JP2009186788A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device having constitution capable of installing a liquid crystal panel of full FD, even in a thinned liquid crystal television. <P>SOLUTION: The liquid crystal display device includes a display panel, a plurality of flexible substrates connected to the display panel, a semiconductor chip mounted on the flexible substrate, a printed circuit board formed with a wire for transmitting a signal from outside, to the semiconductor chip, and connected to the printed circuit board, and a middle frame member for mounting the display panel, the middle frame member has a printed circuit board installing face arranged vertical-directionally with respect to a display face of the display panel. The printed circuit board installing face includes a printed circuit board fixing part for fixing one side of the printed circuit board, and a printed circuit board support part for arranging the printed circuit board with a space from the printed circuit board installing face. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a thin housing.

  In recent years, liquid crystal display devices are used in various products, and one of them is a liquid crystal television.

  A liquid crystal television is composed of various parts and modules. Generally, a display module centered on a display panel is a display panel made of a glass substrate having liquid crystal, and a back panel that irradiates the display panel with light. It consists of a light module, a display panel and a frame member that supports the backlight.

  In addition, the display panel includes a plurality of flexible substrates attached around the display panel and a printed circuit board on which wiring for connecting the flexible substrate and an external timing controller circuit (T-Con) substrate is formed. A semiconductor chip which is a drain driver or a source driver is formed on each flexible substrate. The display panel has a plurality of drain wirings and gate wirings, and these wirings are connected to a drain driver and a source driver. Therefore, the flexible substrate on which the drain driver and the source driver are formed needs to be directly connected to the display panel.

  Such a display module is assembled with a power supply substrate, a speaker, a liquid crystal television case, and the like to complete a liquid crystal television.

  In recent years, liquid crystal televisions are becoming narrower and thinner. Since display modules occupy a large position as components of liquid crystal televisions, with regard to narrowing and thinning of the display modules, further narrowing and thinning of the display modules are progressing. As one end, a flexible substrate or a printed circuit board connected to the display panel is bent and installed so as to be as close to the side surface or the back surface of the display panel as possible.

Examples of such a configuration are disclosed in Patent Document 1 and Patent Document 2 below, for example.
JP 2007-17893 A JP 2001-83897 A

  The above-mentioned Patent Document 1 discloses an example of fixing a printed circuit board.

  However, in the configuration of Patent Document 1, the printed board is fixed to the casing of the liquid crystal television. For this reason, the display panel module and the liquid crystal television casing are paired. For this reason, it is difficult to combine the display panel module with another liquid crystal television casing.

  Patent Document 2 discloses an example in which a printed board is fixed to a side surface of a display panel.

  However, in recent liquid crystal televisions, the pixels of the display panel have been increased in definition. For example, in the 37-inch size, WXGA (1280 × 768 pixels) to full HD (full specification HDTV (high definition television)) has been developed. The so-called 1920 x 1080 pixel is becoming popular.

  In recent years, the thickness of LCD TV cases has been further reduced, and a liquid crystal TV having a case where the thickness of the conventional case, which is 10 cm or more, is about 3 to 4 cm or less is provided. Has been.

  When the WXGA display panel and the full HD display panel are compared, there is a large difference in the number of pixels, and therefore the number of drain drivers and gate drivers and the number of wirings are inevitably larger in the full HD panel. In addition, the wiring connecting the flexible substrate and the timing controller circuit (T-Con) substrate is much more in the full HD panel. Therefore, the wiring on the printed board provided between the flexible board and the timing controller circuit (T-Con) board becomes very large, and the area of the printed board is inevitably increased. For example, a 37-inch printed circuit board has a width of about 10 mm for a WXGA panel, and a width of about 20 mm for a full HD panel.

  The printed circuit board is generally provided on the side surface of the display panel as shown in the above publication. Since the display panel includes a backlight module on the back surface, the conventional printed circuit board for the WXGA panel is disposed on the side surface of the backlight module. However, the printed circuit board for a full HD panel has a large area and protrudes larger than the backlight module.

  In addition, as the display module is made thinner, the backlight module is also made thinner. Therefore, installation of a large-sized printed circuit board is more difficult.

  A conventional LCD TV with a large depth has a margin in the depth direction, so even if the printed circuit board protrudes beyond the thickness of the display module, there were few problems in the installation environment of the display module. As the television becomes thinner and the depth becomes smaller, and the television housing becomes extremely thin, there arises a problem that it becomes difficult to install the display module in which the printed circuit board protrudes in the depth direction.

  An object of the present invention is to provide a liquid crystal display device in which a full HD display panel can be installed even in a thinned liquid crystal television case, and various liquid crystal televisions as a display panel module for full FD. An object of the present invention is to provide a liquid crystal display device compatible with a housing.

