JP2010078646A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To thin a liquid crystal display device, and to stabilize the luminance of the screen of the liquid crystal display device. <P>SOLUTION: A backlight including a light guide plate 70 and an optical sheet group 76 is arranged on the back surface of a liquid crystal display panel. A light emitting diode 50 used as a light source is arranged on a side surface of the light guide plate 70 in such a state that it is suspended by a flexible wiring board 40 for the light emitting diode. When a main flexible wiring board 30 connected to the liquid crystal display panel is bent on the back surface of a mold 60, the liquid crystal display panel may rise from the mold 60 by a spring force of the flexible wiring board 30. A spacer 90 stuck to the flexible wiring board 40 for the light emitting diode is not stuck to the liquid crystal display panel, so that the position of the light emitting diode 50 is not moved by the motion of the liquid crystal display panel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a small-sized liquid crystal display device used for a cellular phone or the like, and more particularly to a liquid crystal display device having a small thickness and a stable screen luminance.

  In a liquid crystal display device, a TFT substrate in which pixel electrodes and thin film transistors (TFTs) are formed in a matrix, and a color filter substrate in which color filters and the like are formed at locations corresponding to the pixel electrodes of the TFT substrate facing the TFT substrate The liquid crystal is sandwiched between the TFT substrate and the color filter substrate. An image is formed by controlling the light transmittance of the liquid crystal molecules for each pixel.

  Since the liquid crystal display device can be made small and thin, it is used in various applications such as a cellular phone. Cellular phones and the like are required to further reduce the thickness of the device, and for this reason, it is required to make the liquid crystal display panel thinner. Here, the liquid crystal display panel is a liquid crystal display panel in which a liquid crystal is sandwiched between a TFT substrate and a color filter substrate, a lower polarizing plate is attached below the TFT substrate, and an upper polarizing plate is attached on the color filter substrate.

  In order to make the liquid crystal display panel thinner, after the liquid crystal display panel is manufactured, the outside of the liquid crystal display panel is polished to make it thinner. A glass substrate of a color filter substrate on which a pixel electrode, a TFT (Thin Film Transistor), etc. forming a liquid crystal display panel are formed, or a color filter substrate is 0.5 mm or 0.7 mm, for example. It has been standardized. It is difficult to obtain these standardized glass substrates from the market. In addition, a very thin glass substrate causes problems due to mechanical strength, bending, and the like in the manufacturing process, and decreases the manufacturing yield. As a result, after forming a liquid crystal display panel using a standardized glass substrate, the outer surface of the liquid crystal display panel is polished and thinned.

  Such a liquid crystal display panel is placed in a mold containing a backlight. A light emitting diode is used as the light source of the backlight. A flexible wiring board that supplies power, scanning signals, video signals, etc. is attached to the liquid crystal display panel, and the flexible wiring board is folded at the end of the mold and extends to the back of the mold in order to reduce the external shape of the liquid crystal display device. Let The light emitting diode is attached to a portion extending on the back surface of the flexible wiring board, and is attached to face the end portion of the light guide plate of the backlight.

  Thus, when the flexible wiring board is folded back to the back of the mold, the spring force of the flexible wiring board causes a force to peel off the liquid crystal display panel from the mold, or the light emitting diode is likely to move from the end of the light guide plate. The power that works. In “Patent Document 1”, in order to solve the problem due to the repulsive force of such a flexible wiring board, a pin is provided on a side portion of the mold, and a hole formed in the flexible wiring board is hooked on this pin, thereby the flexible wiring board. A configuration is described in which the above-described problems are solved by suppressing the sagging.

JP 2007-133756 A

  The technique described in “Patent Document 1” is a configuration in which a light emitting diode 50 is attached to a main flexible wiring board 30 that supplies power, video signals, scanning signals, and the like to a liquid crystal display panel. On the other hand, the light emitting diode 50 is not attached to the main flexible wiring board 30, but is attached to the light emitting diode flexible wiring board 40, whereby the light emitting diode 50 is stably disposed at the end of the light guide plate 70 of the backlight. Exists.

