-1,2,3,4-tetracarboxylic dianhydride, cyclohexane-1,2,4,5-tetracarboxylic dianhydride, cyclohex-1-ene-2,3 5,6-tetracarboxylic dianhydride, 3-ethylcyclohex-1-ene-3- (1,2), 5,6-tetracarboxylic dianhydride, 1-methyl-3-ethylcyclohexane-3 -(1,2), 5,6-tetracarboxylic dianhydride, 1-methyl-3-ethylcyclohex-1-ene-3- (1,2), 5,6-tetracarboxylic dianhydride 1-ethylcyclohexane -(1,2), 3,4-tetracarboxylic dianhydride, 1-propylcyclohexane-1- (2,3), 3,4-tetracarboxylic dianhydride, 1,3-dipropylcyclohexane- 1- (2,3), 3- (2,3) -tetracarboxylic dianhydride, dicyclohexyl-3,4,3 ′, 4′-tetracarboxylic dianhydride,

Bicyclo [2.2.1] heptane-2,3,5,6-tetracarboxylic dianhydride, 1-propylcyclohexane-1- (2,3), 3,4-tetracarboxylic dianhydride, 1 , 3-Dipropylcyclohexane-1- (2,3), 3- (2,3) -tetracarboxylic dianhydride, dicyclohexyl-3,4,3 ′, 4′-tetracarboxylic dianhydride, bicyclo [2.2.1] Heptane-2,3,5,6-tetracarboxylic dianhydride, bicyclo [2.2.2] octane-2,3,5,6-tetracarboxylic dianhydride, bicyclo [2.2.2] Oct-7-ene-2,3,5,6-tetracarboxylic dianhydride and the like. These tetracarboxylic dianhydrides may be used alone or in combination of two or more.

  The solvent used when polyamic acid is obtained by polycondensation (polymerization) of the aromatic diamine and aromatic tetracarboxylic acid (anhydride) dissolves both the raw material monomer and the resulting polyamic acid. Although it will not specifically limit if it carries out, A polar organic solvent is preferable, for example, N-methyl-2-pyrrolidone, N-acetyl-2-pyrrolidone, N, N-dimethylformamide, N, N-diethylformamide, N, Examples thereof include N-dimethylacetamide, dimethyl sulfoxide, hexamethylphosphoric amide, ethyl cellosolve acetate, diethylene glycol dimethyl ether, sulfolane, and halogenated phenols. These solvents can be used alone or in combination. The amount of the solvent used may be an amount sufficient to dissolve the monomer as a raw material. As a specific amount used, the mass of the monomer in the solution in which the monomer is dissolved is usually 5 to 40% by mass, The amount is preferably 10 to 30% by mass.

Conventionally known conditions may be applied for the polymerization reaction for obtaining the polyamic acid (hereinafter also simply referred to as “polymerization reaction”). As a specific example, in a temperature range of 0 to 80 ° C., 10 Stirring and / or mixing continuously for 30 minutes. If necessary, the polymerization reaction may be divided or the temperature may be increased or decreased. In this case, the order of adding both monomers is not particularly limited, but it is preferable to add aromatic tetracarboxylic acid anhydrides to the solution of aromatic diamines. The mass of the polyamic acid in the polyamic acid solution obtained by the polymerization reaction is preferably 5 to 40% by mass, more preferably 10 to 30% by mass, and the viscosity of the solution is measured with a Brookfield viscometer (25 ° C.). From the viewpoint of the stability of liquid feeding, it is preferably 10 to 2000 Pa · s, and more preferably 100 to 1000 Pa · s.
The reduced viscosity (ηsp / C) of the polyamic acid in the present invention is not particularly limited, but is preferably 3.0 dl / g or more, more preferably 4.0 dl / g or more. By setting these reduced viscosities, It becomes easy to control the linear expansion coefficient of the obtained polyimide benzoxazole from −10 to +16 (ppm / ° C.).

  Vacuum defoaming during the polymerization reaction is effective for producing a high-quality polyamic acid organic solvent solution. Moreover, you may perform superposition | polymerization by adding a small amount of terminal blockers to aromatic diamines before a polymerization reaction. Examples of the end capping agent include compounds having a carbon-carbon double bond such as maleic anhydride. The amount of maleic anhydride used is preferably 0.001 to 1.0 mol per mol of aromatic diamine.

