JP2007025361A - Display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high reliability display apparatus capable of being made low in profile without decreasing manufacturing yield. <P>SOLUTION: The display apparatus is provided with: a display panel 100 with an effective display part constituted of a plurality of display pixels; a flexible wiring board 142 connected to a peripheral part located outside of the effective display part on the surface of the display panel 100; a driving IC chip 141 which is located in the peripheral part on the display surface of the display panel 100 and outputs a driving signal to drive each display pixel on the effective display part; a resin coat 160 applied to a gap between the display panel 100 and the flexible wiring board 142; and a light shielding tape 150 which is located on the rear face of the display panel 100 and shades an area corresponding to the position of the driving chip IC arrangement. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device, and more particularly to a display device including a display panel and a backlight unit that illuminates from the back side.

  A display device such as a liquid crystal display device includes a display panel including an effective display unit that is configured by matrix display pixels. In the effective display unit, the display panel includes a plurality of scanning lines extending along the row direction of the display pixels, a plurality of signal lines extending along the column direction of the display pixels, and the scanning lines and the signal lines. A switching element disposed near the intersection, a pixel electrode connected to the switching element, and the like are provided.

The display device also includes a flexible wiring board for supplying various signals to the display panel. One end of the flexible wiring board is connected to one edge of the display panel, for example. The flexible wiring board is bent to the back side of the display panel, and is attached to a housing that holds the display panel with a double-sided tape (for example, see Patent Document 1).
JP-A-9-138388

  In the gap between the display panel and the flexible wiring board, a resin coat is disposed for the purpose of short-circuiting when conductive foreign matter is caught, countermeasures against corrosion due to condensation, and reinforcement. In recent years, with the demand for thin display devices, a very thin insulating substrate of about 0.2 mm has been applied. For this reason, a part of the resin coat applied to the gap between the display panel and the flexible wiring board can easily ride on the insulating substrate constituting the display panel.

  In particular, in the configuration in which the driving IC chip is mounted on the front surface side of the display panel, a light shielding tape is disposed on the back surface side of the display panel in order to prevent malfunction due to light being applied to the driving IC chip. When the resin coat rides on the light shielding tape, a convex portion having a locally increased thickness is formed. Such a convex portion becomes a fulcrum when the flexible wiring board is bent to the back surface side, and stress is likely to be concentrated, which may cause damage to the insulating substrate.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a highly reliable display device that can be thinned without causing a reduction in manufacturing yield.

A display device according to a first aspect of the present invention includes:
A display panel including an effective display unit configured by a plurality of display pixels;
A flexible wiring board connected to the display panel;
A driving IC chip that is disposed on the outer peripheral portion located outside the effective display portion on the surface of the display panel and outputs a driving signal for driving each display pixel in the effective display portion;
A resin coat applied to a gap between the display panel and the flexible wiring board;
A light-shielding medium that is disposed on the back surface of the display panel, shields light from an area corresponding to the position where the drive IC chip is disposed, and avoids an application area of the resin coat;
It is provided with.

A display device according to a second aspect of the present invention includes:
A display panel including an effective display unit configured by a plurality of display pixels;
A flexible wiring board connected to the display panel;
A driving IC chip that is disposed on an outer peripheral portion located outside the effective display portion on the surface of the display panel and outputs a driving signal for driving each display pixel in the effective display portion;
A resin coat applied to a gap between the display panel and the flexible wiring board;
A backlight unit that illuminates the display panel from the back side;
A housing for holding the display panel and the backlight unit;
A light-shielding medium arranged in the housing and shielding the area corresponding to the arrangement position of the drive IC chip from the back side of the display panel and avoiding the application area of the resin coat;
It is provided with.

  According to the present invention, it is possible to provide a highly reliable display device that can be reduced in thickness without causing a decrease in manufacturing yield.

  A display device according to an embodiment of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, a liquid crystal display device as an example of a display device includes a liquid crystal display panel 100 having a substantially rectangular flat plate shape. That is, the liquid crystal display panel 100 includes a pair of substrates, that is, an array substrate (first substrate) 200 and a counter substrate (second substrate) 300, a liquid crystal layer 400 held between the array substrate 200 and the counter substrate 300, It is constituted by.

