JP2012013723A - Liquid crystal module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal module which is improved so that flexibility is given to a connector attachment position in an LED bar to be able to shorten a flat cable connecting the LED bar and a main substrate to each other, without bringing about uneven brightness on a display surface of a liquid crystal panel.SOLUTION: In the liquid crystal module where an LED bar 2 having LED light sources 2a mounted on a wiring board 2c in one array at fixed intervals is disposed along an end surface of a light guide plate 1 and is housed in a rear frame 6, a connector 3 is attached to a position not interfering with the LED light sources 2a, except both end parts in a lengthwise direction of the wiring board 2c of the LED bar 2, and both ends of a flat cable 4 are connected to the connector 3 and a connector 30 on a main substrate 5 on the backside of the rear frame 6. Since the connector 3 does not interfere with the LED light sources 2a and it is unnecessary to extend a pitch of the LED light sources, uneven brightness is not brought about. Since a distance between the connectors 3 and 30 is made shorter than that in the case of attaching the connector 3 to an end part of the LED bar, the cable 4 can be shortened.

Description

  The present invention relates to an edge-light type liquid crystal module incorporated in a television, a car navigation system, a personal computer or other electronic devices, and more specifically, without causing uneven brightness on the display surface of the liquid crystal panel. The present invention relates to an improved liquid crystal module so that the length of a flat cable connecting a main board can be shortened.

  In the conventional edge light type liquid crystal module, as shown in FIG. 10, LED bars 200 are arranged along the end surface of the light guide plate 1 accommodated in the rear frame 6. As shown in FIG. 11, the LED bar 200 has a plurality of LED light sources 2a mounted on the surface of the wiring board 2c in a line at regular intervals. The power supply wiring 2b is connected to the length of the wiring board 2c. The connector 3 for connection with the main board 5 is attached to the terminal portion of the wiring 2b. Then, one end of the flat cable 4 is connected to the connector 3, and the cable 4 is pulled out from the corner opening 6a of the rear frame 6 to the rear surface of the rear frame 6 as shown in FIG. It is connected to the connector 30 of the main board 5 (power supply / driver board) attached to the rear surface of the rear frame 6.

  On the other hand, a flat display element, a light guide disposed on the back side of the flat display element, a flexible substrate mounted with an LED light source and folded back to the back side of the flat display element, and display of the flat display element 2. Description of the Related Art A flat display device is known that includes an external input board connected to a side, and a wiring section that connects the output side of the external input board and the output side of the flexible board (Patent Document 1).

  A display panel; illumination means for illuminating the display panel; a circuit board in which an opening is formed in an inner region of an annular component mounting area; and the illumination means and the back surface of the circuit board (display panel) There is also known a display device including a connection body that connects a connector on the opposite surface) via the opening (Patent Document 2).

  Furthermore, a wiring connector is provided at both ends of the LED lighting printed circuit board so that the LED lighting printed circuit board can be connected, and when connected, the circuit pattern is formed so that the distance between the LED elements is equal. A printed circuit board is also known (Patent Document 3).

JP 2009-128594 A JP 2009-276603 A JP 2007-103886 A

  However, as in the conventional edge light type liquid crystal module, the LED bar 200 arranged along the end face of the light guide plate 1 has the connector 3 for connection with the main board 5 at one end in the length direction of the wiring board 2c. If it is attached, the distance from the connector 3 to the connector 30 of the main board 5 on the back of the rear frame 6 becomes long, and it is necessary to use a long flat cable 4 corresponding to the distance. There was a problem. However, when the connector 3 is attached to the intermediate part of the wiring board 2c to reduce the distance to the connector 30 of the main board 5, the LED light source 2a mounted on the intermediate part and the connector 3 do not interfere with each other. In addition, since the connector 3 must be attached by expanding the pitch of the LED light sources 2a, 2a adjacent to each other in the middle portion, the luminance of the corresponding portion of the liquid crystal panel display surface corresponding to the pitch expanded portion of the LED light source is lowered when the LED is turned on. As a result, the problem of becoming darker than other parts (hot spot problem) occurs.