  As an imidization method by high-temperature treatment, a conventionally known imidation reaction can be appropriately used. For example, using a polyamic acid solution that does not contain a ring-closing catalyst or a dehydrating agent, the imidization reaction proceeds by subjecting it to a heat treatment (so-called thermal ring-closing method), or a polycyclic acid solution containing a ring-closing catalyst and a dehydrating agent In particular, a chemical ring closing method in which an imidization reaction is performed by the action of the above ring closing catalyst and a dehydrating agent can be given.

  100-500 degreeC is illustrated as a heating maximum temperature of a thermal ring closure method, Preferably it is 200-480 degreeC. When the maximum heating temperature is lower than this range, it is difficult to close the ring sufficiently, and when it is higher than this range, the deterioration proceeds and the composite tends to become brittle. A more preferable embodiment includes a two-stage heat treatment in which treatment is performed at 150 to 250 ° C. for 3 to 20 minutes and then treatment at 350 to 500 ° C. for 3 to 20 minutes.

In the chemical ring closure method, imidization can be completely performed by heating after forming a precursor complex having self-supporting property by partially proceeding imidization reaction of the polyamic acid solution.
In this case, the condition for partially proceeding with the imidization reaction is preferably a heat treatment for 3 to 20 minutes at 100 to 200 ° C., and the condition for allowing the imidization reaction to be completely performed is preferably 200 to 400 ° C. For 3 to 20 minutes.

The timing for adding the ring-closing catalyst to the polyamic acid solution is not particularly limited, and may be added in advance before the polymerization reaction for obtaining the polyamic acid. Specific examples of the ring-closing catalyst include aliphatic tertiary amines such as trimethylamine and triethylamine, and heterocyclic tertiary amines such as isoquinoline, pyridine, and betapicoline. Among them, heterocyclic tertiary amines are mentioned. At least one amine selected from is preferred. Although the usage-amount of a ring-closing catalyst with respect to 1 mol of polyamic acids does not have limitation in particular, Preferably it is 0.5-8 mol.
The timing of adding the dehydrating agent to the polyamic acid solution is not particularly limited, and may be added in advance before the polymerization reaction for obtaining the polyamic acid. Specific examples of the dehydrating agent include aliphatic carboxylic acid anhydrides such as acetic anhydride, propionic anhydride, butyric anhydride, and aromatic carboxylic acid anhydrides such as benzoic anhydride. Among them, acetic anhydride, benzoic anhydride, etc. Acids or mixtures thereof are preferred. Moreover, the usage-amount of the dehydrating agent with respect to 1 mol of polyamic acids is not particularly limited, but is preferably 0.1 to 4 mol. When a dehydrating agent is used, a gelation retarder such as acetylacetone may be used in combination.

The film as the insulating base material of the printed wiring board in the present invention is a film having a curl degree at 300 ° C. of 10% or less, and the curl degree of the film at 300 ° C. (hereinafter also referred to as the curl degree of the film at 300 ° C.). Means the degree of deformation in the thickness direction with respect to the surface direction of the film after performing a predetermined heat treatment. Specifically, as shown in FIG. 1, a test piece of 50 mm × 50 mm is obtained at 300 ° C. After the hot air treatment for 10 minutes, the test piece is left on the plane in a concave shape, and the average value of the distances from the four corner planes (h1, h2, h3, h4: unit mm) is the curl amount (mm). , A value expressed as a percentage (%) of the curl amount with respect to the distance (35.36 mm) from each vertex to the center of the test piece.
Samples were sampled at a total of 10 points, with 2 points in the width direction (1/3 and 2/3 of the length) as the center points of the test piece at a 1/5 length pitch with respect to the total length of the film. The measured value is an average value of 10 points.
However, if there is not enough film to sample 10 points, sample as much as possible.
Specifically, it is calculated by the following formula.
Curling amount (mm) = (h1 + h2 + h3 + h4) / 4
Curling degree (%) = 100 × (curl amount) /35.36

