JP3773037B2 - Liquid crystal display - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a liquid crystal display device, and more particularly to a field effect liquid crystal display device having excellent time-division driving characteristics and capable of monochrome and multicolor display.
[0002]
[Prior art]
As a type of liquid crystal display device, a so-called twisted nematic type (TN) has a helical structure twisted by 90 degrees with nematic liquid crystal having positive dielectric anisotropy between two electrode substrates, and A polarizing plate was arranged outside the two electrode substrates so that the polarization axis (or absorption axis) thereof was orthogonal or parallel to the adjacent liquid crystal molecules on the electrode substrate (Japanese Patent Publication No. 51-13666). .
[0003]
Such a liquid crystal display device with a twist angle (α) of 90 degrees has problems in terms of steepness (γ) of change in transmittance of the liquid crystal layer versus voltage applied to the liquid crystal layer, and viewing angle characteristics, and time division. The number (corresponding to the number of scanning electrodes) was 64, which was a practical limit. However, super twisted nematic (STN) in which the twist angle α of the liquid crystal molecules is larger than 180 degrees has been proposed in order to cope with the recent improvement in image quality and increase in the amount of display information for liquid crystal display elements. Applied Physics Letter 45, No. 10, 1021 1984 (Applied Physics Letter, TJScheffer, J. Nehring: "A new, highly multiplexable" liquid crystal display "), and a super twisted birefringence effect (SBE) liquid crystal display device has been proposed.
[0004]
This type of liquid crystal display device includes a liquid crystal display panel composed of an upper frame having a display window, a liquid crystal plate integrated with a drive circuit board, a light guide assembly composed of a light diffusion plate and a light guide plate, and the light guide. An intermediate frame for housing a body assembly and mounting a linear baclite light source on at least one side, and a lower frame, and laminating them in the above order, and connecting and fixing the upper frame and the lower frame Become.
[0005]
FIG. 12 is an exploded perspective view for explaining the configuration of a conventional liquid crystal display device, wherein 1 is an upper frame, 3 is a liquid crystal display window, 62 is a liquid crystal display panel, 35 is a drive circuit board, 13 is a frame-like spacer, 37 is a light guide assembly comprising a light diffusion plate and a light guide plate, 42 is an intermediate frame for mounting a linear backlight light source, 36 is a backlight light source (lamp) comprising a cold cathode tube, 17 is a lamp cover, 2 is a bottom It is a frame.
[0006]
Reference numeral 18 denotes a cut-and-raised piece soldered to the ground pad 24 formed on the drive circuit board 35, 20 denotes a claw to be fixed to the claw receiver 25 formed on the lower frame 2, and 14 denotes the upper frame 1 and the liquid crystal display panel 62. It is an adhesive tape that fixes
[0007]
In the figure, the liquid crystal display device is sandwiched and fixed between an upper frame 1 and a lower frame 2 in the order shown. A linear light source (backlight light source) 36 composed of a cold cathode tube is installed on one end side of the intermediate frame 42, and the lamp cover 17 blocks direct light in the direction of the liquid crystal display panel 62, and the emitted light is used as a light diffusion plate. And directed toward the light guide assembly 37 made of the light guide plate.
[0008]
The frame-shaped spacer 13 is interposed between the light guide assembly 37 installed in the recess formed in the intermediate frame 42 and the liquid crystal display panel 62 to determine the display area, and the light from the light guide assembly 37. Prevent leakage and entry of foreign objects.
[0009]
It is also known that a sponge-like silicon rubber piece is used for each side instead of the frame-like spacer 13 as described above.
[0010]
FIG. 13 is an explanatory view of an intermediate frame portion used in a conventional liquid crystal display device, wherein (a) is a perspective view showing a state in which a frame-like spacer 13 is placed at a predetermined position, and (b) is ( (a) AA ', BB', CC 'fragmentary sectional view of (a), (c) is a DD' partial sectional view of (a).
