JP2006030861A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which an abutting state between a printed circuit board and a resin frame is not influenced by the attachment/detachment of a front frame to/from the liquid crystal display device. <P>SOLUTION: In the liquid crystal display device, a projection for suppressing upward or downward movement of the printed circuit board is formed on the side face of the resin frame of a back light device on which a TCP (tape carrier package) on which an electrode for driving a liquid crystal display panel and an IC are packaged and the printed circuit board are abutted and a protection film consisting of a rubber piece is formed on the printed circuit board in order to protect the TCP and the printed circuit board. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid crystal display panel in a liquid crystal display device, and when a TCP (Tape Carrier Package) or a printed circuit board connected to the liquid crystal display panel attaches or removes a top chassis (front frame) to the liquid crystal display panel, The present invention relates to a liquid crystal display device that prevents a liquid crystal display panel from coming out of contact with a front frame.

  As a display device such as a television, a power-saving, thin, and lightweight liquid crystal display device has been awarded, and a highly reliable liquid crystal display device is required. This type of liquid crystal display device displays an image formed on a liquid crystal display panel by irradiating the liquid crystal display panel with light from a backlight device disposed on the back of the liquid crystal display panel. Sidelight system that changes the linear light source located on the side to a planar light source, from medium-sized notebook PCs and monitors that do not require low brightness and recently large-sized high-brightness liquid crystal televisions, etc. In many cases, the backlight device has been used.

  A sidelight type backlight device uses a light guide plate that changes a linear light source disposed on a side surface to a planar light source. A reflection plate is disposed on the back surface of the light guide plate, and an optical sheet such as a diffusion plate is disposed on the front surface. Conventionally, a linear cold cathode tube is often used as the light source, and this light source is provided at the edge of the light guide plate, so it is also called an edge light type backlight device.

  A conventional liquid crystal display device of this type is shown in the exploded perspective view of FIG. That is, the liquid crystal display device 70 includes a display unit 71 for displaying an image when an image signal is applied thereto, and a backlight device 72 for providing light to the display unit 71.

  The display unit 71 includes a liquid crystal display panel 710, a data printed circuit board 720, a gate printed circuit board 730, a data side tape carrier package (TCP) 740, and a gate side TCP 750. The liquid crystal display panel 710 includes a TFT substrate 713 in which thin film transistors (TFTs) are formed in a matrix on a glass substrate, a color filter substrate 711 in which BCG pixels are formed, and liquid crystal sealed between both substrates. A transparent common electrode made of indium tin oxide is applied to the front surface of the color filter substrate 711.

  A data line is connected to the source terminal of the TFT, and a gate line is connected to the gate terminal. A pixel electrode is connected to the drain terminal. When an electric signal is input to the data line and the gate line, an electric signal is input to the source terminal and the gate terminal of each TFT. The TFT is turned on or off by the input of the electric signal, and is necessary for driving the pixel at the drain terminal. An electrical signal is output.

  As shown in the drawing, a data side TCP 740 that determines the application timing of the data drive signal is attached to the source side of the liquid crystal display panel 710, and a gate side TCP 750 that determines the application timing of the gate drive signal is attached to the gate side. . The data printed circuit board 720 is connected to the data side TCP 740 and applies a drive signal to the data line by inputting a video signal from the outside of the liquid crystal display panel 710. The gate printed circuit board 730 is connected to the gate TCP 750 and applies a driving signal to the gate line.

  The backlight device 72 includes a light guide plate 723 which is a transparent acrylic plate, a white reflector 725 disposed on the back surface thereof, optical sheets 724 including two prism sheets and a diffuser plate disposed on the front surface, a light guide plate 723. It comprises lamp sets 721 and 722 provided on the side surface of the light plate. The lamp sets 721 and 722 are arranged so that the emission surfaces of the linear lamp light sources 7211 and 7221 are parallel along the side edge (side end surface) that is the light incident surface of the light guide plate 723, and the light guide plate of the linear lamp. A substantially U-shaped or semi-cylindrical lamp reflecting plate 7213, 7223 is provided along the entire length of the linear lamp, and the liquid crystal display panel 710 is illuminated.