  FIG. 10 is a perspective view in which the light emitting diode 50 is attached to the flexible wiring substrate 40 for light emitting diode. In FIG. 10, the light emitting diode 50 is attached in such a manner that it is suspended from the flexible wiring board 40 for light emitting diode. The light-emitting diode flexible wiring board 40 includes an attachment portion 41 to which the light-emitting diode 50 is attached, a drawer portion 42 and a connector portion 43. In the light emitting diode flexible wiring substrate 40, the attachment portion 41 is accommodated in the mold 60, and the lead-out portion 42 and the connector portion 43 are disposed outside the mold 60.

  FIG. 11 is a cross-sectional view showing a state in which the light-emitting diode flexible wiring board 40 to which the light-emitting diode 50 shown in FIG. 10 is attached is incorporated in the liquid crystal display device. In FIG. 11, a liquid crystal display panel including a TFT substrate 10, a color filter substrate 20, and the like is placed on a mold 60. The mold 60 accommodates a backlight including a light guide plate 70, a reflection sheet 71, an optical sheet group 76, and the like.

  The light-emitting diode 50 attached to the light-emitting diode flexible wiring substrate 40 is disposed at the end of the light guide plate 70 and constitutes a part of the backlight. The light from the light emitting diode 50 enters the side surface of the light guide plate 70 and is directed toward the liquid crystal display panel by the light guide plate 70. In addition, the reflection sheet 71 disposed under the light guide plate 70 has a role of reflecting light directed downward from the light guide plate 70 toward the liquid crystal display panel.

  Here, the flexible wiring board 40 for light emitting diodes is bonded to the portion of the mold 60 that has a bowl shape. Therefore, even if the light-emitting diode flexible wiring board 40 is bent outside the mold 60 or the main flexible wiring board 30 is bent behind the mold 60, the position of the light-emitting diode 50 is fixed and stable. It can be used as a light source.

  However, there is an increasing demand for thin liquid crystal display devices. In the case of the configuration as shown in FIG. 11, the mold 60 needs to be bent to bond the light emitting diode flexible wiring substrate 40 to the mold 60, so there is a limit to making the liquid crystal display device thin.

  An object of the present invention is to use a light-emitting diode flexible wiring substrate 40 of a type that suspends the light-emitting diode 50, and to make the liquid crystal display panel thin without forming a ridge on the mold 60. It is to arrange stably at the end portion of the light guide plate 70 and stably maintain the brightness of the screen.

  The present invention solves the problems as described above, and specific means are as follows.

  (1) A liquid crystal display panel having a TFT substrate in which pixels including pixel electrodes and TFTs are formed in a matrix and a color filter substrate on which a color filter is formed, and a liquid crystal display device having a backlight housed in a mold. A main flexible wiring board connected to the liquid crystal display panel and extending to a back surface of the mold; the liquid crystal display panel is placed on the mold; and the backlight includes a light guide plate and the light guide plate. A light emitting diode disposed opposite to a side surface, wherein the light emitting diode is connected to a flexible wiring substrate for the light emitting diode, the light emitting diode is present in a form suspended from the flexible wiring substrate for the light emitting diode, and the light emitting diode The flexible wiring board for the diode and the liquid crystal display panel are mutually connected in the mold. The liquid crystal display apparatus characterized by not fixed to.

  (2) The liquid crystal display according to (1), wherein a spacer exists between the flexible wiring substrate for light emitting diodes and the liquid crystal display panel, and the spacer is not bonded to the liquid crystal display panel. apparatus.

  (3) The liquid crystal display device according to (1), wherein the spacer is bonded to the flexible wiring substrate for the light emitting diode.

  (4) A liquid crystal display device having a TFT substrate on which pixels including pixel electrodes and TFTs are formed in a matrix and a color filter substrate on which a color filter is formed, and a backlight housed in a mold. The liquid crystal display panel is connected to a main flexible wiring board and extends to the back surface of the mold, the liquid crystal display panel is fixed to the mold by a first double-sided adhesive material, and the backlight is guided. A light emitting diode disposed opposite to a side surface of the light plate and the light guide plate, the light emitting diode is connected to a flexible wiring substrate for the light emitting diode, and the flexible wiring substrate for the light emitting diode has a width to which the light emitting diode is attached; A wide attachment section and a narrower pull than the attachment section extending out of the mold. The light-emitting diode is present in a form suspended from the light-emitting diode flexible wiring substrate, and the light-emitting diode flexible wiring substrate is bent at the lead-out portion and extends to the back surface of the mold. The light emitting diode flexible wiring board and the liquid crystal display panel are not fixed to each other in the mold.