[0011]
In the same figure, as shown in (a), the frame-shaped spacer 13 is placed so as to cover the side of the light guide assembly 37 accommodated in the frame of the intermediate frame 42 from the upper side (liquid crystal display panel side). Is done.
[0012]
Note that one side of the light guide assembly 37 exists up to a position close to the backlight light source 36 and receives light from the backlight light source 36.
[0013]
That is, as can be seen from the cross-sectional views of (b) and (c), each side of the light guide assembly 37 is covered from above by the frame-shaped spacer 13 to prevent light leakage and entry of foreign matter.
[0014]
[Problems to be solved by the invention]
In the above-described conventional liquid crystal display device, the frame-like spacer 13 covering each side of the light guide assembly is manufactured by pressing a resin sheet such as polyethylene terephthalate (PET). In addition, there is a problem that alignment with the intermediate frame is difficult, and it is difficult to assemble with high accuracy.
[0015]
Further, in the case of using sponge-like silicon rubber pieces on each side instead of the frame-shaped spacer, there is a problem that the alignment work with the intermediate frame is more difficult than the frame-shaped spacer.
[0016]
SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device that solves the above-mentioned problems of the prior art, improves assembly accuracy, and can effectively prevent light leakage and entry of foreign matter.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, as shown in FIG. 1, the present invention includes a liquid crystal display panel 62 comprising an upper frame 1 having a display window 3 and a liquid crystal plate in which a drive circuit board 35 is integrated. A light guide assembly 37 including a diffusion plate and a light guide plate, a frame-shaped intermediate frame 42 that houses the light guide assembly 37 and mounts a linear backlight light source 36 on at least one side, and a lower frame 2 In a liquid crystal display device in which the upper frame 1 and the lower frame 2 are connected and fixed in this order,
[0018]
As shown in FIG. 2, each side 13-1, 13-that covers each side of the light guide assembly from the side of the liquid crystal display panel on the inner side of the intermediate frame 42 that houses the light guide assembly 37. A frame spacer made of 2, 13-3, 13-4 is integrally formed.
[0019]
[Action]
Side spacers 13-1, 13-2, 13-3, and 13-that cover each side of the light guide assembly from the liquid crystal display panel side on the inner side of the intermediate frame 42 that houses the light guide assembly 37. Since the frame-shaped spacer consisting of 4 is integrally molded, there is no need to prepare a separate spacer as in the conventional case, and there is no need for positioning work with the light guide assembly. A highly accurate liquid crystal display device can be provided.
[0020]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an exploded perspective view for explaining the configuration of a liquid crystal display device according to the present invention, wherein 1 is an upper frame, 3 is a liquid crystal display window, 62 is a liquid crystal display panel, 35 is a drive circuit board, and 13-1, 13-. 2, 13-3 and 13-4 are side spacers constituting a frame-shaped spacer formed integrally with the intermediate frame, 37 is a light guide assembly comprising a light diffusion plate and a light guide plate, and 42 is a linear backlight. An intermediate frame on which the light source 36 is mounted, 36 is a backlight light source (lamp) made of a cold cathode tube, 17 is a lamp cover, and 2 is a lower frame. This intermediate frame is a resin molded product.
[0021]
Reference numeral 18 denotes a cut-and-raised piece to be soldered to the ground pad 24 formed on the drive circuit board 35, 20 denotes a claw to be fixed to the claw receiver 25 formed on the lower frame, and 14 denotes to fix the upper frame 1 and the liquid crystal display panel. It is an adhesive tape.
In the figure, the liquid crystal display device is sandwiched and fixed between an upper frame 1 and a lower frame 2 in the order shown in the drawing. A linear light source (backlight light source) 36 composed of a cold cathode tube is installed on one end side of the intermediate frame 42, and the lamp cover 17 blocks direct light in the direction of the liquid crystal display panel 62, and the emitted light is used as a light diffusion plate. And directed toward the light guide assembly 37 made of the light guide plate.