In the present invention, the curl degree of the film at 400 ° C. is measured in the same manner except that the heat treatment at the time of measurement at 300 ° C. is treated with hot air at 400 ° C. for 10 minutes.
In the above, the degree of curl in the state of heating at normal temperature and without heating is evaluated as warpage.
The curl degree at 300 ° C. in the present invention is more preferably 8% or less, still more preferably 5% or less, and further a film having a curl degree at 400 ° C. of 10% or less is preferred.
The film in the present invention is preferably a polyimide film, more preferably a polyimide benzoxazole obtained by reacting an aromatic diamine having a benzoxazole structure with an aromatic tetracarboxylic acid anhydride as a main component. A polyimide film having a linear expansion coefficient of 2 to 15 ppm / ° C., and particularly preferably a polyimide benzoxazole obtained by reacting an aromatic diamine having a benzoxazole structure with an aromatic tetracarboxylic anhydride. The polyimide film has a plane orientation coefficient of 0.75 or more, a tensile modulus of 5 GPa or more, and a tensile strength at break of 300 MPa or more. Because the polyimide film has a linear expansion coefficient of 2 to 15 ppm / ° C., the difference between the linear expansion coefficients of the metal thin film layer such as copper and the like formed on the film is small and peeling occurs due to heating and cooling. hard. Further, when the polyimide film has a plane orientation coefficient of 0.75 or more, a tensile modulus of elasticity of 5 GPa or more, and a tensile breaking strength of 300 MPa or more, a further effect of improving heat resistance can be obtained.

Although the thickness of the polyimide film of the present invention is not particularly limited, it is usually 1 to 150 μm, preferably 5 to 50 μm, considering that it is used for an insulating substrate. This thickness can be easily controlled by the coating amount when a film raw material solution such as a polyamic acid solution is applied to the support and the raw material concentration in the film raw material solution such as a polyamic acid solution.
In the polyimide film of the present invention, it is preferable to add a lubricant to the polyimide film to give fine irregularities on the film surface to improve the slipping property of the film.
As the lubricant, inorganic or organic fine particles having an average particle diameter of about 0.03 μm to 3 μm can be used. Specific examples include titanium oxide, alumina, silica, calcium carbonate, calcium phosphate, calcium hydrogen phosphate, calcium pyrophosphate, Examples include magnesium oxide, calcium oxide, and clay minerals.
The polyimide film of the present invention may be an unstretched film or a stretched film. Here, the unstretched film is a mechanical external force in the direction of film expansion by tenter stretching, roll stretching, inflation stretching, or the like. Refers to a film obtained without intentionally adding.

EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated more concretely, this invention is not limited by a following example. The physical property evaluation methods in the following examples are as follows except for the above.
Abbreviations of compounds used in Examples and the like are described below.
PMDA: pyromellitic dianhydride TMHQ: P-phenylenebis (trimellitic acid monoester anhydride)
ODA: 4,4′-diaminodiphenyl ether P-PDA: paraphenylenediamine BPDA: 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride DMF: dimethylformamide DMAC: dimethylacetamide AA: acetic anhydride IQ: isoquinoline Abbreviation GF indicates a polyimide precursor film (green film), and abbreviation IF indicates a polyimide film.

1. Reduced viscosity of polyamic acid (ηsp / C)
A solution dissolved in N-methyl-2-pyrrolidone so that the polymer concentration was 0.2 g / dl was measured at 30 ° C. using an Ubbelohde type viscosity tube.
2. The thickness of the polyimide benzoxazole film was measured using a micrometer (Finereuf, Millitron 1254D).
3. Specimen obtained by cutting a polyimide film to be measured into a strip of 100 mm × 10 mm in the flow direction (MD direction) and the width direction (TD direction), respectively. It was. Using a tensile tester (manufactured by Shimadzu Corporation, Autograph (trade name), model name AG-5000A) under the conditions of a tensile speed of 50 mm / min and a distance between chucks of 40 mm, the tensile modulus of elasticity in each of the MD direction and TD direction, Tensile rupture strength and tensile rupture elongation were measured.