  The main features of the present invention are a display panel, a plurality of flexible boards connected to the display panel, a semiconductor chip mounted on the flexible board, and wiring for transmitting signals from the outside to the semiconductor chip. A liquid crystal display device including a printed circuit board formed and connected to the flexible substrate, and an intermediate frame member on which the display panel is placed, wherein the intermediate frame member is perpendicular to the display surface of the display panel A printed circuit board installation surface arranged in a direction, and on the printed circuit board installation surface, a printed circuit board fixing portion that fixes one side of the printed circuit board, and the printed circuit board is arranged apart from the printed circuit board installation surface. For providing a printed circuit board support.

  The flexible substrate includes a display panel, a flexible substrate connected to the display panel, a semiconductor chip mounted on the flexible substrate, and a wiring for transmitting an external signal to the semiconductor chip. A liquid crystal display device comprising a printed circuit board connected to the display panel and an intermediate frame member on which the display panel is placed, wherein the intermediate frame member is disposed in a vertical direction with respect to the display surface of the display panel A display panel mounting surface of the middle frame member; an upper frame member covering the printed circuit board mounting surface of the middle frame member; and a display panel mounting of the upper frame member and the middle frame member. There is a gap between the mounting surface and the printed board mounting surface of the upper frame member and the middle frame member, and the gap Wherein a reluctance substrate printed circuit board is disposed, and the printed circuit board is to be arranged obliquely with respect to the upper frame member in said gap.

  According to the above-described liquid crystal display device, a full HD display panel can be installed even in a thinned liquid crystal television case, and the full HD display panel module is compatible with various liquid crystal television cases. A possible liquid crystal display device can be realized.

  Embodiments of a liquid crystal display device according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic plan view showing a display panel PNL of a liquid crystal display device according to the present invention.

  The display panel PNL includes a substrate SUB1 and a substrate SUB2 that are disposed to face each other. A sealing material SL is formed in a rectangular shape between the substrate SUB1 and the substrate SUB2, and liquid crystal is sealed in a region surrounded by the sealing material SL. The inside of the sealing material SL is a display area AR where an image is displayed.

  In the surface of the substrate SUB1 on the liquid crystal side, a plurality of gate signal lines GL extending in the x direction and juxtaposed in the y direction in the drawing, and a plurality of drain signals extending in the y direction and juxtaposed in the x direction A line DL is formed.

  In the display area AR, a plurality of pixel areas are formed in a matrix. The pixel region is defined by a region surrounded by two adjacent gate signal lines GL and two drain signal lines DL. As a schematic diagram of the pixel region, a portion indicated by a symbol PIX (inside a dotted line circle frame) is shown in an enlarged view (a figure surrounded by a solid line circle frame). Each pixel region includes a thin film transistor TFT that is turned on by a scanning signal from the gate signal line GL, and a pixel electrode PX to which a video signal from the drain signal line DL is supplied via the thin film transistor TFT.

  Further, in each pixel region, a counter electrode (not shown) is formed in order to form an electric field for driving the liquid crystal with the pixel electrode PX. The counter electrode may be formed on the liquid crystal side surface of the substrate SUB2 (TN, VA method) or formed on the substrate SUB1 side (IPS method).

  The drain signal line DL extends, for example, beyond the seal material SL at one end on the upper side in the figure, and is connected to video signal drive circuits HC1, HC2,. The video signal is supplied to each drain signal line DL by driving these video signal drive circuits HC1, HC2,..., HCm. In this case, the video signal is supplied in accordance with the supply timing of the scanning signal to each gate signal line GL by the scanning signal driving circuits VC1, VC2,.

  The video signal drive circuits HC1, HC2,..., HCm are formed on the flexible substrate FB and are disposed between the printed circuit boards PCBh1 and PCBh2 disposed close to the liquid crystal display panel PNL.

  A signal Sh from a timing controller circuit (T-con) board (not shown) is supplied to the printed circuit boards PCBh1 and PCBh2, and a video signal driving circuit is connected to the printed circuit boards PCBh1 and PCBh2. HC1, HC2,..., HCm are input.

  In FIG. 2, two printed circuit boards PCBh1 and PCBh2 are provided along the parallel arrangement direction of the drain signal lines. Therefore, among the video signal drive circuits C1, HC2,..., HCm, the video signal drive circuits HC1,..., HCi are connected to the printed circuit board PCBh1, and the video signal drive circuits HCi + 1,. Has been. The printed circuit boards PCBh1 and PCBh2 may be configured as one, or may be configured with three or more.