[0022]
The light guide assembly 37 is covered with each side 13-1, 13-2, 13-3, and 13-4 constituting a frame-shaped spacer formed integrally with the intermediate frame 42. Light leakage and foreign matter are prevented.
[0023]
2A and 2B illustrate the structure of an intermediate frame constituting one embodiment of a liquid crystal display device according to the present invention. FIG. 2A is a perspective view, and FIG. 2B is a cross-sectional view taken along lines AA ', BB', and C- of FIG. C 'sectional drawing, (c) is DD' sectional drawing of (a), Comprising: The same code | symbol as FIG. 1 respond | corresponds to the same part.
[0024]
As shown in the figure, the intermediate frame 42 accommodates the light guide assembly 37 and each side spacer 13-constituting a frame-like spacer that covers each side of the light guide assembly from the liquid crystal display panel side. 1, 13-2, 13-3, and 13-4 are integrally formed, and the light guide assembly is housed from the lower side of the intermediate frame 42, so that each side thereof corresponds to each side spacer 13-1, 13-2, 13-3, and 13-4, and one side is exposed in the direction of the backlight light source 36 and is arranged to receive light from the backlight light source 36.
[0025]
That is, since the sides 13-1, 13-2, 13-3, 13-4 constituting the frame-shaped spacer are integrally formed with the intermediate frame 42, these spacers leak light around the liquid crystal display panel. No foreign matter enters between the light guide assembly and the liquid crystal display panel.
[0026]
And since each side spacer 13-1, 13-2, 13-3, 13-4 which comprises this frame-shaped spacer is integrally formed with the intermediate frame 42, the number of parts is reduced, Cost reduction and work efficiency can be improved.
[0027]
Hereinafter, a specific example in which the above configuration is applied to a super twisted nematic (STN) liquid crystal display device will be described. In the following drawings, components having the same function are denoted by the same reference numerals, and repeated description thereof is omitted.
[0028]
"Example 1"
FIG. 3 shows the alignment direction (for example, rubbing direction) of the liquid crystal molecules, the twist direction of the liquid crystal molecules, the polarization axis (or absorption axis) direction of the polarizing plate, and the birefringence effect when the liquid crystal display device 62 according to the present invention is viewed from above. FIG. 4 shows a perspective view of the main part of the liquid crystal display device 62 according to the present invention.
[0029]
The twist direction 10 and the twist angle θ of the liquid crystal molecules are determined by the rubbing direction 6 of the alignment film 21 on the upper electrode substrate 11, the rubbing direction 7 of the alignment film 22 on the lower electrode substrate 12, and the upper electrode substrate 11 and the lower electrode substrate 12. It is defined by the type and amount of the optical rotatory material added to the nematic liquid crystal layer 50 sandwiched therebetween.
[0030]
In FIG. 4, in order to align the liquid crystal molecules between two upper and lower electrode substrates 11 and 12 sandwiching the liquid crystal layer 50 so as to form a spiral structure, the upper and lower electrode substrates 11 and 12 are For example, a so-called rubbing method is employed in which the surfaces of the alignment films 21 and 22 made of an organic polymer resin made of polyimide, for example, in contact with the liquid crystal are rubbed in one direction with, for example, a cloth. The rubbing direction at this time, that is, the rubbing direction, the rubbing direction 6 in the upper electrode substrate 11, and the rubbing direction 7 in the lower electrode substrate 12 become the alignment direction of the liquid crystal molecules.
[0031]
The two upper and lower electrode substrates 11 and 12 subjected to the orientation treatment are opposed to each other with a gap d ₁ so that the rubbing directions 6 and 7 intersect each other at approximately 180 to 360 degrees. A nematic in which a plurality of electrode substrates 11 and 12 are bonded together by a frame-shaped sealing material 52 having a notch 51 for injecting liquid crystal, and a predetermined amount of an optical rotation material is added to the gap with positive dielectric anisotropy. When the liquid crystal is sealed, the liquid crystal molecules are arranged in a spiral structure with a twist angle θ in the figure between the electrode substrates. Reference numerals 31 and 32 are upper and lower electrodes, respectively.