  (5) The liquid crystal display according to (4), wherein a spacer exists between the flexible wiring substrate for light emitting diodes and the liquid crystal display panel, and the spacer is not bonded to the liquid crystal display panel. apparatus.

  (6) The liquid crystal display device according to (4), wherein the spacer is bonded to the flexible wiring substrate for the light emitting diode.

  According to the present invention, since there is no wrinkle that is a part of the mold between the liquid crystal display panel and the light emitting diode, the liquid crystal display device can be made thin. In addition, the light emitting diode is connected to the light emitting diode flexible wiring substrate separately from the main flexible wiring substrate, and the light emitting diode flexible wiring substrate and the liquid crystal display panel are not attached with a double-sided adhesive material or the like in the mold. Therefore, the movement of the liquid crystal display panel is not transmitted to the light emitting diode. That is, since the movement of the liquid crystal display panel and the light emitting diode are interrupted, the positional relationship between the light emitting diode and the light guide plate is stabilized, and the screen luminance of the liquid crystal display device is also stabilized.

  In addition, a spacer for adjusting the height may be arranged between the liquid crystal display panel and the flexible wiring substrate for the light emitting diode. In this case, the spacer and the liquid crystal display panel are not adhered to each other, so that the liquid crystal display panel Therefore, the luminance of the liquid crystal display device can be stabilized.

  The contents of the present invention will be described in detail below using examples.

  FIG. 1 is a plan view of a liquid crystal display device to which the present invention is applied. In FIG. 1, a liquid crystal display panel is placed in a frame of a mold 60. The liquid crystal display panel is fixed to the mold 60 with a first double-sided adhesive material 81. An upper polarizing plate 21 is attached to the color filter substrate 20 of the liquid crystal display panel. The TFT substrate 10 is formed to be larger than the color filter substrate 20, and the terminal portion 17 is formed in the enlarged portion, the IC driver 15 is attached to the terminal portion 17, and the main flexible wiring substrate 30 is attached. It has been. The main flexible wiring board 30 is bent at the end of the mold 60 and extends to the back surface of the mold 60.

  2 is a cross-sectional view taken along the line CC of FIG. In FIG. 2, two steps are formed inside the mold 60, and the liquid crystal display panel is fixed to the upper step through a first double-sided adhesive material 81. In FIG. 2, the CC cross section is a portion where one TFT substrate 10 is formed, so that only the TFT substrate 10 is described in the liquid crystal display panel. An IC driver 15 is disposed on the TFT substrate 10.

  The flexible wiring board 40 for light emitting diodes is fixed to the lower step portion of the mold 60 by a second double-sided adhesive material 82. In the CC cross section, there is no optical component except for the light emitting diode 50. The optical component is present in the z direction in FIG. 2, that is, vertically below the paper surface, but is not visible because the mold 60 and the light emitting diode 50 are present.

  In FIG. 2, the light-emitting diode 50 is bonded to the light-emitting diode flexible wiring board 40 on the upper side, and is suspended by the light-emitting diode flexible wiring board 40. The light-emitting diode flexible wiring board 40 extends to the front side in the direction perpendicular to the paper surface, and is connected to the main flexible wiring board 30 (not shown) at the end of the mold 60 and bent to the back surface of the mold 60.

  In FIG. 2, the lower polarizing plate 11 is disposed under the TFT substrate 10. However, since the lower polarizing plate 11 is disposed only in the display region, it is described in FIG. 2, which is a cross-sectional view of the terminal portion 17. It has not been. In the portion where the TFT substrate 10 becomes one, a spacer 90 is installed between the TFT substrate 10 and the flexible wiring substrate 40 for the light emitting diode in order to align the lower surface with the lower polarizing plate 11 formed in the display region. Yes. A third double-sided adhesive material 91 is formed on the lower side of the spacer 90, and the spacer 90 and the light-emitting diode flexible wiring board 40 are bonded to each other. The spacer 90 is installed for position adjustment with the optical component of the backlight, and the thickness may be small. In some cases, the spacer 90 may not exist.