  The light guide plate 723, the lamp sets 721 and 722, the optical sheets 724, and the reflection plate 725 are accommodated in the resin frame 728. The resin frame 728 is housed in a metal case 740, and the display unit 71 is fixed on the resin frame 728. The resin unit 728 is placed in the metal case 740 and fixed by a front frame 750 that opposes it.

  In such a liquid crystal display device, when the front frame 750 is fitted during assembly, the front frame is assembled while pressing the TCP or the printed circuit board against the resin frame 728, but the front frame 750 contacts the printed circuit boards 720 and 730. As a result, the printed circuit boards 720 and 730 are pulled by the force applied downward at that time, causing a positional shift, and the TCP is likely to be cut or the printed circuit boards 720 and 730 are damaged. In addition, when removing the front frame 750 for some reason such as repair, the printed circuit boards 720 and 730 are lifted upward by a reverse force, and the same cutting accident or damage occurs due to excessive force. There was a risk. Therefore, it is desired to solve the problem so that the front frame 750 can be easily attached to and detached from the liquid crystal display device without cutting the TCP or damaging the circuit board.

Therefore, as shown in FIG. 8, the inventors hooked the lower portions of the printed circuit board 730 at both end corners of the gate printed circuit board 730 by hooks 729 provided on the mounting surface of the gate printed circuit board 730 of the resin frame 728. An attempt was made to solve this problem by restricting movement, but the printed circuit board was easily detached by a slight upward movement, and the problem could not be solved.
JP 2003-346533 A

  As described above, in a liquid crystal display device having a liquid crystal display panel with a TCP and a printed circuit board mounted with a TCP mounted with a driving IC, a control IC, etc., the front frame can be mounted and removed without damaging the TCP and the printed circuit board. There is a need to provide a liquid crystal display device that can be smoothly and efficiently performed.

  As a result of various studies to solve the above problems, the inventor of the present application pays attention to the contact state between the printed circuit board and the resin frame, and moves the printed circuit board at both ends in the vertical direction of the printed circuit board. The inventors have found that the above-mentioned problems can be solved by devising the means for engaging the resin frame for regulating the resin frame with the printed circuit board, and have completed the present invention.

  That is, the present invention provides a liquid crystal display provided with means for suppressing the vertical movement of the printed circuit board on the resin frame so that the contact state with the resin frame of the printed circuit board is not affected by the insertion and removal of the front frame. The object is to provide an apparatus.

  Another object of the present invention is to provide a liquid crystal display device in which a protective film made of rubber pieces is applied to the printed circuit board for protecting the printed circuit board.

  In order to solve the above problems, the invention according to claim 1 of the present application is directed to a backlight device in which a TCP (Tape Carrier Package) attached to a liquid crystal display panel and a printed circuit board are in contact with each other in the liquid crystal display device. A protrusion for suppressing the upward or downward movement of the printed circuit board is formed on the side surface of the resin frame.

  The invention according to claim 2 of the present application is a liquid crystal display device, a liquid crystal display panel having a TCP mounted with a driving IC, a control IC, and the like and a printed circuit board, one to a plurality of optical sheets, and a light guide plate , A reflection sheet, a resin frame of the backlight device that accommodates them, a lamp reflector that houses the lamp of the backlight device in close contact with the side surface of the light guide plate, a metal case that houses them and covers the back and sides, a liquid crystal display In a liquid crystal display device having a front frame that covers the front surface and the side surface of the device, a protrusion that inhibits movement of at least one of the printed circuit boards in the vertical direction is formed on the side surface of the resin frame that contacts the printed circuit board It is characterized by that.

  The invention according to claim 3 of the present application is the liquid crystal display device according to claim 1 or 2, wherein the protrusion of the resin frame is above or below the resin frame so that the protrusion of the resin frame contacts the upper end or lower end of the printed circuit board. It is provided in the position of.

  The invention according to claim 4 of the present application is the liquid crystal display device according to any one of claims 1 to 3, wherein the protrusions of the resin frame are rib-shaped, and the upper and lower ends of the printed circuit board are disposed at least on the resin frame. It is characterized by engaging with two ribs.