4). Linear expansion coefficient (CTE) of polyimide film
For the polyimide film to be measured, the stretch rate in the MD direction and the TD direction is measured under the following conditions, and the stretch rate / temperature at intervals of 30 ° C. to 45 ° C., 45 ° C. to 60 ° C.,. This measurement was performed up to 300 ° C., and the average value of all measured values was calculated as CTE. The meanings of the MD direction and the TD direction are the same as in the measurement of “3.” above.
Device name: TMA4000S manufactured by MAC Science
Sample length; 20mm
Sample width: 2 mm
Temperature rise start temperature: 25 ° C
Temperature rising end temperature: 400 ° C
Temperature increase rate: 5 ° C / min
Atmosphere: Argon

5. Surface orientation coefficient of polyimide film A polyimide film to be measured was mounted on a measurement jig, and X-ray diffraction measurement was performed under the following conditions to obtain a pole figure about a diffraction peak appearing near 2θ = 21.8 °. .
Device name: RINT 2100PC manufactured by Rigaku Co., Ltd., multipurpose sample base Voltage, current value; 40 kV, 40 mA
Measurement method; reflection method and transmission method scanning range; reflection method α; 15 to 90 ° / 2.5 ° interval
β: 0 to 360 ° / 5 ° interval
Reflection method α: 0-15 ° / 2.5 ° interval
β: 0-360 ° / 5 ° interval slit; DS 0.1 mm, SS 7 mm, RS 7 mm,
Vertical divergence limit slit 1.2mm
Scanning speed: Continuous (360 ° / min)
Detector: Scintillation counter FIG. 3 schematically shows this pole figure. In the figure, peak half widths (HMD and HTD) were determined from diffraction intensity profiles at two broken lines, and the average value of HMD and HTD was defined as Ha (unit: °). The peak half-value width was obtained using a Rigaku analysis program. From the thus obtained Ha, the plane orientation coefficient of the polyimide film was calculated by the following equation.
Plane orientation coefficient = (180 °-Ha) ÷ 180 °

[Polymeric acid solution polymerization example 1]
(Preliminary dispersion of inorganic particles)
1.22 parts by mass of amorphous silica spherical particles Seahoster KE-P10 (manufactured by Nippon Shokubai Co., Ltd.), 420 parts by mass of N-methyl-2-pyrrolidone, the wetted part of the container, and the infusion pipe are austenitic stainless steel The mixture was placed in a container of SUS316L and stirred with a homogenizer T-25 basic (manufactured by IKA Labortechnik) at a rotation speed of 1000 rpm for 1 minute to obtain a preliminary dispersion. The average particle size in the preliminary dispersion was 0.11 μm.
(Preparation of polyamic acid solution)
A nitrogen inlet tube, a thermometer, a liquid contact part of a container equipped with a stirring rod, and a pipe for infusion were substituted with nitrogen in the reaction container made of austenitic stainless steel SUS316L, and then 223 parts by mass of 5-amino-2- ( p-Aminophenyl) benzoxazole was added. Next, 4000 parts by mass of N-methyl-2-pyrrolidone was added and completely dissolved, and then the preliminary dispersion obtained above was added with 420 parts by mass and 217 parts by mass of pyromellitic dianhydride. When the mixture was stirred at ° C. for 24 hours, a brown viscous polyamic acid solution A was obtained. The reduced viscosity (ηsp / C) was 3.8 dl / g.

[Polymeric acid solution polymerization example 2]
Nitrogen introduction tube, thermometer, vessel wetted part equipped with stirring rod, and infusion pipe were replaced with nitrogen in the reaction vessel of austenitic stainless steel SUS316L, and then 5-amino-2- (p-aminophenyl) ) After adding 223 parts by mass of benzoxazole and 4416 parts by mass of N, N-dimethylacetamide and completely dissolving them, Snowtex DMAC-ST30 (manufactured by Nissan Chemical Industries, Ltd.) 40 in which colloidal silica is dispersed in dimethylacetamide .5 parts by mass (including 8.1 parts by mass of silica) and 217 parts by mass of pyromellitic dianhydride are added and stirred at a reaction temperature of 25 ° C. for 24 hours to obtain a brown and viscous polyamide acid solution B. It was. Ηsp / C of this product was 4.0 dl / g.