  The array substrate 200 and the counter substrate 300 are bonded to each other by a sealing material 110, and a predetermined gap for holding the liquid crystal layer 400 is formed therebetween. The liquid crystal display panel 100 includes an effective display unit 120 that displays an image on the inner side surrounded by the sealing material 110. The effective display unit 120 includes a plurality of display pixels PX arranged in a matrix.

  The array substrate 200 includes a plurality of scanning lines Y (1, 2, 3,..., M) extending in the row direction of the display pixels PX and the column direction of the display pixels PX in the effective display unit 120. A plurality of extending signal lines X (1, 2, 3,..., N), a switch element 220 disposed at the intersection of the signal line X and the scanning line Y in each display pixel PX, and each display pixel PX And a pixel electrode 230 connected to the switch element 220.

  The gate electrode 222 of the switch element 220 is connected to the scanning line Y (or the gate electrode 222 is formed integrally with the scanning line Y). The source electrode 225 of the switch element 220 is connected to the signal line X (or the source 225 is formed integrally with the signal line X). The drain electrode 227 of the switch element 220 is connected to the pixel electrode 230.

  The counter substrate 300 includes a counter electrode 330 common to the plurality of display pixels PX in the effective display unit 120.

  Further, the liquid crystal display panel 100 includes a first connection part 131 and a second connection part 132 disposed on the outer peripheral part 130 located outside the effective display part 120 on the surface thereof. In the example shown in FIG. 1, the first connection portion 131 and the second connection portion 132 are disposed on the extending portion 200 </ b> A on the surface side of the array substrate 200 that extends outward from the end portion 300 </ b> A of the counter substrate 300. ing.

  The first connection unit 131 is connected to the drive IC chip 141 that functions as a signal supply source. The driving IC chip 141 outputs a driving signal for driving each display pixel PX in the effective display unit 120. The second connection part 132 is connected to a flexible wiring board that functions as a signal supply source. For example, the flexible wiring board supplies various control signals and power to the driving IC chip 141, and supplies various signals to the liquid crystal display panel 100.

  Each of the scanning lines Y (1, 2, 3,..., M) arranged in the effective display unit 120 is connected to the first connection unit 131 via the outer peripheral unit 130. Similarly, each of the signal lines X (1, 2, 3,..., N) is connected to the first connection portion 131 via the outer peripheral portion 130.

  On the back surface of the liquid crystal display panel 100, a light shielding medium, that is, a light shielding tape 150, which shields light from an area corresponding to the position where the driving IC chip 141 is disposed is disposed. In the example illustrated in FIG. 2, the light shielding tape 150 is disposed on the extending portion 200 </ b> A on the back surface side of the array substrate 200. The light shielding tape 150 is formed in a substantially strip shape, shields light from the back side of the liquid crystal display panel 100 toward the drive IC chip 141, and is adhered to the array substrate 200.

  In addition, on the back side of the liquid crystal display panel 100, a resin coat 160 applied so as to fill a gap between the liquid crystal display panel 100 and the flexible wiring board 142 is disposed. That is, as shown in FIG. 3, the flexible wiring board 142 includes a base material 142A, a conductor layer 142B such as various wirings arranged on the base material 142A, a cover layer 142C covering the conductor layer 142B, and the like. The connecting portion 142D of the flexible wiring board 142 is not covered with the cover layer 142C and the conductor layer 142B is exposed in order to enable connection with the second connecting portion 132 of the liquid crystal display panel 100.

  The connection part 142D is formed wide to ensure a connection margin with the second connection part 132, and a part of the conductor layer 142B is exposed even after the connection part 142D is connected to the second connection part 132. . For this reason, a short circuit occurs when conductive foreign matter is caught in the exposed portion of the conductor layer 142B, corrosion occurs due to condensation, and the flexible wiring board 142 is peeled off or damaged starting from the connecting portion 142D. . Therefore, as a countermeasure against these problems, the resin coat 160 is applied to the gap formed between the liquid crystal display panel 100 and the flexible wiring board 142, that is, the connecting portion 142D where the conductor layer 142B is mainly exposed.