[0032]
A member (hereinafter referred to as a birefringent member) 40 that provides a birefringence effect is disposed on the upper electrode substrate 11 of the liquid crystal cell 60 thus configured. Further, the member 40 and the liquid crystal cell 60 are connected to each other. Upper and lower polarizing plates 15 and 16 are provided.
[0033]
The twist angle θ of the liquid crystal molecules in the liquid crystal 50 is preferably 200 to 300 degrees, but avoids the phenomenon that the lighting state in the vicinity of the threshold value of the transmittance-applied voltage curve becomes an orientation that scatters light, and has excellent time-sharing characteristics. From the practical viewpoint of maintaining the temperature, the range of 230 to 270 degrees is more preferable.
[0034]
This condition basically serves to make the response of the liquid crystal molecules to voltage more sensitive and to realize excellent time division characteristics. Also, excellent in order to obtain a display quality, the product Δn ₁ · d ₁ is preferably 1.0μm from 0.5μm refractive index anisotropy [Delta] n ₁ of the liquid crystal layer 50 and its thickness d _1, and more preferably Is preferably set in the range of 0.6 μm to 0.9 μm.
[0035]
The birefringent member 40 acts to modulate the polarization state of the light transmitted through the liquid crystal cell 60, and converts what can only be colored by the liquid crystal cell 60 alone into black and white display. For this purpose, a very important product [Delta] n ₂ · d ₂ of the refractive index anisotropy [Delta] n ₂ and the thickness d ₂ of the birefringent member 40, preferably 0.8μm from 0.4 .mu.m, more preferably 0 Set in the range of 5 μm to 0.7 μm.
[0036]
Further, since the liquid crystal display device 62 according to the present invention uses elliptically polarized light due to birefringence, the axes of the polarizing plates 15 and 16 and the optical axis when a uniaxial transparent birefringent plate is used as the birefringent member 40 are used. And the relationship between the liquid crystal alignment directions 6 and 7 of the electrode substrates 11 and 12 of the liquid crystal cell 60 is extremely important.
[0037]
Here, the effect of the above relationship will be described with reference to FIG. This figure shows the relationship between the axis of the polarizing plate, the optical axis of the uniaxial transparent birefringent member, and the liquid crystal alignment direction of the electrode substrate of the liquid crystal cell when the liquid crystal display device having the configuration of FIG. 4 is viewed from above. is there.
[0038]
In FIG. 3, 5 is the optical axis of the uniaxial transparent birefringent member 40, 6 is the liquid crystal alignment direction of the birefringent member 40 and the upper electrode substrate 11 adjacent thereto, 7 is the liquid crystal alignment direction of the lower electrode substrate 12, 8 Is the absorption axis or polarization axis of the upper polarizing plate 15, the angle α is the angle between the liquid crystal alignment direction 6 of the upper electrode substrate 11 and the optical axis 5 of the uniaxial birefringent member 40, and the angle β is the upper polarizing plate 15. The angle γ between the absorption axis or the polarization axis 8 of the light beam and the optical axis 5 of the uniaxial transparent birefringent member 40 is the angle γ between the absorption axis or the polarization axis 9 of the lower polarizing plate 16 and the liquid crystal alignment direction 7 of the lower electrode substrate 12. This is the angle formed by
[0039]
Here, how to measure the angles α, β, and γ is defined. In FIG. 8, a crossing angle between the optical axis 5 of the birefringent member 40 and the liquid crystal alignment direction 6 of the upper electrode substrate 11 will be described as an example.