  The invention according to claim 5 of the present application is the liquid crystal display device according to claim 4, wherein a plurality of protrusions of the resin frame are formed to be dispersed above and below the resin frame and engage with the printed circuit board. In at least one place, the printed circuit board is formed so as to be fitted into the concave portion.

  The invention according to claim 6 of the present application is the liquid crystal display device according to any one of claims 1 to 4, wherein the protrusion on the upper side of the resin frame is engaged with the printed circuit board at a position between the TCPs. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is provided.

  The invention according to claim 7 of the present application is the liquid crystal display device according to any one of claims 1 to 6, wherein the upper part of the rubber piece is fixed around the upper protrusion of the resin frame, and the lower part of the rubber piece is printed on the lower side. It is characterized by being fixed to a circuit board.

  According to an eighth aspect of the present invention, in the liquid crystal display device according to any one of the first to seventh aspects, the printed circuit board is a gate wiring board.

  According to the first aspect of the present invention, the protrusion for suppressing the upward or downward movement of the printed circuit board is formed on the side surface of the resin frame of the backlight device in which the TCP (Tape Carrier Package) and the printed circuit board are in contact with each other. Therefore, the front frame can be easily attached to and detached from the liquid crystal display device, and the TCP and the circuit board attached to the liquid crystal display panel can be prevented from being damaged and a highly reliable liquid crystal display device can be provided. .

  According to the invention according to claim 2 of the present application, the protrusion that inhibits at least one of the vertical movements of the printed circuit board on the side surface of the resin frame of the backlight device that contacts the printed circuit board attached to the liquid crystal display panel. Thus, the same effect as in the first aspect can be obtained.

  According to the invention of claim 3 of the present application, the protrusion of the resin frame is provided at the upper or lower position of the resin frame so as to contact the upper end or the lower end of the printed circuit board. The movement can be suppressed and the same effect as in the first aspect can be obtained.

  According to the invention of claim 4 of the present application, the protrusions of the resin frame are rib-shaped, and the same effect as in claim 1 is obtained by engaging the upper and lower ends of the printed circuit board with at least two ribs of the resin frame. Is obtained.

  According to the invention of claim 5 of the present application, a plurality of protrusions of the resin frame are formed dispersedly on the top and bottom of the resin frame to engage with the printed circuit board, and at least at one place, the protrusions are fitted with the recesses of the printed circuit board. By being formed so as to be combined, the same effect as in the first aspect can be obtained. However, since the left and right movements are also restricted, the printed circuit board can be stably held.

  According to the invention according to claim 6 of the present application, the projection on the upper side of the resin frame is provided so as to engage with the printed circuit board at the position between the TCPs. Furthermore, a highly reliable liquid crystal display device can be provided without hindering TCP.

  According to the invention of claim 7 of the present application, the upper portion of the rubber piece is fixed around the protrusion on the upper side of the resin frame, and the lower portion of the rubber piece is fixed to the wiring board, thereby protecting the circuit board. Thus, a highly reliable liquid crystal display device can be provided.

  According to the invention of claim 8 of the present application, in the liquid crystal display device, an excellent effect can be obtained by applying the present invention to the gate wiring substrate.

  As described above, the present invention can easily attach and remove the front frame while protecting the printed circuit board, and a highly reliable liquid crystal display device can be obtained. Can have an excellent effect.

  Hereinafter, embodiments of the liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings. However, the examples shown below exemplify a liquid crystal display device for embodying the technical idea of the present invention, and are not intended to specify the present invention in this example. The present invention can be equally applied to various modifications without departing from the technical idea shown in the claims.