  In addition, the flat display device of Patent Document 1 is provided with a flexible substrate on which an LED light source is mounted instead of the LED bar, and is folded back to the back side of the flat display element to be provided along the light guide plate. However, since the wiring part connects the input side end of the flexible board and the output side of the external input board, a long wiring part is required, and no means for shortening the wiring part is taken. .

  On the other hand, the display device of Patent Document 2 does not incorporate an LED bar, and Patent Document 3 is an LED bar (LED illumination printed circuit board). However, it is not intended to shorten the flat cable connecting the LED bar and the main board.

  The present invention has been made under the circumstances described above, and the problem to be solved is to provide a degree of freedom in the mounting position of the connector in the LED bar, and without causing uneven brightness on the display surface of the liquid crystal panel. An object of the present invention is to provide an improved liquid crystal module so that the length of the flat cable connecting the wiring board of the bar and the main board on the back of the liquid crystal module can be shortened.

  In order to solve the above-described problems, the liquid crystal module according to the present invention includes an LED bar in which a plurality of LED light sources are mounted in a line at regular intervals on the surface of an elongated wiring board and arranged along the end surface of the light guide plate. A liquid crystal module that is housed inside and that has a liquid crystal panel disposed on the front side of the light guide plate, except for both ends in the length direction of the wiring board of the LED bar, at locations that do not interfere with the LED light source, A connector for connection with the main board is attached.

  In the liquid crystal module of the present invention, it is preferable to attach connectors for connection with the main board on the back surface except for both ends in the length direction of the wiring board of the LED bar, and both ends in the length direction of the wiring board of the LED bar. It is also preferable to form a projecting portion in the width direction at a portion excluding, and attach a connector for connection to the main board to the projecting portion.

  Like the conventional liquid crystal module, when the connector for connecting to the main board is attached to a place where it does not interfere with the LED light source except for both ends in the length direction of the wiring board of the LED bar as in the liquid crystal module of the present invention. The distance from the LED bar connector to the main board connector on the back of the rear frame is shorter than that with a connector attached to one end in the length direction of the wiring board of the LED bar, so the flat cable is shortened accordingly. Cost reduction. Also, if the connector mounting location does not interfere with the LED light source, it is not necessary to partially expand the pitch of the LED light source to avoid interference between the connector and the LED light source. The brightness unevenness of the surface does not occur, and the hot spot problem can be avoided.

  In the liquid crystal module of the present invention, the connector for connecting to the main board is attached to the back surface of the LED bar except for both ends in the length direction of the wiring board. Even if a connector is attached to the location, it does not interfere with the LED light source mounted on the surface of the wiring board, so the degree of freedom of the connector attachment location is large and the installation location that minimizes the distance from the connector on the main board is selected By doing so, the length of the flat cable connecting the LED bar and the main board can be greatly shortened to reduce the cost.

  In addition, in the liquid crystal module of the present invention, a protrusion in the width direction is formed in a portion excluding both ends in the length direction of the wiring board of the LED bar, and a connector for connecting to the main board is attached to the protrusion. The connector attached to the protrusion does not interfere with the LED light source regardless of where the protrusion is formed except for both ends in the length direction of the wiring board. By selecting the part with the greatest degree of freedom and the shortest distance from the connector on the main board to form the protrusion and attaching the connector, the length of the flat cable can be greatly reduced and the cost can be reduced. it can.

It is a front view of the liquid crystal module concerning one embodiment of the present invention. It is a rear view of the liquid crystal module. It is sectional drawing of the liquid crystal module. It is a front view of the LED bar integrated in the liquid crystal module. It is a rear view of the LED bar. It is a right view of the LED bar. It is a front view of another LED bar. It is a right view of another LED bar. It is a perspective view of the connector attachment part of the other LED bar protruded from the rear frame. It is a rear view of the conventional liquid crystal module. It is a front view of the LED bar integrated in the conventional liquid crystal module.

  The edge light type liquid crystal module shown in FIGS. 1 to 3 includes a light guide plate 1 made of a transparent synthetic resin accommodated inside a shallow box-shaped rear frame 6 formed by bending a sheet metal. The LED bar 2 is disposed along the lower end surface of the LED. A light reflection sheet 7 is disposed on the back side of the light guide plate 1, and an optical sheet 8 such as a light diffusion sheet and a liquid crystal panel 9 are disposed on the front side of the light guide plate 1. A main board 5 (power supply / driver board) is attached to the rear surface of the rear frame 6.