[0040]
The crossing angle between the optical axis 5 and the liquid crystal alignment direction 6 can be expressed by φ ₁ and φ ₂ as shown in FIG. 8, but the smaller one of φ ₁ and φ ₂ is adopted here. That is, since φ ₁ <φ ₂ in FIG. 8A, φ ₁ is the intersection angle of the optical axis 5 and the liquid crystal alignment direction 6, and φ ₁ > φ ₂ in FIG. 8B. Therefore, φ ₂ is an intersection angle between the optical axis 5 and the liquid crystal alignment direction 6. Of course, either of them may be adopted when φ ₁ = φ ₂ .
[0041]
In this type of liquid crystal display device, the angles α, β, and γ are extremely important. The angle α is preferably 50 ° to 90 °, more preferably 70 ° to 90 °, the angle β is preferably 20 ° to 70 °, more preferably 30 ° to 60 °, and the angle γ is preferably 0 ° to 0 °. It is desirable to set each of 70 degrees, more preferably 0 to 50 degrees.
[0042]
If the twist angle θ of the liquid crystal layer 50 of the liquid crystal cell 60 is within a range of 180 degrees to 360 degrees, the angles α, β, and the like are obtained regardless of whether the twist direction 10 is the clockwise direction or the counterclockwise direction. γ may be in the above range.
[0043]
In FIG. 4, the birefringent member 40 is disposed between the upper polarizing plate 15 and the upper electrode substrate 11. Instead, the birefringent member 40 is disposed between the lower electrode substrate 12 and the lower polarizing plate 16. Also good. In this case, the entire configuration of FIG. 4 is inverted.
[0044]
"Example 2"
The basic structure is the same as that shown in FIGS. In FIG. 5, the twist angle θ of the liquid crystal molecules is 240 degrees, and the uniaxial transparent birefringent member 40 is a liquid crystal cell that is aligned in parallel (homogeneous alignment), that is, has a twist angle of 0 degrees.
[0045]
Here, the ratio d / p between the thickness d (μm) of the liquid crystal layer and the helical pitch p (μm) of the liquid crystal material to which the optical rotatory substance was added was about 0.53. The alignment films 21 and 22 were formed of a polyimide resin film and used after being rubbed. The tilt angle (pretilt angle) at which the alignment film subjected to the rubbing treatment tilts and aligns liquid crystal molecules in contact with the alignment film is about 4 degrees. Δn ₂ · d ₂ of the uniaxial transparent birefringent member 40 is about 0.6 μm. On the other hand, Δn ₁ · d ₁ of the liquid crystal layer 50 having a structure in which liquid crystal molecules are twisted by 240 degrees is about 0.8 μm.
[0046]
At this time, by setting the angle α to about 90 degrees, the angle β to about 30 degrees, and the angle γ to about 30 degrees, the voltage applied to the liquid crystal layer 50 via the upper and lower electrodes 31 and 32 is below the threshold value. Occasionally, light non-transmission, ie, black, and when the voltage exceeds a certain threshold, light transmission, ie, black and white display of white could be realized. When the axis of the lower polarizing plate 16 is rotated from 50 to 90 degrees from the above position, white is applied when the voltage applied to the liquid crystal layer 50 is lower than the threshold value, and black when the voltage is higher than the threshold value. Black and white display was realized.
[0047]
FIG. 6 shows the change in contrast during time-division driving with 1/200 duty when the angle α can be changed with the configuration of FIG. What is showing extremely high contrast when the angle α is in the vicinity of 90 degrees decreases as it deviates from this angle. In addition, when the angle α decreases, both the lighting part and the non-lighting part are bluish. When the angle α increases, the non-lighting part becomes purple and the lighting part becomes yellow, and in any case, monochrome display is impossible. The angle β and the angle γ are almost the same, but in the case of the angle γ, as described above, when the angle is rotated from 50 degrees to 90 degrees, the black and white display is reversed.
[0048]
"Example 3"
The basic structure is the same as “Specific Example 2”. However, the difference is that the twist angle of the liquid crystal molecules of the liquid crystal layer 50 is 260 degrees and Δn ₁ · d ₁ is about 0.65 μm to 0.75 μm. The Δn ₂ · d ₂ of the parallel alignment liquid crystal layer used as the uniaxial transparent birefringent member 40 is about 0.58 μm, which is the same as “Specific Example 2”.