  The feature of the present invention is that the spacer 90 and the TFT substrate 10 are not bonded on the upper side of the spacer 90 and can freely slide on each other at this interface. As will be described later, when the spacer 90 and the TFT substrate 10 are bonded, even if the TFT substrate 10 moves slightly due to the repulsive force of the main flexible wiring substrate 30, for example, the spacer 90 It is not affected and does not move.

  Since the spacer 90 is bonded to the light emitting diode flexible wiring substrate 40 that suspends the light emitting diode 50, if the spacer 90 moves together with the TFT substrate 10, the light emitting diode 50 also moves, and the light guide plate The distance to the end of 70 changes, or the parallelism with the end of the light guide plate 70 cannot be maintained. Such a problem does not occur in the present invention.

  3 is a cross-sectional view taken along the line BB of FIG. In FIG. 3, the liquid crystal display panel includes a TFT substrate 10, a color filter substrate 20, a lower polarizing plate 11, and an upper polarizing plate 21. The TFT substrate 10 constituting the liquid crystal display panel is bonded to the step portion of the mold 60 by the first double-sided adhesive material 81. An IC driver 15 is installed on the terminal portion 17 of the TFT substrate 10, and a main flexible wiring substrate 30 is connected thereto.

  An optical sheet group 76, a light guide plate 70, and a reflection sheet 71 are installed on the lower side of the liquid crystal display panel. In the cross section of FIG. 3, the light emitting diode 50 does not exist. The configuration of optical components in the backlight is as follows. In FIG. 3, a reflection sheet 71 is disposed below the light guide plate 70. This is because the light traveling downward from the light guide plate 70 is reflected and directed toward the liquid crystal display panel. On the other hand, an optical sheet group 76 including a lower diffusion sheet 72, a lower prism sheet 73, an upper prism sheet 74, and an upper diffusion sheet 75 is disposed above the light guide plate 70.

  FIG. 13 is an exploded perspective view of the optical sheet group 76. In FIG. 13, the lowermost side is the lower diffusion sheet 72. The light emitted from the light guide plate 70 toward the liquid crystal display panel has uneven brightness such that the vicinity of the light emitting diode 50 is relatively bright, but the lower diffusion sheet 72 reduces such uneven brightness. , Form a uniform backlight.

  A lower prism sheet 73 is disposed on the lower diffusion sheet 72. In the lower prism sheet 73, for example, as shown in FIG. 13, prisms having a triangular cross section extend in the horizontal direction and are arranged in the vertical direction. The pitch of each prism is about 50 μm. In FIG. 5, the lower prism sheet 73 has a role of increasing the light utilization efficiency by directing light that is about to spread in the direction a to the vertical direction of the lower prism sheet 73.

  An upper prism sheet 74 is disposed on the lower prism sheet 73. In the upper prism sheet 74, for example, as shown in FIG. 13, prisms having a triangular cross section extend in the vertical direction and are arranged in the horizontal direction. The pitch of each prism is about 50 μm. In FIG. 5, the upper prism sheet 74 has a role of increasing the light use efficiency by directing light that is going to spread in the b direction in the vertical direction of the upper prism sheet 74.

  In FIG. 13, the upper diffusion sheet 75 is disposed on the upper prism sheet 74. The upper diffusion sheet 75 has a function of suppressing the generation of moire on the screen of the liquid crystal display device. That is, the light emitted from the lower prism sheet 73 or the upper prism sheet 74 is microscopically changed in brightness periodically corresponding to the prism pitch.

  On the other hand, on the TFT substrate 10 of the liquid crystal display panel, for example, scanning lines extend in the horizontal direction and are arranged in the vertical direction. Accordingly, a portion that periodically transmits light and a portion that shields light are generated in the vertical direction by the scanning line. The video signal lines extend in the vertical direction and are arranged in the horizontal direction. Therefore, a portion that periodically transmits light in the horizontal direction and a portion that blocks light are generated by the video signal line.

  If it does so, interference of light will arise between the light which passed the lower prism sheet 73 and the upper prism sheet 74, and the TFT substrate 10 of a liquid crystal display panel, and a moire will generate | occur | produce. The upper diffusion sheet 75 has a role of suppressing the occurrence of moire by relaxing the intensity of light transmitted through the prism sheet, thereby mitigating interference with the scanning lines or video signal lines formed on the TFT substrate 10. ing.