[Polymeric acid solution polymerization example 3]
(Preliminary dispersion of inorganic particles)
7.6 parts by weight of amorphous silica spherical particle Seahoster KE-P10 (manufactured by Nippon Shokubai Co., Ltd.), 390 parts by weight of N-methyl-2-pyrrolidone, the liquid contact part of the container, and the infusion pipe are austenitic stainless steel SUS316L And stirred for 1 minute at a rotation speed of 1000 rpm with a homogenizer T-25 basic (manufactured by IKA Labortechnik) to obtain a preliminary dispersion.
(Preparation of polyamic acid solution)
The liquid contact part of the vessel equipped with a nitrogen introduction tube, a thermometer, a stirring rod, and the pipe for infusion were substituted with nitrogen in the reaction vessel made of austenitic stainless steel SUS316L, and then 200 parts by mass of diaminodiphenyl ether was added. Next, after 3800 parts by mass of N-methyl-2-pyrrolidone was added and completely dissolved, 390 parts by mass and 217 parts by mass of pyromellitic dianhydride were added to the preliminary dispersion obtained above. When the mixture was stirred at 0 ° C. for 5 hours, a brown viscous polyamic acid solution C was obtained. The reduced viscosity (ηsp / C) was 3.7 dl / g.

[Polymeric acid solution polymerization example 4]
(Preliminary dispersion of inorganic particles)
3.7 parts by mass of amorphous silica spherical particles Seahoster KE-P10 (manufactured by Nippon Shokubai Co., Ltd.), 420 parts by mass of N-methyl-2-pyrrolidone, and the infusion part are austenitic stainless steel SUS316L And stirred for 1 minute at a rotation speed of 1000 rpm with a homogenizer T-25 basic (manufactured by IKA Labortechnik) to obtain a preliminary dispersion.
(Preparation of polyamic acid solution)
The wetted part of the vessel equipped with a nitrogen introduction tube, a thermometer, and a stirring rod, and the infusion piping were substituted with nitrogen in the reaction vessel made of austenitic stainless steel SUS316L, and then 108 parts by mass of phenylenediamine was added. Next, after 3600 parts by mass of N-methyl-2-pyrrolidone was added and completely dissolved, 420 parts by mass and 292.5 parts by mass of diphenyltetracarboxylic dianhydride were added to the preliminary dispersion obtained above. When the mixture was stirred at 25 ° C. for 12 hours, a brown viscous polyamic acid solution D was obtained. The reduced viscosity (ηsp / C) was 4.5 dl / g.

[Production Examples 1 to 4 of polyimide film]
The polyamic acid solution obtained in Polymerization Examples 1 to 4 was coated on the non-lubricant surface of polyethylene terephthalate film A-4100 (manufactured by Toyobo Co., Ltd.) using a comma coater (gap: 650 μm, coating width). 1240 mm) and passed through a continuous drying furnace having four drying zones and dried under the following predetermined conditions.
Zone 1 Upper temperature 105 ° C, Lower temperature 110 ° C
Air volume 20 cubic m / min for both top and bottom Zone 2 Upper temperature 110 ° C, Lower temperature 110 ° C
Air volume 30 cubic m / min for both top and bottom Third zone Upper temperature 110 ° C, Lower temperature 110 ° C
Air volume 20 cubic m / min for both top and bottom Zone 4 Upper temperature 110 ° C, Lower temperature 110 ° C
Upper air volume 15 cubic m / min, lower air volume 20 cubic m / min The length of each zone is the same, and the total drying time is 15 minutes.
The air volume is the sum of the air volumes from the outlets for each zone.
The polyamic acid film that became self-supporting after drying was peeled off from the polyester film, and both ends were cut to obtain respective green films having a thickness of 39 μm and a width of 1200 mm.
The obtained green film was passed through a continuous heat treatment furnace purged with nitrogen while holding both ends with a pin tenter. As the second stage, two stages of heating were performed at 400 ° C. for 5 minutes to advance the imidization reaction. Then, it cooled to room temperature in 5 minutes, and the 25-micrometer-thick polyimide film which exhibits brown was obtained. Table 1 shows the characteristics of the obtained film. Shown in