[0049]
At this time, by setting the angle α to about 100 degrees, the angle β to about 35 degrees, and the angle γ to about 15 degrees, the same monochrome display as that of the “specific example 1” can be realized. In addition, it is the same as “Specific Example 2” in that reverse black and white display is possible by rotating the axis of the lower polarizing plate by 50 to 90 degrees from the above value. The inclination with respect to the deviation of the angles α, β, and γ is substantially the same as “Specific example 2”.
[0050]
In any of the above specific examples, a parallel alignment liquid crystal cell without twisting of liquid crystal molecules is used as the uniaxial transparent birefringent member 40, but a liquid crystal layer in which liquid crystal molecules are twisted by about 20 to 60 degrees is used. There is little color change by angle. Like the liquid crystal layer 50, the twisted liquid crystal layer is formed by sandwiching the liquid crystal between substrates in which the alignment treatment direction of the pair of transparent substrates subjected to the alignment treatment intersects a predetermined twist angle. The In this case, the bisecting angle direction between the two alignment treatment directions sandwiching the twisted structure of the liquid crystal molecules may be handled as the optical axis of the birefringent member.
[0051]
Further, a transparent polymer film may be used as the birefringent member 40 (in this case, a uniaxially stretched one is preferable). In this case, PET (polyethylene terephthalate), acrylic resin, and polycarbonate are effective as the polymer film.
[0052]
Furthermore, in the above specific example, the birefringent member is single, but in FIG. 4, in addition to the birefringent member 40, another birefringent member is interposed between the lower electrode substrate 12 and the lower polarizing plate 16. A refractive member can also be inserted. In this case, Δn ₂ · d ₂ of these birefringent members may be readjusted.
[0053]
"Example 4"
The basic structure is the same as “Specific Example 2”. However, as shown in FIG. 9, by providing red, green, and blue color filters 33R, 22G, and 33B on the upper electrode substrate 11, and a light shielding film 33D between the filters, multicolor display is possible. FIG. 7 shows the relationship between the alignment direction of the liquid crystal molecules, the twist direction of the liquid crystal molecules, the direction of the polarizing plate axis, and the optical axis of the birefringent member in “Specific Example 4”.
[0054]
In FIG. 9, the upper electrode 31 is formed on the color filters 33R, 22G, 33B and the light shielding film 33D on which the smooth layer 23 made of an insulating material for reducing the influence of these irregularities is formed. An alignment film 21 is formed.
[0055]
FIG. 10 shows a block diagram in which the liquid crystal display module 63 according to the present invention shown in FIG. 1 is used for a display unit of a laptop personal computer, and FIG.
[0056]
In FIG. 10, the liquid crystal display module is driven by the driving IC 34 via the control LSI 48 based on the result calculated by the microprocessor 49.
[0057]
According to the present embodiment configured as described above, it is possible to provide a liquid crystal display device which has no display unevenness due to heat generation of the backlight light source and which has improved luminance by eliminating the leakage current of the backlight.
[0058]
The invention described in the claims of the present invention is not limited to the above-described STN type liquid crystal display device, but can be similarly applied to other types of liquid crystal display devices equipped with a backlight.
[0059]
【The invention's effect】
As described above, according to the present invention, the lower frame that integrally holds the liquid crystal display device together with the upper frame is formed of an aluminum thin plate, thereby reducing the weight of the liquid crystal display device and improving the heat radiation effect of the backlight light source, Further, a cutout portion provided at a position symmetrical to a line orthogonal to the central portion of the backlight light source at least across the area of the liquid crystal display panel in a direction orthogonal to the backlight light source forms a uniform temperature distribution on the entire surface of the liquid crystal display panel. , It is possible to prevent the display from becoming uneven.
