JP2009098833A - Touch panel, touch panel manufacturing method, display device with input function - Google Patents

Abstract

Provided are a touch panel, a touch panel manufacturing method, and a display device with an input function, which can eliminate degradation of display quality due to Newton rings and reflection on a substrate surface with a simple configuration.
A touch panel includes a first substrate having a first electrode formed on a first surface and a translucent second substrate having a second electrode formed on a first surface. The first surfaces 11 and 21 are arranged so as to face each other with a predetermined gap therebetween, and the second surface 22 side of the second substrate 20 is pressed. Fine irregularities 21a and 22a are formed on both the first surface 21 and the second surface 22 of the second substrate 20, and the irregularities 21a and 22a are formed on the first surface 21 and the second surface 20 of the second substrate 20 made of a glass substrate. The two surfaces 22 are formed by etching.
[Selection] Figure 2

Description

  The present invention relates to a touch panel capable of detecting a position touched by a finger, a touch panel manufacturing method, and a display device with an input function including the touch panel.

  In recent years, in electronic devices such as mobile phones, car navigation systems, personal computers, ticket vending machines, bank terminals, etc., as shown in FIG. 9, a touch panel 1 is disposed on the surface of a liquid crystal device 5 and the like. There is a type in which information can be input by pressing a predetermined portion of the touch panel 1 with a finger or the like while referring to an instruction image displayed in the display area.

  Of such a touch panel 1, a resistive film type has a translucent first substrate 10 having a first electrode 15 formed on the first surface 11 and a second electrode 25 formed on the first surface 21. The translucent second substrate 20 is arranged so that the first surfaces 11 and 21 face each other with a predetermined gap, and the second surface 22 side of the second substrate 20 is pushed down. Yes. At this time, if the interval between the first substrate 10 and the second substrate 20 is narrowed and Newton rings are generated, the image displayed on the liquid crystal device 5 becomes difficult to see.

  Therefore, a configuration has been proposed in which fine irregularities are formed on the first surface 11 of the first substrate 10 or the first surface 21 of the second substrate 20 to prevent the occurrence of Newton rings (see Patent Document 1).

In addition, a configuration in which irregularities are formed on the first surface 11 and the second surface 12 of the first substrate 10 made of a polycarbonate plate to prevent the occurrence of Newton rings has been proposed (see Patent Document 2).
Japanese Utility Model Publication No. 8-2896 JP 7-169367 A

  However, in a touch panel, in particular, a display device with an input function, in addition to the Newton ring problem that occurs between the first substrate 10 and the second substrate 20, when the second substrate 20 is pressed, the first substrate 10 There is a problem that Newton rings are generated between the first substrate 10 and the liquid crystal device 5 due to bending and reflection on the second surface 22 side of the second substrate 20 makes it difficult to see the display image. In the configurations described in Documents 1 and 2, it is impossible to solve such a problem at the same time.

  In view of the above problems, an object of the present invention is to provide a touch panel, a touch panel manufacturing method, and a display with an input function that can eliminate the deterioration of display quality due to Newton rings and reflection on the substrate surface with a simple configuration To provide an apparatus.

  In order to solve the above-described problems, in the present invention, when the surfaces on the opposite sides of the substrate are the first surface and the second surface, respectively, the first substrate on which the first electrode is formed on the first surface; The second electrode having the second electrode formed on the first surface is disposed so that the first surfaces face each other with a predetermined gap, and the second surface side of the second substrate is pressed down. In the touch panel to be formed, fine irregularities are formed on both the first surface of the second substrate and the second surface of the second substrate.

  In the present invention, since the fine unevenness is formed on the first surface of the second substrate, the unevenness is also reflected on the surface of the second electrode. Therefore, no Newton ring is generated between the first substrate and the second substrate even when the second substrate is pressed. In addition, when the second substrate is pressed, even if the New substrate ring is generated between the first substrate and the liquid crystal device when the first substrate is bent, the first surface and the second surface of the second substrate are uneven. Since it is formed, the Newton ring can be made inconspicuous. Furthermore, since fine irregularities are formed on the second surface of the second substrate, reflection on the second surface of the second substrate can be suppressed, so that the problem that the displayed image is difficult to see due to reflection is avoided. can do. Furthermore, since the unevenness is reflected on the surface of the second electrode, even when the second substrate is pressed and bent, the second electrode does not adhere to and adhere to the first electrode. Therefore, when the second substrate returns from its bent state to its original shape, no abnormal noise is generated when the second electrode is separated from the first electrode, and the first electrode and the second electrode Deterioration can also be prevented.