  Returning to FIG. 3, the optical sheet group 76 is overlaid on the light guide plate 70. An interval of about 50 μm is provided between the upper diffusion sheet 75 at the top of the optical sheet group 76 and the lower polarizing plate 11 of the liquid crystal display panel. This is to prevent the lower polarizing plate 11 and the upper diffusion sheet 75 from rubbing and causing scratches.

  In FIG. 3, a spacer 90 is disposed below the terminal portion 17 of the TFT substrate 10. A third double-sided pressure-sensitive adhesive material 91 is formed below the spacer 90, and the third double-sided pressure-sensitive adhesive material 91 and the light-emitting diode flexible wiring substrate 40 are bonded to each other. As described above, the light-emitting diode flexible wiring substrate 40 is fixed to the mold 60, but is not fixed to the TFT substrate 10. Therefore, the flexible wiring substrate 40 for light emitting diodes is not affected by the movement of the TFT substrate 10.

  4 is a cross-sectional view taken along the line AA in FIG. In FIG. 4, the configuration of the liquid crystal display panel and the configuration of the optical components in the backlight are as described in FIG. In the cross section of FIG. 4, the liquid crystal display panel is not bonded to the mold 60. A light emitting diode flexible wiring substrate 40 extends outward from between the liquid crystal display panel and the mold 60, is bent together with the main flexible wiring substrate 30, and is bent to the back surface of the mold 60.

  A portion where the flexible wiring board 40 for light emitting diodes extends to the outside of the mold 60 is a lead-out portion 42 shown in FIG. Therefore, even if the flexible wiring board 40 for light emitting diodes is lifted, the springback force is small and does not cause the spacer 90 or the light emitting diode 50 to move.

  In FIG. 4, the main flexible wiring substrate 30 connected to the TFT substrate 10 is bent at the end of the mold 60 and extends to the back surface of the mold 60. Since the main flexible wiring board 30 is formed with many wirings for power supply, video signal, scanning signal, etc., the width is large as shown in FIG. Therefore, when the main flexible wiring board 30 is bent, a spring force is generated so that the TFT substrate 10 is peeled off from the mold 60.

  In order to reduce the thickness of the liquid crystal display device to which the present invention is applied, the area where the liquid crystal display panel and the mold 60 are bonded is small as shown in FIG. Then, as shown in FIG. 4, a phenomenon occurs in which the liquid crystal display panel separates from the mold 60 and floats due to the spring force of the main flexible wiring board 30. FIG. 4 is an exaggerated depiction of this phenomenon, and the amount by which the liquid crystal display panel is lifted is small, and there is no problem in visibility.

  In the present invention, since the liquid crystal display panel and the spacer 90 are not bonded, even if the liquid crystal display panel may float from the mold 60, the spacer 90 and the flexible wiring substrate 40 for light emitting diode bonded to the spacer 90 are used. And the light emitting diode 50 is not affected. Accordingly, since the relative distance between the light guide plate 70 and the light emitting diode 50 or the parallelism between the side surface of the light guide plate 70 and the light emitting diode 50 does not change, the light incident on the light guide plate 70 from the light emitting diode 50 does not change. The screen brightness is stably maintained.

  The distance between the light guide plate 70 and the light emitting diode 50 in FIG. 1 greatly affects the brightness of the screen. For example, when the distance d between the light guide plate 70 and the light emitting diode 50 is increased by 0.1 mm, the brightness of the screen is reduced by about 10%. As described above, since the slight movement of the light emitting diode 50 greatly affects the screen brightness, the present invention has a great effect in stabilizing the screen brightness.

Comparative example

  5 to 9 show comparative examples when the present invention is not used. FIG. 5 is a view corresponding to the CC cross section of FIG. FIG. 5 shows a configuration similar to that of FIG. 2 in the present invention except that the first double-sided adhesive material 81 for bonding the TFT substrate 10 and the mold 60 is widely formed and the TFT substrate 10 and the spacer 90 are also bonded. It has become. In FIG. 5, the liquid crystal display panel, the spacer 90, and the light emitting diode 50 are integrated through a first double-sided adhesive material 81. Accordingly, the movement of the liquid crystal display panel becomes the movement of the light emitting diode 50 as it is.