[0060]
Further, the leakage current of the backlight is reduced by at least two cutout portions provided in the longitudinal direction of the backlight directly under the backlight light source and notches provided in lower portions of both ends of the backlight light source. It is possible to provide various liquid crystal display devices that can suppress a decrease in luminance and can obtain a high-quality image display.
[0061]
[Brief description of the drawings]
FIG. 1 is an exploded perspective view illustrating a configuration of an embodiment of a liquid crystal display device according to the present invention.
FIGS. 2A and 2B are perspective views illustrating the structure of an intermediate frame constituting one embodiment of a liquid crystal display device according to the present invention, and FIG. 2B is a perspective view taken along lines AA ′, BB ′, and C in FIG. -C 'sectional drawing, (c) is DD' sectional drawing of (a).
FIG. 3 is an explanatory diagram showing the relationship among the alignment direction of liquid crystal molecules, the twist direction of liquid crystal molecules, the axis direction of a polarizing plate, and the optical axis of a birefringent member in Example 1 of the liquid crystal display device according to the present invention.
FIG. 4 is a perspective view of a main part for explaining a stacking relationship of components of a liquid crystal display device according to the present invention.
FIG. 5 is an explanatory diagram of the relationship among the alignment direction of liquid crystal molecules, the twist direction of liquid crystal molecules, the axis direction of a polarizing plate, and the optical axis of a birefringent member in a specific example 2 of the liquid crystal display device according to the present invention.
FIG. 6 is an explanatory diagram of contrast, transmitted light color-intersection angle α characteristics in the specific example 1 of the liquid crystal display device according to the present invention.
FIG. 7 is an explanatory diagram of the relationship among the alignment direction of liquid crystal molecules, the twist direction of liquid crystal molecules, the axis direction of a polarizing plate, and the optical axis of a birefringent member in a specific example 3 of the liquid crystal display device according to the present invention.
FIG. 8 is an explanatory diagram of how to measure the intersection angles α, β, γ in the liquid crystal display device according to the present invention.
FIG. 9 is a partially cutaway perspective view illustrating a configuration of an upper electrode substrate portion in a liquid crystal display device according to the present invention.
FIG. 10 is a block diagram when the liquid crystal display device according to the present invention is used in a display unit of a laptop personal computer.
FIG. 11 is an external view when the liquid crystal display device according to the present invention is used in a display unit of a laptop personal computer.
FIG. 12 is an exploded perspective view illustrating a configuration of a conventional liquid crystal display device.
13A and 13B are explanatory views of an intermediate frame portion used in a conventional liquid crystal display device, in which FIG. 13A is a perspective view showing a state where a frame-like spacer is placed at a predetermined position, and FIG. (a) AA ', BB', CC 'fragmentary sectional view of (a), (c) is a DD' partial sectional view of (a).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Upper frame 2 Lower frame 3 Liquid crystal display window 13-1, 13-2, 13-3, 13-4 Spacer 14 Adhesive tape 17 which fixes an upper frame and a liquid crystal display panel Lamp cover 18 The ground formed in the drive circuit board Cut-and-raised piece 20 soldered to pad Claw fixed to claw receptacle formed on lower frame 24 Ground pad 25 Claw receptacle 35 Drive circuit board 36 Backlight light source (lamp) comprising cold cathode tube
37 A light guide assembly 42 comprising a light diffusing plate and a light guide plate An intermediate frame 62 on which a linear backlight is mounted A liquid crystal display panel.

Claims (1)

A liquid crystal display panel;
The light guide assembly is accommodated therein, a backlight light source is mounted on at least one side, and each side of the light guide assembly is covered from the liquid crystal display panel side to prevent light leakage from the light guide assembly. An intermediate frame of a resin molded product in which a frame-shaped spacer for preventing is integrally formed,
A liquid crystal display device comprising an upper frame and a lower frame for sandwiching and fixing the liquid crystal display panel and the intermediate frame.

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