  In the present invention, it is preferable that the first substrate is made of a glass substrate, and the irregularities are formed by etching both the first surface of the second substrate and the second surface of the second substrate. If comprised in this way, the unevenness | corrugation which prevents generation | occurrence | production of the Newton ring between a 1st board | substrate and a 2nd board | substrate, and the reflection by the 2nd surface of a 2nd board | substrate can be suppressed by one etching process. Unevenness can be formed simultaneously.

  That is, in the present invention, when the surfaces opposite to each other in the substrate are the first surface and the second surface, respectively, the first substrate having the first electrode formed on the first surface and the second electrode being the first surface A method of manufacturing a touch panel in which a translucent second substrate formed on one surface is disposed so that the first surfaces face each other with a predetermined gap, and the second surface side of the second substrate is pressed down The second substrate is made of a glass substrate, and before forming the second electrode on the second substrate, both the first surface of the second substrate and the second surface of the second substrate. On the other hand, an etching process for simultaneously forming fine irregularities by etching is performed.

  As described above, in the manufacturing method to which the present invention is applied, the unevenness that can prevent the generation of Newton rings between the first substrate and the second substrate in one etching step, and the second surface of the second substrate can be prevented. Unevenness that can suppress reflection can be formed simultaneously, and productivity is high. Further, unlike the case where only the first surface of the second substrate is etched, it is not necessary to cover the entire surface of the second surface with a protective layer against etching, so that the etching process can be performed efficiently. Furthermore, when unevenness is formed by a coating technique, problems such as adhesion occur, but if unevenness formed by etching, problems such as peeling do not occur and a highly reliable touch panel can be realized. . Furthermore, if it is an etching, since the crack etc. which existed in the glass substrate can be removed, there exists an advantage that the intensity | strength of a glass substrate can be improved.

  In the present invention, it is preferable that at least one of the first surface of the second substrate and the second surface of the second substrate is formed only in the central region while avoiding the outer peripheral region. . If comprised in this way, when sticking an adhesive sheet in the outer peripheral area | region of the 1st surface of a 2nd board | substrate, and / or the outer peripheral area | region of the 2nd surface of a 2nd board | substrate, or when sticking with an adhesive, Since the unevenness is not formed, it is possible to reliably perform the pasting.

  In another embodiment of the present invention, when the surfaces opposite to each other on the substrate are the first surface and the second surface, respectively, the first substrate having the first electrode formed on the first surface, and the second electrode A translucent second substrate formed on the first surface is arranged so that the first surfaces face each other with a predetermined gap, and the second surface side of the second substrate is pressed down Further, fine irregularities are formed on both the second surface of the first substrate and the second surface of the second substrate.

  In the present invention, since the fine irregularities are formed on the second surface of the first substrate, even if the first substrate is bent when the second substrate is pressed, a Newton ring is formed between the first substrate and the liquid crystal device. Will not occur. Further, since fine irregularities are formed on the second surface of the second substrate, even if a Newton ring is generated between the first substrate and the second substrate, it can be made inconspicuous. Furthermore, since fine irregularities are formed on the second surface of the second substrate, reflection on the second surface of the second substrate can be suppressed, so that the problem that the displayed image is difficult to see due to reflection is avoided. can do.

  In this case, the first substrate and the second substrate are both glass substrates, and the unevenness is formed by etching both the second surface of the first substrate and the second surface of the second substrate. It is preferable to become. If comprised in this way, the unevenness | corrugation which can prevent generation | occurrence | production of the Newton ring between a 1st board | substrate and an image generation apparatus and the reflection by the 2nd surface of a 2nd board | substrate can be suppressed by one etching process. Unevenness can be formed simultaneously.