[Production Example 5 of polyimide film]
A stainless steel belt obtained by polishing the polyamic acid solution obtained in Polymerization Example 2 to a thickness of 0.5 mm, a width of 750 mm, and a surface roughness of 0.005 μm was coated with a squeegee / belt gap of 680 μm, and three hot-air drying zones First zone Temperature: 105 ° C, Air volume: 10 cubic m / min Drying time: 4 minutes Second zone Temperature: 115 ° C, Air volume: 20 cubic m / min Drying time: 4 minutes Third zone Temperature: 110 ° C., temperature: 25 cubic m / min Drying time: dried for 4 minutes. The polyamic acid film which became self-supporting after drying was peeled from the stainless steel belt to obtain a green film having a thickness of 39 μm.
The obtained green film was passed through a continuous heat treatment furnace purged with nitrogen, the first stage was heated at 180 ° C. for 3 minutes, and the heating rate was 4 ° C./second, and the second stage was at 460 ° C. for 2 minutes. The imidation reaction was allowed to proceed by applying two stages of heating under the conditions described above. Then, it cooled to room temperature in 5 minutes, and the 25-micrometer-thick polyimide film which exhibits brown was obtained. Table 1 shows the characteristics of the obtained film. Shown in

[Production Examples 6 to 9 of polyimide film]
A stainless steel belt obtained by polishing the polyamic acid solution obtained in Polymerization Examples 1 to 4 to a thickness of 0.5 mm, a width of 750 mm, and a surface roughness of 0.005 μm was coated with a squeegee / belt gap of 680 μm, and three hot-air types First zone Temperature: 110 ° C., Air volume: 10 cubic m / min Drying time: 2 minutes Second zone Temperature: 130 ° C., Air volume: 25 cubic m / min Drying time: 2 minutes 3 zones Temperature: 135 ° C., temperature: 25 cubic m / min Drying time: dried for 2 minutes. The polyamic acid film which became self-supporting after drying was peeled from the stainless steel belt to obtain a green film having a thickness of 36 μm.
The obtained green film was passed through a continuous heat treatment furnace purged with nitrogen, the first stage was heated at 180 ° C. for 3 minutes, and the heating rate was 4 ° C./second, and the second stage was at 460 ° C. for 2 minutes. The imidation reaction was allowed to proceed by applying two stages of heating under the conditions described above. Then, it cooled to room temperature in 5 minutes, and the 25-micrometer-thick polyimide film which exhibits brown was obtained. Table 1 shows the characteristics of the obtained film. Shown in

「反り」は、カール度測定時の常温（加熱なし）で評価した値である。

“Warpage” is a value evaluated at normal temperature (no heating) at the time of curl degree measurement.

Using the polyimide film obtained in each of the above Examples and Comparative Examples as an insulating base material, a double-sided tape carrier type semiconductor package having a minimum wiring pitch of 40 μm or less was prepared as described below.
A display device using a microcapsule type electrophoretic display panel (element) that receives a drive signal through each of the obtained tape carrier type semiconductor packages was prototyped, and the display device using each film was evaluated.
<Production of tape carrier type semiconductor package and connection with display element>
The outline of the production of the tape carrier type semiconductor package and the connection with the display panel (element) will be described below.

Each film was slit to a roll size of 50 cm width, and plasma treatment was performed under the following conditions in a continuous vacuum apparatus having a winding / unwinding portion from the roll. The plasma treatment conditions were in oxygen gas, with a frequency of 13.56 MHz. The conditions were an output of 100 W and a gas pressure of 0.8 Pa, the temperature during the treatment was 25 ° C., and the treatment time was 5 minutes. Next, using a nickel-chromium (3 mass%) alloy target under conditions of a frequency of 13.56 MHz, an output of 400 W, a gas pressure of 0.8 Pa, and a thickness of 10 mm / sec by RF sputtering in an argon atmosphere. A 75-mm nickel-chromium alloy film (underlayer) was formed, and then copper was vapor-deposited at a rate of 150 kg / second to form a 0.4 μm-thick copper thin film and wound in a vacuum.
The wound film roll was set again in a continuous vacuum apparatus, and a metal film was formed on the back surface of the film in the same manner by plasma treatment and sputtering.
Holes are drilled in the specified position of the resulting double-sided metallized film, and the treatment is performed in the order of washing, desmear, cleaning, catalyst application, activation, electroless nickel-phosphorus plating, electroplating, and through-hole connection is made. Here, the thickness of the electroplating is 8 μm. Furthermore, according to a standard method, a 7 μm-thick resist is formed using a liquid resist on both sides, etched with a ferric chloride-based etchant, the resist is removed, and an unnecessary conductive layer is removed with a nickel remover. Finally, electroless tin plating was performed on the surface to form a double-sided COF tape carrier type package pattern (printed wiring board) having fine lines with a line spacing / line width of 18 μm / 22 μm and a conductor thickness of 8 μm.