  For example, the gate signal line GL extends beyond the seal material SL at one end on the left side in the drawing, and is connected to scanning signal drive circuits VC1, VC2,..., VCn disposed around the left side of the substrate SUB1. By driving these scanning signal drive circuits VC1, VC2,..., VCn, a scanning signal is sequentially supplied to each gate signal line GL. Control signals to the scanning signal drive circuits VC1, VC2,..., VCn are given from a timing controller circuit (T-con) board (not shown).

  In addition, the scanning signal driving circuits VC1, VC2,..., VCn do not have a wiring board corresponding to the printed circuit board PCBh1. A signal from the timing controller circuit (T-con) board is guided to the scanning signal driving circuit VC1 through a wiring LV formed so as to pass through the printed circuit board PCBh1, the video signal driving circuit HC1, and the board SUB1, for example. Further, the scanning signal drive circuits VC1, VC2,..., VCn are arranged in series by the respective flexible substrate FB and wiring LV formed on the substrate SUB1, and other scanning signal drives other than the scanning signal drive circuit VC1. The circuit also sequentially receives control signals from the timing controller circuit (T-con) board.

  The display panel PNL configured as described above is modularized by a frame member together with the backlight module. A so-called narrow frame can be achieved by bending the flexible substrate FB on which the scanning signal driving circuit and the video signal driving circuit are mounted and arranging the printed circuit boards PCBh1, PCBh2, etc. on the side surface of the liquid crystal display panel PNL. It has become.

  Next, a configuration to which the present invention characteristic portion of the display module corresponds will be described with reference to FIGS.

  FIG. 2 shows a diagram in which the display panel PNL shown in FIG. 1 is modularized as a display module. The portion shown in FIG. 2 is an enlarged cross-sectional view of the side to which the printed circuit boards PCBh1 and PCBh2 of the display panel PNL are attached. FIG. 3 is an exploded perspective view of the portion shown in FIG. FIG. 4 is a diagram corresponding to FIG. 3 and shows an exploded plan view seen from above (y direction) the display panel PNL. FIG. 5 is a perspective view showing only the middle frame 3 described later.

  The lower frame 2 is a metal frame having a rectangular recess at the center and having a frame portion around it. A backlight module BL having a light source, a reflection sheet, and an optical sheet such as a diffusion plate is disposed in a recessed portion and a part of the frame portion of the lower frame 2. The thickness of the display module is generally determined by the configuration of the lower frame 2 and the backlight module BL. However, when a thin display module is formed, it is realized by reducing the thickness of this portion.

  The frame portion of the lower frame 2 has a portion protruding from the backlight module 2 and is disposed so that the resin middle frame 3 covers the lower frame 2 and the backlight module BL. The middle frame 3 and the lower frame 2 are screwed at the frame portion of the lower frame 2, whereby the backlight module BL is fixed to the lower frame 2. The middle frame 3 has an L-shaped cross section and is formed to cover the side surface of the lower frame 2. The height (z direction) of the side surface side of the middle frame 3 is made in accordance with the position on the lower surface side of the lower frame 2 so as to align the size as the display module, and the height is made uniform. Therefore, in the case of a thin display module, the height of the middle frame 3 in the z direction is very thin.

  A display panel PNL is disposed on the middle frame 3. The upper frame 1 is assembled on the display panel PNL. The upper frame 1 has an L-shape, and is arranged so as to cover the periphery of the upper surface of the display panel PNL and the upper surface and side surfaces of the middle frame 3. Between the upper frame 1 and the middle frame 3, a space for arranging the printed circuit boards PCBh1, PCBh2, and the flexible circuit board FB is formed.

  A plurality of printed circuit board support plates 4 and a plurality of printed circuit board fixing portions 5 are formed on the side surface of the middle frame 3. The printed circuit board support plate 4 is formed by bending a part of the side wall surface of the middle frame 3 toward the opposed upper frame 1 side. The printed circuit board fixing part 5 is a protrusion formed at the bottom of the side wall surface of the middle frame 3, and has a gap thicker than the thickness of the printed circuit boards PCBh 1 and PCBh 2 between the side wall surface of the middle frame 3.

  The printed circuit boards PCBh1 and PCBh2 are arranged along the side surface of the middle frame 3, as shown in FIG. Since the flexible substrate FB is interposed between the printed circuit boards PCBh1 and PCBh2 and the display panel PNL, it can be bent easily.

  The side wall surface of the middle frame 3 is a surface on which the printed circuit boards PCBh1 and PCBh2 are installed, but the printed circuit board PCBh1 and PCBh2 are formed by forming the printed circuit board support plate 4 and the printed circuit board fixing portion 5 so that the middle frame 3 is installed in such a manner that it is pushed outward (y direction, upper frame 1 side) with the bottom of 3 as a base point. Specifically, the printed circuit boards PCBh1 and PCBh2 are disposed so as to be inclined between the middle frame 3 and the upper frame 1. For this reason, even large printed circuit boards PCBh1 and PCBh2 for full HD can be arranged without protruding from the side wall surface of the middle frame 3.