  That is, in the present invention, when the surfaces opposite to each other in the substrate are the first surface and the second surface, respectively, the first substrate having the first electrode formed on the first surface and the second electrode being the first surface A method of manufacturing a touch panel in which a translucent second substrate formed on one surface is disposed so that the first surfaces face each other with a predetermined gap, and the second surface side of the second substrate is pressed down The first substrate and the second substrate are both glass substrates, and the first substrate after the first electrode is formed and the second substrate after the second electrode is formed. , A bonding step of obtaining a panel structure by bonding the first surfaces to face each other, and in the state of the panel structure, the second surface of the first substrate and the second surface of the second substrate Etching that simultaneously forms fine irregularities by etching for both And performing extent.

  As described above, in the manufacturing method to which the present invention is applied, the unevenness that can prevent the generation of Newton rings between the first substrate and the image generating device and the second surface of the second substrate can be prevented in one etching step. Unevenness that can suppress reflection can be formed simultaneously, and productivity is high. In addition, unlike the case of forming irregularities only on the second surface of the first substrate in the panel structure, it is not necessary to cover the entire surface of the second surface of the second substrate with a protective layer against etching. It can be performed efficiently. Furthermore, when unevenness is formed by a coating technique, problems such as adhesion occur, but if unevenness formed by etching, problems such as peeling do not occur and a highly reliable touch panel can be realized. . Furthermore, if it is an etching, since the crack etc. which existed in the glass substrate can be removed, there exists an advantage that the intensity | strength of a glass substrate can be improved.

  In the present invention, it is preferable that at least one of the second surface of the first substrate and the second surface of the second substrate is formed only in the central region while avoiding the outer peripheral region. . If comprised in this way, in the outer periphery area | region of the 2nd surface of a 1st board | substrate, and / or the outer periphery area | region of the 2nd surface of a 2nd board | substrate, when sticking with an adhesive, in an outer periphery area | region Since the unevenness is not formed, it is possible to reliably perform the pasting.

  In the present invention, the roughness of the unevenness is preferably 0.1 μm or more. If the projections and depressions have such dimensions, the generation of Newton rings can be reliably prevented.

  In the present invention, both the first substrate and the second substrate preferably have a haze value (turbidity value) of 40% or less. That is, if the turbidity value exceeds 40%, it is difficult to see the image generated by the image generation device, so that both the first substrate and the second substrate may have a haze value (turbidity value) of 40% or less. preferable.

  When a display device with an input function is configured using a touch panel to which the present invention is applied, an image generation device is arranged so as to overlap the first substrate side of the touch panel.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings to be referred to in the following description, the scales are different for each layer and each member so that each layer and each member have a size that can be recognized on the drawing. Further, in order to make the correspondence relationship easy to understand, portions having the same functions as those in the configuration shown in FIG.

[Embodiment 1]
(overall structure)
1 and 2 are explanatory diagrams schematically showing the configuration of a display device with an input function to which the present invention is applied. In FIG. 2, the first light-transmitting electrode and pattern of the touch panel, the second light-transmitting electrode, the pixel electrode and the counter electrode of the liquid crystal device, and the like are simply illustrated with solid lines.

  1 and 2, the display device with an input function 100 according to the present embodiment generally includes a liquid crystal device 5 as an image generating device and a touch panel disposed on the surface of the liquid crystal device 5 that emits display light. 1 (input device).

  The liquid crystal device 5 includes a transmissive active matrix liquid crystal panel (hereinafter simply referred to as a liquid crystal panel 5a). In the case of the transmissive liquid crystal panel 5a, a backlight device ( (Not shown). Further, in the liquid crystal device 5, the first polarizing plate 81 is disposed on the liquid crystal panel 5a on the display light emission side, and the second polarizing plate 82 is disposed on the opposite side.

  The liquid crystal panel 5 a includes a translucent element substrate 50, a translucent counter substrate 60 that is bonded to the element substrate 50 with a sealing material 71 in a state of being opposed to the element substrate 50, and the counter substrate 60 and the element substrate 50. And a liquid crystal layer 55 held between them. In the element substrate 50, a driving IC 75 is COG mounted in an overhanging region 59 projecting from the edge of the counter substrate 60, and a flexible substrate 73 is connected to the overhanging region 59. Note that a drive circuit may be formed on the element substrate 50 simultaneously with the switching elements on the element substrate 50.