  In the configuration as described above, the light shielding tape 150 is formed in a shape that avoids the application region of the resin coat 160 as shown in FIG. Here, the application area corresponds to an area when the applied resin coat 160 is cured. That is, the resin coat 160 is applied along the edge 100E of the liquid crystal display panel 100 that overlaps the flexible wiring board 142 (here, corresponding to the edge 200E of the array substrate 200). At this time, the resin coat 160 tends to be excessively applied at the application start point 161 and the application end point 162.

  Therefore, the applied resin coat 160 may run on the array substrate 200 beyond the edge 100E of the liquid crystal display panel 100. In particular, when the resin coat 160 is disposed along the edge 200E of the array substrate 200 formed using a glass substrate having a thickness of 0.2 mm or less, the resin coat 160 is applied to the array substrate 200 at the application start point 161 and the application end point 162. Easy to get on.

  When the resin coat 160 rides on the light shielding tape 150 disposed on the array substrate 200, a convex portion 170 having a locally increased thickness is formed as shown in FIG. When the liquid crystal display panel 100 having such a convex portion 170 is mounted on the housing 500, when the flexible wiring board 142 is bent, the convex portion 170 serves as a fulcrum, and stress tends to concentrate. For this reason, the array substrate 200 may be damaged.

  Therefore, in this embodiment, the light shielding tape 150 has a shape that avoids the region where the resin coat 160 is applied, and even if the resin coat 160 rides on the array substrate 200, the resin covers the light shielding tape 150. The coat 160 is configured not to ride up. As a result, a portion where the thickness is locally increased is not formed, and it is possible to prevent the array substrate 200 from being damaged when the flexible wiring substrate 142 is bent.

  More specifically, as shown in FIG. 2, the light shielding tape 150 has notches 151 and 152 that avoid application regions corresponding to the application start point 161 and the application end point 162 of the resin coat 160. When the resin coat 160 is arranged along the edge 200E of the array substrate 200, the vicinity of both ends of the edge 200E becomes the application start point 161 and the application end point 162, respectively. On side 150E along 200E, notches 151 and 152 are provided at both ends thereof. With such a configuration, it is possible to prevent the resin coat 160 from running on the light shielding tape 150.

  Although it is desirable that the resin coat 160 does not run on the array substrate 200, even if the resin coat 160 is run, it does not have to be a fulcrum where stress is concentrated when the flexible wiring board 142 is bent. That is, as shown in FIG. 5, the light shielding tape 150 is arranged on the array substrate 200, but the maximum thickness 160T of the resin coat 160 riding on the array substrate 200 is 150 T or less than the thickness of the light shielding tape 150. I just need it. In other words, since the thickness 150T of the light shielding tape 150 is about 100 μm, the maximum thickness 160T of the resin coat 160 riding on the array substrate 200 may be 100 μm or less. With such a configuration, even if the resin coat 160 rides on the array substrate 200, the array substrate 200 can be prevented from being damaged.

  In the above-described embodiment, the light shielding tape 150 is bonded to the liquid crystal display panel 100, but is not necessarily limited to this configuration. As shown in FIG. 6, the liquid crystal display device including the backlight unit BL that illuminates the transmissive liquid crystal display panel 100 from the back side includes a housing 500 that holds the backlight unit BL together with the liquid crystal display panel 100. Yes.

  The backlight unit BL includes a flat light guide 610, a light source unit 620 disposed along the edge of the light guide 610, and a first optical element disposed between the light guide 610 and the liquid crystal display panel 100. 630, a second optical element 640 disposed on the back side of the light guide 610, and the like.

  The light guide 610 is arranged such that one main surface (front surface) 611 faces the liquid crystal display panel 100. The light source unit 620 includes a light source such as a light emitting diode (LED) or a cold cathode tube, and includes a reflector that surrounds the light source as necessary. The first optical element 630 gives predetermined optical characteristics to the light emitted from the main surface 611 of the light guide 610. The first optical element 630 includes a diffusion sheet that imparts diffusibility, a lens sheet that imparts light condensing properties, and an optical sheet having a brightness enhancement function. The second optical element 640 includes a reflection sheet that reflects the light emitted from the other main surface (back surface) 612 of the light guide 610 toward the light guide 610.