  Further, the printed circuit boards PCBh1 and PCBh2 are arranged such that the side on the display panel PNL side (the upper side in FIG. 1) is inclined toward the upper frame 1 side. Thereby, the flexible substrate FB can be bent with a margin without forcibly bending.

  As described above, the display module of the present invention is modularized with the display panel PNL, the backlight module BL, and the frame members that support them. In this display module, since a large printed circuit board for full HD can be stored without protruding, no special processing is required for the casing of the liquid crystal television.

  Therefore, it can be housed in a liquid crystal television housing having a normal thickness as well as in a thin liquid crystal television housing, and a display module with high applicability can be realized.

It is sectional drawing in the display module of this invention. It is a top view of the display panel of this invention. It is a disassembled perspective view of the display module of this invention. It is a disassembled plan view of the display module of the present invention. It is a perspective view of the middle frame 3 of this invention.

Explanation of symbols

PNL: Display panel, SUB1, SUB2 ... Substrate, AR ... Display area, GL ... Gate signal line, DL ... Drain signal line, SL ... Seal material, PCBh1, PCBh2 ... Printed circuit board, FB ... Flexible substrate, 1 ... upper frame, 2 ... lower frame, 3 ... middle frame, 4 ... printed circuit board support plate, 5 ... printed circuit board fixing part.

Claims (10)

A display panel, a flexible substrate connected to the display panel, a semiconductor chip mounted on the flexible substrate, and wiring for transmitting an external signal to the semiconductor chip are formed and connected to the flexible substrate A liquid crystal display device comprising a printed circuit board and an intermediate frame member for mounting the display panel,
The middle frame member has a printed circuit board installation surface arranged in a vertical direction with respect to the display surface of the display panel,
The printed circuit board installation surface includes a printed circuit board fixing unit that fixes one side of the printed circuit board, and a printed circuit board support unit for disposing the printed circuit board away from the printed circuit board installation surface. Liquid crystal display device. An upper frame member covering the display panel mounting surface of the middle frame member and the printed circuit board installation surface of the middle frame member;
Between the upper frame member and the display frame mounting surface of the middle frame member and between the upper frame member and the printed circuit board installation surface of the middle frame member, there is a gap,
The liquid crystal display device according to claim 1, wherein the flexible substrate and the printed circuit board are disposed in the gap.   3. The liquid crystal according to claim 2, wherein the printed circuit board fixing portion is formed along a side facing a side connected to the display panel mounting surface on a printed circuit board installation surface of the middle frame member. Display device. A backlight module arranged to overlap the display panel;
A lower frame member having a recess for accommodating the backlight module;
The liquid crystal display device according to claim 1, wherein the middle frame member is configured to cover a backlight module mounting surface and side surfaces of the lower frame member.   The liquid crystal display device according to claim 1, wherein a plurality of the printed circuit board fixing portions and the printed circuit board support portions are provided on a printed circuit board installation surface of the middle frame member. A display panel, a flexible substrate connected to the display panel, a semiconductor chip mounted on the flexible substrate, and wiring for transmitting an external signal to the semiconductor chip are formed and connected to the flexible substrate A liquid crystal display device comprising a printed circuit board and an intermediate frame member for mounting the display panel,
The middle frame member has a printed circuit board installation surface arranged in a vertical direction with respect to the display surface of the display panel,
An upper frame member covering the display panel mounting surface of the middle frame member and the printed circuit board installation surface of the middle frame member;
Between the upper frame member and the display frame mounting surface of the middle frame member and between the upper frame member and the printed circuit board installation surface of the middle frame member, there is a gap,
The liquid crystal display device, wherein the flexible substrate and the printed circuit board are disposed in the gap, and the printed circuit board is disposed obliquely with respect to the upper frame member in the gap.   The printed circuit board installation surface of the middle frame member includes a printed circuit board fixing part for fixing one side of the printed circuit board, and a printed circuit board support part for disposing the printed circuit board away from the printed circuit board installation surface. The liquid crystal display device according to claim 6.   The liquid crystal according to claim 7, wherein the printed circuit board fixing portion is formed along a side opposite to a side connected to the display panel mounting surface on a printed circuit board installation surface of the middle frame member. Display device. A backlight module arranged to overlap the display panel;
A lower frame member having a recess for accommodating the backlight module;
The liquid crystal display device according to claim 6, wherein the middle frame member is configured to cover a backlight module mounting surface and side surfaces of the lower frame member.   The liquid crystal display device according to claim 6, wherein a plurality of the printed circuit board fixing portions and the printed circuit board support portions are provided on a printed circuit board installation surface of the middle frame member.

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