(Detailed configuration of touch panel 1)
The touch panel 1 is a resistance film type, and includes a light-transmitting first substrate 10 having a light-transmitting first electrode 15 formed of an ITO film (Indium Tin Oxide) formed on the first surface 11 and an ITO film. The second electrode 25 formed on the first surface 21 is bonded to the translucent second substrate 20 with a sealing material 31 so that the first surfaces 11 and 21 face each other with a predetermined gap therebetween. The inside is an air layer. As the first substrate 10 and the second substrate 20, a light-transmitting thin plastic substrate or a thin glass substrate can be used. In this embodiment, a thin glass substrate is used for both the first substrate 10 and the second substrate 20. It is used. In the first substrate 10, a flexible substrate 33 is connected to the overhang region 19 that projects from the edge of the second substrate 20.

  The touch panel 1 configured as described above is arranged so as to overlap the first polarizing plate 81 of the liquid crystal device 5 and constitutes the display device 100 with an input function. In this display device with an input function 100, the liquid crystal device 5 can display a moving image or a still image in the image display area 100a, and an instruction for inputting to the display device with an input function 100 via the touch panel 1 Also display images. Accordingly, if the user presses the touch panel 1 with a finger while viewing the instruction image displayed on the liquid crystal device 5, the second substrate 20 is bent, and the first electrode 15 and the second electrode 25 are pressed at the pressed position. Touch. Therefore, if the location where the first electrode 15 and the second electrode 25 are in contact with each other is detected, the input information can be determined.

  In the display device 100 with the input function and the touch panel 1 configured as described above, in this embodiment, fine irregularities 21 a and 22 a are formed on both the first surface 21 of the second substrate 20 and the second surface 22 of the second substrate 20. The irregularities 21a are formed and reflected on the surface of the second electrode 25. As a result, fine irregularities 25a are also formed on the surface of the second electrode 25. On the other hand, the first surface 11 of the first substrate 10 and the second surface 12 of the first substrate 10 are both smooth surfaces. In this embodiment, the roughness of the irregularities 21a and 22a is 0.1 μm or more, and the second substrate 20 has a haze value of 40% or less. Therefore, in this embodiment, both the first substrate 10 and the second substrate 20 have a haze value of 40% or less and a transmittance of 60% or more.

  Thus, in this embodiment, since the fine unevenness 21a is formed on the first surface 21 of the second substrate 20, the unevenness 21a is also reflected on the surface of the second electrode 25. Therefore, even if the second base 20 plate is pressed and the first substrate 10 and the second substrate 20 are locally close to each other, no Newton ring is generated between the first substrate 10 and the second substrate 20.

  Further, when the second substrate 20 is pressed, even if the first substrate 10 is bent or a Newton ring is generated between the first substrate 10 and the liquid crystal device 5, the first surface 21 of the second substrate 20 and Since the irregularities 21a and 22a are formed on the second surface 22, such Newton rings can be made inconspicuous.

  Further, since the fine irregularities 22a are formed on the second surface 22 of the second substrate 20, reflection on the second surface 22 of the second substrate 20 can be suppressed, so that the displayed image can be seen by reflection. The problem of difficulty can be avoided.

  Furthermore, since the unevenness 25a is reflected on the surface of the second electrode 25, even when the second substrate 20 is pressed and bent, the second electrode 25 adheres to and adheres to the first electrode 15. There is nothing. Therefore, when the second substrate 20 is pressed and returned to its original shape from the bent state, no abnormal noise is generated when the second electrode 25 is separated from the first electrode 15, and the first electrode 15 and The deterioration of the second electrode 25 can also be prevented.

(Production method)
FIG. 3 is a process cross section showing a characteristic process among the manufacturing processes of the touch panel 1 according to the first embodiment of the present invention.