  The housing 500 has a recess 501 having a dimension equivalent to the outer dimension of the liquid crystal display panel 100 (for example, the outer dimension of the array substrate 200), and holds the liquid crystal display panel 100 accommodated in the recess 501 via a double-sided tape or the like. Yes.

  In such a configuration, the light shielding tape 150 is disposed in the housing 500. In other words, the light shielding tape 150 is bonded to the concave portion 501 and configured to shield an area corresponding to the arrangement position of the drive IC chip 141 from the back side of the liquid crystal display panel 100 accommodated in the concave portion 501. Even with such a configuration, the same effect as the above-described embodiment can be obtained.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the spirit of the invention in the stage of implementation. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

FIG. 1 schematically shows a configuration of a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a plan view schematically showing the configuration of the back side of the liquid crystal display device shown in FIG. FIG. 3 is a diagram schematically showing a cross-sectional structure when the liquid crystal display device shown in FIG. 2 is cut along line AA. FIG. 4 is a diagram for explaining the operation of the convex portion formed when the resin coat rides on the light shielding tape. FIG. 5 is a diagram for explaining the relationship between the thickness of the light shielding tape and the thickness of the resin coat on the array substrate. FIG. 6 is a cross-sectional view schematically showing the configuration of a liquid crystal display device according to another embodiment.

Explanation of symbols

PX ... Display pixel Y ... Scanning line X ... Signal line BL ... Backlight unit 100 ... Liquid crystal display panel 100E ... Edge 110 ... Sealing material 120 ... Effective display part 141 ... Drive IC chip 142 ... Flexible wiring board 142A ... Base material 142B ... Conductor layer 142C ... cover layer 142D ... connection part 150 ... light shielding tape 151 ... notch part 152 ... notch part 160 ... resin coat 161 ... application start point 162 ... application end point 500 ... housing 501 ... concave part

Claims (7)

A display panel including an effective display unit configured by a plurality of display pixels;
A flexible wiring board connected to an outer peripheral part located outside the effective display part on the surface of the display panel;
A driving IC chip that is disposed on the outer periphery of the display panel and outputs a driving signal for driving each display pixel in the effective display unit;
A resin coat applied to a gap between the display panel and the flexible wiring board;
A light-shielding medium that is disposed on the back surface of the display panel, shields light from an area corresponding to the position where the drive IC chip is disposed, and avoids an application area of the resin coat;
A display device comprising: A display panel including an effective display unit configured by a plurality of display pixels;
A flexible wiring board connected to the display panel;
A driving IC chip that is disposed on an outer peripheral portion located outside the effective display portion on the surface of the display panel and outputs a driving signal for driving each display pixel in the effective display portion;
A resin coat applied to a gap between the display panel and the flexible wiring board;
A backlight unit that illuminates the display panel from the back side;
A housing for holding the display panel and the backlight unit;
A light-shielding medium disposed in the housing and configured to shield an area corresponding to an arrangement position of the drive IC chip from a back surface side of the display panel and avoid an application area of the resin coat;
A display device comprising:   The display device according to claim 1, wherein the light-shielding medium has a cutout portion that avoids an application region corresponding to an application start point and an end point of the resin coat.   2. The light shielding medium according to claim 1, wherein the light shielding medium has a substantially strip shape, and has cutout portions at both ends thereof on a side of the light shielding medium along an edge of the display panel overlapping the flexible wiring board. 2. The display device according to 2.   3. The display device according to claim 1, wherein a thickness of the resin coat in a coating region on a back surface of the display panel is equal to or less than a thickness of the light shielding medium.   3. The display device according to claim 1, wherein a thickness of the resin coat in a coating region is 100 μm or less on a back surface of the display panel.   The display device according to claim 1, wherein the display panel is a liquid crystal display panel in which a liquid crystal layer is held between a pair of substrates.

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