  FIG. 1 is an exploded perspective view showing the structure of an embodiment of a liquid crystal display device according to the present invention, FIG. 2 is an assembled cross-sectional view of the liquid crystal display device taken along line II in FIG. 1, and FIG. FIG. 4 is a view showing a resin frame according to the present invention, FIG. 4 (a) is a perspective view, and FIG. 4 (b) is an enlarged view of a portion A in FIG. 4 (a). 4 (c) is an enlarged view of part B in FIG. 4 (a), FIG. 4 (d) is an enlarged view of part C in FIG. 4 (a), and FIG. 5 is a rubber piece on the circuit board of the liquid crystal display device of the present invention. 5 (a) is a perspective view, FIG. 5 (b) is an enlarged view of portion D of FIG. 5 (a), FIG. 5 (c) is an enlarged view of portion E of FIG. 5 (a), and FIG. 6 is a cross-sectional view of the main part of the liquid crystal display device. FIG. 6A is a cross-sectional view taken along the line HH in FIG. 5C, and FIG. 6B is a cross-sectional view taken along the line JJ in FIG. is there.

  As shown in FIG. 1, the liquid crystal display device 1 of the present invention includes a liquid crystal display panel 10, first and second prism sheets 14 and 15 disposed on the back surface of the liquid crystal display panel 10, and diffusion disposed on the front surface of the light guide plate. The sheet 16, the rectangular flat plate-shaped acrylic light guide plate 17, and the reflection sheet 18 disposed on the back of the light guide plate 17 are combined, and these constituent members support the liquid crystal display panel 10 on the upper side by the resin frame 20 and on the lower side. The other components are fitted and housed, and this is housed in the bottom plate 21 and is assembled by fitting the front frame 22 on the front surface. The light guide plate 17 and the resin are arranged so that the first and second lamp sets 19 a and 19 b in which linear lamps are attached to the lamp reflecting plate are parallel to the light guide plate 17 on the two opposite side end surfaces of the light guide plate 17. It is attached to the gap between the frame 20 and the bottom plate 21. Reference numeral 23 denotes a lower cover attached to the bottom plate. The lower cover 23 covers and stores the TCP 101 and the source printed circuit board 103 which are bent from the side surface of the resin frame and are in contact with the back surface of the bottom plate. The liquid crystal display panel 10 is mounted with TCP (Tape Carrier Package) 101, 102 to which a driving IC such as a source driver or gate driver for driving a pixel is attached and a controller IC of a driving circuit connected to the TCP. The circuit boards 103 and 104 are connected to the panel board.

  2 is an assembled cross-sectional view of the liquid crystal display device 1 of FIG. 1, and FIG. 3 is an assembled perspective view of the liquid crystal display device 1 of FIG. 1, with the front frame 22 removed. As can be seen from FIG. 2, the gate printed circuit board 104 abuts the side surface of the resin frame 20 and is wrapped in the front frame 22, and the source printed circuit board 103 is not shown, but a part of the TCP 101 contacts the side surface of the resin frame. The source printed circuit board 103 is in close contact with the back surface of the bottom plate 21 and is accommodated in the lower cover 23. FIG. 3 shows the liquid crystal display device 1 in which the liquid crystal display panel 10 is disposed on the front surface and the frame body 22 is fitted. The first lamp set 19 a and the second lamp set 19 b are incorporated on both sides of the light guide plate 17. Yes.

  FIG. 4 is an enlarged view of portions A to C on the side surface where the resin frame 20 of the liquid crystal display device 1 and the gate printed circuit board 104 are in contact with each other. Three ribs 201, 202, and 203 are provided on the side surface 20 a of the resin frame 20. As shown in FIG. 4C, one central portion 201 is formed at the lower portion of the resin frame 20 by connecting to the vertical ribs 204 hanging from the girders 20b of the resin frame 20, and is provided at the center of the lower side of the gate printed circuit board 104. It fits into the notch and suppresses downward movement of the printed circuit board. As shown in FIGS. 4A and 4B, the two ribs 202 and 203 on both sides are formed on the spar 20b above the resin frame 20, and contact the upper side of the gate printed circuit board 104. The upward movement of the gate printed circuit board 104 is suppressed. Since these three ribs suppress vertical movement, the printed circuit board is not detached from the hooks 729 at both ends, and the front frame 22 can be mounted smoothly.