  In this embodiment, since both the first substrate 10 and the second substrate 20 are made of glass substrates, the irregularities 21a and 22a are simultaneously formed by etching both the first surface 11 and the second surface 22 of the second substrate 20. (Etching process). That is, in the manufacturing process of the touch panel 1, first, as shown in FIG. 3A, after preparing a glass substrate 20 a used as the second substrate 20, as shown in FIG. An etching process is performed on the entire surface to form irregularities 21 a and 22 a on the first surface 21 and the second surface 22 of the second substrate 20. For example, after the second substrate 20 is dipped in an acid treatment solution made of an aqueous solution of hydrofluoric acid and diammonium hydrogen phosphate, and then roughened, etching made of an aqueous solution of hydrofluoric acid and ammonium fluoride acid, etc. The second substrate 20 is immersed in the liquid and isotropic etching is performed to form fine irregularities 21a and 22a whose shapes are adjusted. In that case, when the alignment mark etc. are formed in the 2nd board | substrate 20, about this alignment mark, it protects with a protection sheet.

  Next, as shown in FIG. 2, the second electrode 25 is formed on the first surface 21 of the second substrate 20 by forming an ITO film by sputtering, patterning using a photolithography technique, or the like.

  Next, the first substrate 10 on which the first electrode 15 has already been formed and the second substrate 20 are bonded together with a sealing material 31 so that the first surfaces 11 and 21 face each other with a gap. After that, when the flexible substrate 33 is connected to the first substrate 10, the touch panel 1 is completed. Further, when the touch panel 1 is placed on the liquid crystal device 5, the display device 100 with an input function is completed.

  As described above, according to the manufacturing method of the present embodiment, the unevenness 21a that prevents the Newton ring from occurring between the first substrate 10 and the second substrate 20 in one etching step, and the second substrate 20 The unevenness 22a that can suppress the reflection on the second surface 22 can be formed simultaneously, and the productivity is high. Further, unlike the case where only the first surface 21 of the second substrate 20 is etched, it is not necessary to cover the entire surface of the second surface 22 with a protective layer against etching, so that the etching process can be performed efficiently.

  In addition, when unevenness is formed by a technique such as coating, problems such as adhesion occur. However, if the unevenness 21a and 22a are formed by etching, problems such as peeling do not occur and a highly reliable touch panel. 1 can be realized. Furthermore, if it is an etching, since the crack etc. which existed in the glass substrate can be removed, there exists an advantage that the intensity | strength of a glass substrate can be improved.

[Embodiment 2]
FIG. 4 is an explanatory diagram schematically showing a cross-sectional configuration of the display device with an input function 100 according to the second embodiment of the present invention. FIG. 5 is a process cross section showing a characteristic process among the manufacturing processes of the touch panel 1 according to the second embodiment of the present invention. Since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 4, the display device with an input function 100 according to the present embodiment is also overlapped with the liquid crystal device 5 as the image generation device and the surface of the liquid crystal device 5 on the side from which the display light is emitted, as in the first embodiment. The touch panel 1 is arranged. The touch panel 1 is of a resistance film type, and a translucent first substrate 10 having a translucent first electrode 15 made of an ITO film formed on the first surface 11 and a second electrode 25 made of an ITO film. The translucent second substrate 20 formed on the first surface 21 is bonded with a sealing material 31 so that the first surfaces 11 and 21 face each other with a predetermined gap therebetween, and the inside thereof is an air layer. It has become.

  In the display device 100 with an input function and the touch panel 1 configured as described above, in this embodiment, fine irregularities 12a and 22a are formed on both the second surface 12 of the first substrate 10 and the second surface 22 of the second substrate 20. Is formed. On the other hand, the first surface 11 of the first substrate 10 and the first surface 21 of the second substrate 20 are both smooth surfaces. In this embodiment, the roughness of the irregularities 12a and 22a is 0.1 μm or more. Further, in both the first substrate 10 and the second substrate 20, the haze value is 40% or less, and the transmittance is 60% or more.

  Thus, in this embodiment, since the fine irregularities 12a are formed on the second surface 12 of the first substrate 10, the first substrate 10 is bent even when the second substrate 20 is depressed. No Newton ring is generated between the liquid crystal device 5 and the liquid crystal device 5.

  Further, since the fine irregularities 22 a are formed on the second surface 22 of the second substrate 20, even if a Newton ring is generated between the first substrate 10 and the second substrate 20, it can be made inconspicuous.

  Further, since the fine irregularities 22a are formed on the second surface 22 of the second substrate 20, reflection on the second surface 22 of the second substrate 20 can be suppressed, so that the displayed image can be seen by reflection. The problem of difficulty can be avoided.