A driving semiconductor chip was mounted face-down on the obtained double-sided COF tape carrier package substrate. The connection in this case is a gold-tin eutectic connection. Semiconductor chip mounting methods include not only gold-tin eutectic connection but also gold-gold thermocompression bonding, ultrasonic connection, anisotropic conductive film, NCP, and the like, and the connection method may be appropriately selected and used.
Further, in the present invention, as other mounting parts, chip resistors, capacitors, package ICs, coils, connectors, and the like are connected by reflow soldering to produce each tape carrier type semiconductor package.
Each tape carrier type semiconductor package was mounted on a monochrome microcapsule type electrophoretic display panel having a diagonal size of 3 inches and vertical and horizontal pixels of 640 × 480 dots. An anisotropic conductive film is attached to the terminal portion of the display panel, aligned with each tape carrier type semiconductor package substrate, and maintained at the normal temperature or a temperature at which the anisotropic conductive film does not cure. After that, by adding the curing temperature condition of the resin of the anisotropic conductive film and the load condition that the connecting particles of the anisotropic conductive film are crushed and contacted, the display panel and each tape carrier type semiconductor package are connected, A display device using a tape carrier type semiconductor package was produced. In addition, temporary attachment can also be abbreviate | omitted.

<Evaluation of display devices>
The connection reliability and heat cycle durability of the obtained display device (display panel) were evaluated.
Connection reliability: A drive signal was given to each display panel, a test pattern was displayed, and the presence or absence of connection failure was inspected. The result is shown in Table 2 as the connection failure rate.
A non-defective display panel that was not defective in the inspection was subjected to a temperature cycle test of −25 ° C. to + 60 ° C. (30 minutes each) for 100 cycles, and a test pattern was displayed on the display device after the test. The presence or absence was inspected, and the result is shown in Table 2 as the connection failure rate after the heat cycle (HC).

  Each tape carrier type semiconductor package was mounted on a 2.5-inch diagonal low-temperature polysilicon type display panel using an anisotropic conductive paste and evaluated in the same manner. Table 3 shows the results. Shown in