  Although the illustration of the gate printed circuit board is omitted in FIG. 4, the protrusion of the resin frame 20 is provided at the upper or lower position of the resin frame so as to contact the upper end or the lower end of the gate printed circuit board 104. The protrusions of the resin frame 20 are rib-shaped, and the upper and lower ends of the gate printed circuit board 104 are engaged with at least two rib-shaped protrusions formed on the resin frame 20. It is preferable to form the protrusions so as to be fitted with a plurality of concave portions 104a formed on the upper and lower sides of the gate printed circuit board 104, since not only the vertical movement of the printed circuit board but also the left and right movements can be suppressed. The protrusions 202 and 203 on the upper side of the resin frame 20 are provided so as to contact the printed circuit board at a position between the TCPs 102 connecting the liquid crystal display panel 10 and the gate printed circuit board 104. The reason why the ribs 202 and 203 are provided at a position where the TCP 102 does not exist is that when the rib and the TCP overlap, the TCP floats and the holding of the printed circuit board is unstable.

  FIG. 5A is a perspective view in the case where a small rubber piece 30 is further applied to the gate printed circuit board 104 attached to the side surface of the resin frame 20 for protection. In the case of FIG. 5 (b), the upper portion of the rubber piece 30 is fixed at a position adjacent to the upper projection 202 provided on the beam 20b of the resin frame 20 and without TCP and avoiding the projection 202, The lower end of the rubber piece 30 is fixedly provided around the printed wiring of the gate printed circuit board 104. In the case of FIG. 5C, the rubber piece 30 is provided at the center of the resin frame 20. Here, the upper part of the rubber piece 30 is fixed at a position where the TCP of the resin frame 20 does not exist, and the lower part of the rubber piece is extended to the lower protrusion 201 that supports the lower side of the gate printed circuit board 104. In this way, when the front frame 22 is fitted to the liquid crystal display panel 10 and pushed down, the rubber piece 30 is supported by the lower protrusion 201 and does not move downward, so the printed circuit board 104 does not move downward. By applying such a small rubber piece 30, an elastic rubber body is interposed between the gate printed circuit board 104 and the front frame 22, and the front frame 22 is in direct contact with the TCP or the printed circuit board surface. Therefore, a highly reliable liquid crystal display device with enhanced protection of the printed circuit board can be provided.

  FIG. 6 is a cross-sectional view of a portion provided with the rubber piece shown in FIG. 6A is a cross-sectional view taken along the line H-H in FIG. 5C, and FIG. 6B is a cross-sectional view taken along the line JJ in FIG. The gate printed circuit board 104 abuts on the side surface of the resin frame 20, and the front frame 22 covers the outer side with a small rubber piece 30 interposed therebetween. The protrusion 201 of the resin frame 20 is fitted in the cut portion 104 a on the lower side of the gate printed circuit board 104. In this way, the printed circuit board can be brought into close contact with the side surface of the resin frame, and the support state of the printed circuit board is fixed, so that the printed circuit board is not tilted.

  In such a printed circuit board holding structure, as described above, the front frame does not face the direct contact with the printed circuit board via the rubber piece, and the printed circuit board is stably supported by the protrusion of the resin frame. Because it does not move, the resin frame will not come off the specified position, it will not be caught, pushed or pulled by the front frame, and the connection between the liquid crystal display panel and TCP or printed circuit board will be damaged Disappears. Therefore, a highly reliable liquid crystal display device can be obtained. In addition, it is possible to efficiently and easily perform the removal work for attaching the front frame to the liquid crystal display device, exchanging and repairing the front frame.

  In addition to the above embodiments, the number and shape of the protrusions on the resin frame can be variously modified. For example, the numbers of the first protrusions and the second protrusions are arbitrary. Further, if a hole for fitting a rib is provided in the middle of the width direction of the printed circuit board and fitted into the rib of the resin frame, the vertical movement of the printed circuit board can be suppressed by one protrusion. The printed circuit board whose movement is suppressed has been described above by taking the gate wiring board as an example. However, the printed circuit board is not limited to the gate wiring board, and other circuit boards may be used. For example, it may be a source printed circuit board or an integrated printed circuit board (not shown) in which the source printed circuit board and the gate printed circuit board are integrated. The size, shape, and the like of the rubber piece as the protective film may be selected in accordance with the place of attachment. The material can also be selected freely.