  Furthermore, the first substrate 10 and the second substrate 20 are both glass substrates, and the irregularities 12a and 22a are etched on both the second surface 12 of the first substrate 10 and the second surface 22 of the second substrate 20. Can be formed simultaneously.

  That is, in this embodiment, first, as shown in FIG. 5A, the first substrate 10 after the first electrode 15 is formed and the second substrate 20 after the second electrode 25 is formed are A bonding step of obtaining the panel structure 1a by performing bonding so that the first surfaces 11 and 21 face each other is performed. At this time, the irregularities 12 a and 22 a are not formed on the first substrate 10 and the second substrate 20.

  Next, as shown in FIG. 5B, in the state of the panel structure 1a, both the second surface 12 of the first substrate 10 and the second surface 22 of the second substrate 20 are finely etched. An etching process for simultaneously forming the irregularities 12a and 22a is performed. Also in this case, as in the first embodiment, the panel structure 1a is dipped in an acid treatment liquid composed of an aqueous solution of hydrofluoric acid and diammonium hydrogen phosphate, and then roughened, and then hydrofluoric acid and fluorine are used. The panel structure 1a is immersed in an etching solution made of an aqueous solution of ammonium hydride acid, and isotropic etching is performed to form fine irregularities 12a and 22a whose shapes are adjusted. In that case, since the pad and wiring for mounting the flexible substrate 33 are formed in the 1st board | substrate 10, it protects with a protective sheet about a pad and wiring. Moreover, when the alignment mark etc. are formed in the 1st board | substrate 10, about this alignment mark, it protects with a protective sheet. Furthermore, when an alignment mark or the like is formed on the second substrate 20, the alignment mark is protected with a protective sheet.

  Thus, in the manufacturing method of this embodiment, the unevenness 12a that can prevent the occurrence of Newton rings between the first substrate 10 and the liquid crystal device 5 and the second surface 22 of the second substrate 20 in one etching step. As a result, it is possible to form the projections and depressions 22a that can suppress reflection at the same time, resulting in high productivity. Further, unlike the case where the unevenness 12a is formed only on the second surface 12 of the first substrate 10 in the panel structure 1a, it is necessary to cover the entire second surface 22 of the second substrate 20 with a protective layer against etching. Therefore, the etching process can be performed efficiently.

[Improvements]
(Improvement of Embodiment 1)
FIG. 6 is an explanatory diagram schematically showing a cross-sectional configuration of a display device with an input function according to an improved example of the first embodiment of the present invention. Since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals, and description thereof is omitted.

  As described with reference to FIG. 2, in the first embodiment, fine irregularities 21 a and 22 a are formed on substantially the entire first surface 21 of the second substrate 20 and the second surface 22 of the second substrate 20. However, as shown in FIG. 6, in this example, on the first surface 21 of the second substrate 20, the unevenness 21 a is formed only in the central region 21 e that overlaps the input region and the image display region, and the central region 21 e on the outside. The surrounding outer peripheral region 21c is a smooth surface on which the unevenness 21a is not formed. For this reason, when the first substrate 10 and the second substrate 20 are bonded together using the sealing material 31 made of an adhesive, the adhesive is disposed in the outer peripheral region 21c where the unevenness 21a is not formed. The board | substrate 10 and the 2nd board | substrate 20 can be bonded together reliably.

  On the second surface 22 of the second substrate 20, the irregularities 22a are formed only in the central area 22e serving as the input area and the image display area, and the outer circumferential area 22c surrounding the central area 22e is formed as the irregularities 22a. The surface is not smooth. For this reason, when sticking a cover etc. on the outer peripheral region 22c of the second surface 22 of the second substrate 20 using an adhesive or the like, the adhesive is disposed in the outer peripheral region 22c where the irregularities 22a are not formed. The 2nd board | substrate 20 and a cover etc. can be bonded together reliably.

  In such a configuration, when the irregularities 21a and 22a are formed by etching, the outer peripheral region 21c of the first surface 21 of the second substrate 20 and the outer peripheral region 22c of the second surface 22 of the second substrate 20 are covered with a protective sheet. Can be realized.