  As described above, the insulating substrate of the printed wiring board used in the small display device having a diagonal size of 3 inches or less according to the present invention is a film having a curl degree of 10% or less at 300 ° C., particularly a fragrance having a benzoxazole structure. A display device using a drive unit, which is a polyimide film having a linear expansion coefficient of 2 to 15 ppm / ° C. whose main component is polyimide benzoxazole obtained by reacting an aromatic diamine and an aromatic tetracarboxylic acid anhydride. Specifically, small display units such as small televisions, handheld televisions, automobile televisions, mobile personal computers, portable display devices, display units for audio equipment, display units for portable music players, in-vehicle amusements Device display units, small display units of portable communication devices, for example mobile phones, mobile vehicles such as automobiles, ships Electronic dictionaries such as small (screen) display parts in cockpits such as aircraft, small display parts of car navigation systems, guidance displays in public transportation, advertisements, public relations media, watches, head mounted displays, video cameras, digital still cameras, PDA, electronic notebook, GPS, portable game machine, portable karaoke machine, toy display, digital and silver salt camera display and status display / control unit small (screen) display, computer display and TV monitor Status display / control unit small display unit, watches, watches other than wristwatches using electronic display devices, remote control display units such as various home appliances, refrigerator, washing machine, microwave oven, electric kettle, jarpot, Dishwasher, electric refrigerator, cooking heater, ventilation fan, electric hot water , Natural refrigerant heat pump water heater, household electric well pump, air purifier, electric washing machine, washing machine (fully automatic, two-tank type), washing dryer, electric vacuum cleaner, hot water washing toilet seat, electric razor, household Garbage disposal machines, display units for home appliances such as coolers, display units for electric lighting equipment, video recorders, DVD recorders, HD recorders, stereos, home theater systems, small screen displays for AV equipment such as radios, copiers, Small display units for office equipment such as printers, fax machines, telephones, small display units such as printers, CD drives, FD drives, MO drives, DVD drives, hard disks, IC cards, magnetic cards, credit cards, memory card readers / writers, Computer peripherals such as modems, routers, hubs, and computers Small display part of the main body, door phone, fire alarm system, gas detection, security system etc. housing, building equipment display part, health meter, blood pressure measuring instrument, electric massage instrument display etc. health promotion equipment display part, civil engineering machinery , Mining machinery, chemical machinery and storage tanks, pulp and paper machinery, plastic processing machinery, pumps, compressors and blowers, hydraulic machinery and pneumatic equipment, power transmission equipment, agricultural machinery and wood processing machinery, metal machine tools, metal Processing machinery and casting equipment, food processing machinery, packaging machinery and packing machinery, sewing machines and textile machinery, refrigerators and refrigerator applied products, vending machines, automatic ticket gates / automatic entrance machines, rotating electrical machinery, stationary electrical machinery and equipment , Switching control equipment, semiconductor-related, home appliance-related, production equipment in various industries such as automobiles, small display parts of machine tools, electronics In equipment and facilities used in exchanges, digital transmission equipment, small screen displays in communication equipment, terminal equipment such as automatic teller machines (including payment machines), electrical measuring instruments and electronic application equipment, measuring equipment, etc. Durability and precision can be applied to small screen displays and display devices.

It is the schematic diagram which showed the measuring method of the curl degree of a film. (A) is a top view, (b) is a sectional view indicated by aa in (a) before hot air treatment, and (c) is indicated by aa in (a) after hot air treatment. It is sectional drawing.

It is the figure explaining the outline of the manufacturing process of a tape carrier type semiconductor package. The IC chip indicates a semiconductor chip.

It is the figure which represented typically the X-ray-diffraction pole figure of the polyimide film.

The outline of the connection of a display panel and a tape carrier type semiconductor package is shown.

Explanation of symbols

(References in FIG. 1 below)
1. 1. (Polyimide) film test piece Alumina / Ceramic plate (Reference in Fig. 2)
1. 1. Base film Copper foil Through-hole plated copper 4. 4. Etching resist Solder resist IC chip 7. Sealing material (reference numeral in FIG. 4 below)
1. 1. Microcapsule type electrophoretic display panel Microcapsule 3. Tape base material 4. 4. Chip component Connector 6. 6. Semiconductor IC chip for driving Anisotropic conductive film 8. ITO wiring

Claims (6)

  In a small display device in which a display element having a diagonal of 3 inches or less and a drive circuit for driving the element are connected to each other by the same printed wiring board, the insulating substrate of the printed wiring board has a curl degree at 300 ° C. A display device characterized by being a polyimide film of 10% or less.   The display device according to claim 1, wherein the display element is a liquid crystal display element.   The display device according to claim 1, wherein the display element is at least one selected from a TN liquid crystal, an STN liquid crystal, a ferroelectric liquid crystal, a guest-host liquid crystal, and a cholesteric liquid crystal.   The display element is any of an EL display element, an electrophoretic display element, an electrochromic display element, an oxidation-reduction display element, a rotating sphere type or rotating cylindrical display element, and a display element having a display format by moving dry powder. The display device according to claim 1, wherein the display device is at least one display element selected from the above.   Polyimide film having a linear expansion coefficient of 2 to 15 ppm / ° C. mainly composed of polyimide benzoxazole obtained by reacting an aromatic diamine having an benzoxazole structure with an aromatic tetracarboxylic acid anhydride. The display device according to claim 1.   The insulating substrate has a plane orientation coefficient of 0.75 or more, which is mainly composed of polyimide benzoxazole obtained by reacting an aromatic diamine having a benzoxazole structure and an aromatic tetracarboxylic anhydride, The display device according to claim 1, which is a polyimide film having an elastic modulus of 5 GPa or more and a tensile breaking strength of 300 MPa or more.

Images