FIG. 1 is an exploded perspective view showing the structure of an embodiment of a liquid crystal display device according to the present invention. FIG. 2 is an assembled cross-sectional view of the liquid crystal display device taken along line II in FIG. FIG. 3 is an assembled perspective view of the liquid crystal display device of FIG. FIG. 4 is a view showing a resin frame according to the present invention, FIG. 4 (a) is a perspective view, FIG. 4 (b) is an enlarged view of portion A of FIG. 4 (a), and FIG. 4 (c) is FIG. FIG. 4D is an enlarged view of part B in FIG. 4A, and FIG. 4D is an enlarged view of part C in FIG. 5A and 5B are diagrams in which a rubber piece is provided on the circuit board of the liquid crystal display device of the present invention, FIG. 5A is a perspective view, FIG. 5B is an enlarged view of a portion D in FIG. FIG. 5C is an enlarged view of a portion E in FIG. 6A and 6B are cross-sectional views of the main part of the liquid crystal display device. FIG. 6A is a cross-sectional view taken along the line H-H in FIG. 5C, and FIG. 6B is a cross-sectional view taken along the line JJ in FIG. It is. FIG. 7 is an exploded perspective view showing the structure of a conventional liquid crystal display device. 8A and 8B are views showing a conventional circuit board locked state, in which FIG. 8A is a perspective view, FIG. 8B is an enlarged view of a portion F in FIG. 8A, and FIG. It is the G section enlarged view of Fig.8 (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 10 Liquid crystal display panel 14 1st prism sheet 15 2nd prism sheet 16 Diffusion sheet 17 Light guide plate 18 Reflective sheet 19a, 19b Lamp set 20 Resin frame 21 Bottom plate 22 Front frame 30 Rubber piece 101, 102 TCP
103 Source Printed Circuit Board 104 Gate Printed Circuit Board 201, 202, 203 Projection

Claims (8)

In the liquid crystal display device, a protrusion for suppressing the upward or downward movement of the printed circuit board is formed on the side surface of the resin frame of the backlight device where the TCP attached to the liquid crystal display panel and the printed circuit board are in contact with each other. A characteristic liquid crystal display device. Liquid crystal display panel with a TCP mounted with a driving IC, a control IC, etc. and a printed circuit board, one or more optical sheets, a light guide plate, a reflective sheet, a resin frame of a backlight device that accommodates these, A liquid crystal display having a lamp reflector in close contact with the side end face of the light guide plate and storing a lamp of the backlight device, a metal case for storing them and covering the back and sides, and a front frame covering the front and sides of the liquid crystal display device 2. A liquid crystal display device according to claim 1, wherein a protrusion for preventing movement of at least one of the printed circuit boards in the vertical direction is formed on a side surface of the resin frame that contacts the printed circuit board. 3. The liquid crystal display device according to claim 1, wherein the protrusion of the resin frame is provided at an upper or lower position of the resin frame so as to contact an upper end or a lower end of the printed circuit board. 4. The liquid crystal display according to claim 1, wherein the protrusion of the resin frame has a rib shape, and upper and lower ends of the printed circuit board are engaged with at least two ribs of the resin frame. 5. apparatus. A plurality of protrusions on the resin frame are formed in a distributed manner on the upper and lower sides of the resin frame so as to engage with the printed circuit board, and are formed so as to be fitted to the recesses of the printed circuit board at least at one place. The liquid crystal display device according to claim 4. 5. The liquid crystal display device according to claim 1, wherein the protrusion on the upper side of the resin frame is provided to engage with the printed circuit board at a position between the TCPs. The liquid crystal display according to claim 1, wherein an upper portion of a rubber piece is fixed around a protrusion on an upper side of the resin frame, and a lower portion of the rubber piece is fixed to the printed circuit board. apparatus. The liquid crystal display device according to claim 1, wherein the printed circuit board is a gate wiring board.

Images