  In this example, both the outer peripheral regions 21c and 22c of the second substrate 20 are smooth surfaces, but only one of the outer peripheral region 21c and the outer peripheral region 22c of the second substrate 20 may be a smooth surface.

(Improvement of Embodiment 2)
FIG. 7 is an explanatory diagram schematically showing a cross-sectional configuration of a display device with an input function according to an improved example of the second embodiment of the present invention. Since the basic configuration of the present embodiment is the same as that of the second embodiment, common portions are denoted by the same reference numerals, and description thereof is omitted.

  As described with reference to FIG. 4, in the second embodiment, fine irregularities 12 a and 22 a are formed on substantially the entire second surface 12 of the first substrate 10 and the second surface 22 of the second substrate 20. However, as shown in FIG. 7, in this example, on the second surface 12 of the first substrate 10, the unevenness 12a is formed only in the central region 12e overlapping the input surface and the image display region, and the central region 12e is located outside. The surrounding outer peripheral region 12c is a smooth surface on which the irregularities 12a are not formed. For this reason, when the outer peripheral region 12c of the first substrate 10 and the liquid crystal device 5 are bonded to each other using the adhesive, the adhesive is disposed in the outer peripheral region 12c where the irregularities 12a are not formed. And the liquid crystal device 5 can be securely bonded together.

  Further, on the second surface 22 of the second substrate 20, the unevenness 22a is formed only in the central region 22e which is the input surface and the image display region of the liquid crystal device 5, and the outer peripheral region 22c surrounding the central region 22e on the outside is It is a smooth surface on which the irregularities 22a are not formed. For this reason, when sticking a cover etc. on the outer peripheral region 22c of the second surface 22 of the second substrate 20 using an adhesive or the like, the adhesive is disposed in the outer peripheral region 22c where the irregularities 22a are not formed. The 2nd board | substrate 20 and a cover etc. can be bonded together reliably.

  In this configuration, when the irregularities 12a and 22a are formed by etching, the outer peripheral region 12c of the second surface 12 of the first substrate 10 and the outer peripheral region 22c of the second surface 22 of the second substrate 20 are covered with a protective sheet. Can be realized.

  In this example, both the outer peripheral region 12c of the first substrate 10 and the outer peripheral region 22c of the second substrate 20 are smooth surfaces. However, the outer peripheral region 12c of the first substrate 10 and the outer peripheral region of the second substrate 20 are used. Only one of 22c may be a smooth surface.

[Example of mounting on electronic equipment]
Next, an electronic apparatus to which the display device with an input function 100 according to the above-described embodiment is applied will be described. FIG. 8A shows a configuration of a mobile personal computer including the display device 100 with an input function. The personal computer 2000 includes a display device 100 with an input function as a display unit and a main body 2010. The main body 2010 is provided with a power switch 2001 and a keyboard 2002. FIG. 8B shows a configuration of a mobile phone including the display device 100 with an input function. The cellular phone 3000 includes a plurality of operation buttons 3001, scroll buttons 3002, and the display device 100 with an input function as a display unit. By operating the scroll button 3002, the screen displayed on the display device 100 with an input function is scrolled. FIG. 8C shows a configuration of a personal digital assistant (PDA) to which the display device 100 with an input function is applied. The information portable terminal 4000 includes a plurality of operation buttons 4001, a power switch 4002, and the display device 100 with an input function as a display unit. When the power switch 4002 is operated, various kinds of information such as an address book and a schedule book are displayed on the display device 100 with an input function.

  Note that electronic devices to which the display device 100 with an input function is applied include those shown in FIG. 8, digital still cameras, liquid crystal televisions, viewfinder type, monitor direct-view type video tape recorders, car navigation devices, pagers, and electronic devices. Examples include a notebook, a calculator, a word processor, a workstation, a videophone, a POS terminal, and a device equipped with a touch panel. And the display apparatus 100 with an input function mentioned above is applicable as a display part of these various electronic devices.