  FIG. 6 is a diagram corresponding to the BB cross section of FIG. 1. In FIG. 6, the liquid crystal display panel is bonded to the mold 60 by the first double-sided adhesive material 81 and is also bonded to the spacer 90. The point that the first double-sided adhesive material 81 is also bonded to the spacer 90 is different from FIG. 3 showing the invention. Therefore, in FIG. 6, the light-emitting diode flexible wiring substrate 40 and the liquid crystal display panel are integrated via the first double-sided adhesive material 81.

  FIG. 7 is a portion corresponding to the AA cross section of FIG. In the cross section of FIG. 7, the liquid crystal display panel is not bonded to the mold 60. A light emitting diode flexible wiring substrate 40 extends outwardly between the liquid crystal display panel and the mold 60. In FIG. 7, the liquid crystal display panel and the spacer 90 are bonded via a first double-sided adhesive material 81. Since the spacer 90 and the light-emitting diode flexible wiring substrate 40 are bonded via the third double-sided adhesive material 91, the liquid crystal display panel and the light-emitting diode 50 have an integral structure. In FIG. 7, the main flexible wiring board 30 and the light-emitting diode flexible wiring board 40 are connected at a portion C.

  FIG. 8 is a cross-sectional view showing a state where the main flexible wiring board 30 and the light-emitting diode flexible wiring board 40 shown in FIG. FIG. 8 shows a state in which the main flexible wiring board 30 and the light-emitting diode flexible wiring board 40 are bent slightly, so that the liquid crystal display panel is not yet subjected to great stress. As shown in FIG. 5, the liquid crystal display panel and the mold 60 are bonded by a first double-sided adhesive material 81. When the bending stress as shown in FIG. 8 is still small, the TFT substrate 10 of the liquid crystal display panel is fixed to the mold 60 by the first double-sided adhesive material 81.

  FIG. 9 shows an example in which the main flexible wiring board 30 is further bent to be brought into close contact with the back surface of the mold 60. In this case, the stress caused by the main flexible wiring board 30 on the liquid crystal display panel is further increased, and the liquid crystal display panel is peeled off from the mold 60. As shown in FIG. 5, since the adhesion area of the liquid crystal display panel and the mold 60 by the first double-sided adhesive material 81 is small, the adhesive force of the first double-sided adhesive material 81 alone cannot withstand the peeling stress by the flexible wiring board. The phenomenon that occurs.

  A white arrow D in FIG. 9 indicates a phenomenon that the liquid crystal display panel is lifted from the mold 60 due to the stress of the flexible wiring board. By the way, in the flexible wiring board 40 for light emitting diodes in FIG. 9, the drawer portion 42 drawn out to the outside of the mold 60 has a small width, so that stress that peels the liquid crystal display panel from the mold 60 does not occur.

  In FIG. 9, when the liquid crystal display panel is peeled off from the mold 60 and moved as indicated by the white arrow D in the figure, the light emitting diode 50 is similarly separated from the end face of the light guide plate 70. That is, since the spacer 90 and the light emitting diode 50 are integrated with each other through the first double-sided adhesive material 81, the movement of the liquid crystal display panel and the light emitting diode 50 move in conjunction with each other.

  In FIG. 9, even if the liquid crystal display panel has a small amount of floating and does not cause a big problem in the visibility of the display area formed on the liquid crystal display panel, the effect of even a slight movement of the light emitting diode 50 is not affected. large. That is, the brightness of the screen is reduced by about 10% just by increasing the distance between the light emitting diode 50 and the light guide plate 70 by about 0.1 mm.

  On the other hand, as shown in FIG. 4, in the present invention, the liquid crystal display panel, the spacer 90, and the flexible wiring substrate 40 for light emitting diodes are not bonded. It is separated. Therefore, the influence of the movement of the liquid crystal display panel due to the spring force generated when the main flexible wiring board 30 is bent can be prevented.

  By the way, the phenomenon that the liquid crystal display panel moves with respect to the mold 60 does not occur only when the main flexible wiring board 30 is bent, but occurs due to various other causes. When the liquid crystal display panel and the spacer 90 or the light emitting diode 50 are integrated via the first double-sided adhesive material 81, the position of the light emitting diode 50 moves in conjunction with these movements of the liquid crystal display panel. Accordingly, the brightness of the screen of the liquid crystal display device changes.