It is explanatory drawing which shows typically the structure of the display apparatus with an input function to which this invention is applied. It is explanatory drawing which shows typically the cross-sectional structure of the display apparatus with an input function which concerns on Embodiment 1 of this invention. It is process sectional drawing which shows the manufacturing method of the touch panel shown in FIG. It is explanatory drawing which shows typically the cross-sectional structure of the display apparatus with an input function which concerns on Embodiment 2 of this invention. It is process sectional drawing which shows the manufacturing method of the touch panel shown in FIG. It is explanatory drawing which shows typically the cross-sectional structure of the display apparatus with an input function which concerns on the improvement example of Embodiment 1 of this invention. It is explanatory drawing which shows typically the cross-sectional structure of the display apparatus with an input function which concerns on the example of improvement of Embodiment 2 of this invention. It is explanatory drawing of the electronic device using the display apparatus with an input function which concerns on this invention. It is sectional drawing of the conventional display apparatus with an input function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Touch panel, 1a ... Panel structure, 5 .... Liquid crystal device, 10 .... first substrate, 11 .... first surface of first substrate, 12 .... second surface of first substrate, 12a, 21a 22a... Fine irregularities 15.. 1st electrode of first substrate 21.. 1st surface of second substrate 20.. 2nd substrate 22.. 2nd surface of second substrate 25. -Second electrode of second substrate, 100-Display device with input function

Claims (11)

When the surfaces located on opposite sides of the substrate are the first surface and the second surface,
The first substrate having the first electrode formed on the first surface and the translucent second substrate having the second electrode formed on the first surface face each other with a predetermined gap therebetween. In the touch panel where the second surface side of the second substrate is pressed,
A fine touch panel is formed on both the first surface of the second substrate and the second surface of the second substrate. The second substrate comprises a glass substrate;
The touch panel as set forth in claim 1, wherein the unevenness is formed by etching both the first surface of the second substrate and the second surface of the second substrate.   The unevenness is formed only in a central region while avoiding an outer peripheral region on at least one of the first surface of the second substrate and the second surface of the second substrate. The touch panel according to 1 or 2. When the surfaces located on opposite sides of the substrate are the first surface and the second surface,
The first substrate having the first electrode formed on the first surface and the translucent second substrate having the second electrode formed on the first surface face each other with a predetermined gap therebetween. In the touch panel where the second surface side of the second substrate is pressed,
A fine touch panel is formed on both the second surface of the first substrate and the second surface of the second substrate. The first substrate and the second substrate are both glass substrates,
The touch panel as set forth in claim 3, wherein the unevenness is formed by etching both the second surface of the first substrate and the second surface of the second substrate.   The unevenness is formed only in a central region while avoiding an outer peripheral region on at least one of the second surface of the first substrate and the second surface of the second substrate. The touch panel according to 4 or 5.   The touch panel according to claim 1, wherein the roughness of the unevenness is 0.1 μm or more.   The touch panel according to claim 1, wherein each of the first substrate and the second substrate has a haze value of 40% or less. When the surfaces located on opposite sides of the substrate are the first surface and the second surface,
The first substrate having the first electrode formed on the first surface and the translucent second substrate having the second electrode formed on the first surface face each other with a predetermined gap therebetween. In the method of manufacturing a touch panel in which the second surface side of the second substrate is pressed down,
The second substrate is a glass substrate;
Etching that simultaneously forms fine irregularities by etching on both the first surface of the second substrate and the second surface of the second substrate before forming the second electrode on the second substrate. A manufacturing method of a touch panel characterized by performing a process. When the surfaces located on opposite sides of the substrate are the first surface and the second surface,
The first substrate having the first electrode formed on the first surface and the translucent second substrate having the second electrode formed on the first surface face each other with a predetermined gap therebetween. In the method of manufacturing a touch panel in which the second surface side of the second substrate is pressed down,
The first substrate and the second substrate are both glass substrates,
Bonding to obtain a panel structure by bonding the first substrate after forming the first electrode and the second substrate after forming the second electrode so that the first surfaces face each other Process,
A touch panel characterized by performing an etching process in which fine irregularities are simultaneously formed by etching on both the second surface of the first substrate and the second surface of the second substrate in the state of the panel structure. Manufacturing method. A display device with an input function, comprising the touch panel according to any one of claims 1 to 8,
The display device with an input function, wherein an image generating device is disposed on the first substrate side of the touch panel.

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