  In contrast, in the present invention, the liquid crystal display panel is not bonded to the spacer 90 or the light emitting diode 50, and the movement of the liquid crystal display panel and the movement of the light emitting diode 50 are not linked. Does not affect the brightness of the screen. Therefore, it is possible to realize a liquid crystal display device having a stable screen luminance and a small thickness.

It is a top view of the liquid crystal display device with which this invention is applied. It is CC sectional drawing of FIG. It is BB sectional drawing of FIG. It is AA sectional drawing of FIG. It is CC sectional drawing of FIG. 1 in a comparative example. It is BB sectional drawing of FIG. 1 in a comparative example. It is AA sectional drawing of FIG. 1 in a comparative example. In FIG. 7, it is sectional drawing at the time of bending the main flexible wiring board lightly. In FIG. 8, it is sectional drawing at the time of bending until the main flexible wiring board contacts a mold back surface. It is a perspective view which shows the state by which the light emitting diode was attached to the flexible wiring board for light emitting diodes. It is AA sectional drawing of FIG. 1 in a prior art example. It is a disassembled perspective view of an optical sheet group.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... TFT substrate, 11 ... Lower polarizing plate, 15 ... IC driver, 17 ... Terminal part, 20 ... Color filter substrate, 21 ... Upper polarizing plate, 30 ... Main flexible wiring board, 40 ... Flexible wiring board for light emitting diodes, 41 DESCRIPTION OF SYMBOLS ... Attachment part 42 ... Drawer part 43 ... Connector part 50 ... Light emitting diode 60 ... Mold 70 ... Light guide plate 71 ... Reflective sheet 72 ... Lower diffusion sheet 73 ... Lower prism sheet 74 ... Upper prism sheet 75 ... Upper diffusion sheet, 76 ... Optical sheet group, 80 ... Spacer, 81 ... First double-sided adhesive material, 82 ... Second double-sided adhesive material, 90 ... Spacer, 91 ... Third double-sided adhesive material.

Claims (6)

A liquid crystal display device having a liquid crystal display panel having a TFT substrate on which pixels including pixel electrodes and TFTs are formed in a matrix and a color filter substrate on which a color filter is formed, and a backlight housed in a mold,
A main flexible wiring board is connected to the liquid crystal display panel and extends to the back of the mold.
The liquid crystal display panel is placed on the mold,
The backlight includes a light guide plate and a light emitting diode disposed to face a side surface of the light guide plate,
The light emitting diode is connected to a flexible wiring board for light emitting diodes, and the light emitting diode is present in a form suspended from the flexible wiring board for light emitting diodes,
The liquid crystal display device, wherein the light-emitting diode flexible wiring substrate and the liquid crystal display panel are not fixed to each other in the mold.   The liquid crystal display device according to claim 1, wherein a spacer exists between the flexible wiring board for light emitting diodes and the liquid crystal display panel, and the spacer is not bonded to the liquid crystal display panel.   The liquid crystal display device according to claim 1, wherein the spacer is adhered to the flexible wiring substrate for the light emitting diode. A liquid crystal display device having a liquid crystal display panel having a TFT substrate on which pixels including pixel electrodes and TFTs are formed in a matrix and a color filter substrate on which a color filter is formed, and a backlight housed in a mold,
A main flexible wiring board is connected to the liquid crystal display panel and extends to the back of the mold.
The liquid crystal display panel is fixed to the mold by a first double-sided adhesive material,
The backlight includes a light guide plate and a light emitting diode disposed to face a side surface of the light guide plate,
The light-emitting diode is connected to a flexible wiring board for light-emitting diodes, and the flexible wiring board for light-emitting diodes is wider than a mounting part that attaches the light-emitting diode, and the mounting part that extends outward from the mold. With a narrow drawer
The light emitting diode exists in a form suspended from the flexible wiring substrate for the light emitting diode,
The light-emitting diode flexible wiring board is bent at the drawer and extends to the back of the mold,
The liquid crystal display device, wherein the light-emitting diode flexible wiring substrate and the liquid crystal display panel are not fixed to each other in the mold.   5. The liquid crystal display device according to claim 4, wherein a spacer exists between the flexible wiring substrate for light emitting diodes and the liquid crystal display panel, and the spacer is not bonded to the liquid crystal display panel.   The liquid crystal display device according to claim 4, wherein the spacer is bonded to the flexible wiring substrate for the light emitting diode.

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