  As shown in FIG. 3, the liquid crystal panel 8 is supported by a synthetic resin cell guide 10 attached to the end of the side wall of the rear frame 6, and is positioned vertically and horizontally by positioning protrusions 10 a of the cell guide 10. The four peripheral edges of the liquid crystal panel 8 are covered and fixed by a rectangular frame-shaped bezel 11. Further, the optical sheet 8 is fixed by sandwiching the four peripheral edges of the sheet in a recess between the front end of the side wall of the rear frame 6 and the cell guide 10.

  As shown in FIG. 3, a terminal portion on one end side of the chip-on film 12 is crimped to the upper end edge of the liquid crystal panel 8, and the terminal portion on the other end side of the film 12 is on the back surface of the rear frame 6. It is crimped to the attached X-substrate 13. Note that the chip-on film 12 and the X-substrate 13 are not shown in FIG.

  As shown in FIGS. 4 to 6, the LED bar 2 has a plurality of LED (light emitting diode) light sources 2a mounted on the surface of an elongated strip-like wiring board 2c in a line at regular intervals. Wirings 2b for supplying power to these LED light sources 2a are formed on the back surface of the substrate 2c, and the wiring light sources 2b and respective terminal portions 2d for mounting LED light sources on the surface of the wiring substrate 2c are connected through through holes 2e. The wiring 2b on the back surface is routed to the central portion in the length direction of the wiring board 2c, and the connector 3 for connection with the main board 5 is attached to the terminal part. Thus, the connector 3 attached to the center of the back surface of the wiring board 2c does not interfere with the LED light source 2a mounted on the surface of the wiring board 2c.

  One end of a flexible flat cable 4 is connected to the connector 3, and the flat cable 4 is connected to an opening 6 a formed at the center of the lower end edge of the rear frame 6 as shown in FIGS. 2 and 3. The other end of the cable 4 is connected to the connector 30 of the main board 5 by being pulled out to the rear surface of the rear frame 6.

  In the liquid crystal module of this embodiment, the connector 3 for connection to the main board 5 is attached to the back surface of the wiring board 2c of the LED bar 2 so as not to interfere with the LED light source 2a, thereby partially adjusting the pitch of the LED light sources 2a. Therefore, the problem of hot spots can be avoided. Moreover, since the distance from the connector 3 to the connector 30 of the main board 5 is minimized by attaching the connector 3 to the back surface of the central portion in the length direction of the wiring board 2c, the length of the flat cable 4 is reduced. A significant reduction in cost can be achieved. Further, when the connector 3 is attached to the back surface of the wiring board 2c of the LED bar 2 and disposed outside like the liquid crystal module, there is an advantage that light leakage from the opening 6a of the rear frame 6 can be reduced.

  In the liquid crystal module of the above embodiment, the connector 3 is attached to the back surface of the central portion in the length direction of the wiring board 2c of the LED bar 2, but the attachment location of the connector 3 is except for both ends in the length direction of the wiring board 2c. In addition, the back surface of the intermediate portion may be anywhere, and the connector 3 may be attached by selecting the attachment location where the distance to the connector 30 is the shortest according to the position of the connector 30 on the main board 5.

  7 and 8 show other examples of LED bars incorporated in the liquid crystal module of the present invention. This LED bar 20 is configured as a horizontally long T-shaped LED bar by projecting a protruding portion 2f in the width direction at the center in the length direction of the elongated wiring substrate 2c. The LDE light sources 2a are mounted in a row at regular intervals, and wirings 2b for supplying power to these LED light sources 2a are formed. The power supply wiring 2b is routed to the protruding portion 2f at the center in the length direction of the wiring board 2c, and the connector 3 for connection with the main board 5 is attached to the surface of the protruding portion 2f. 2b is connected to the terminal portion.

  Similar to the LED bar 2, the LED bar 20 is disposed along the lower end surface of the light guide plate 1 with the LED light source 2a facing the light guide plate 1, and as shown in FIG. The protruding portion 2f and the connector 3 are attached so as to protrude from the opening 6a formed at the center of the lower end edge of the rear frame 1 to the back side. One end of the flat cable 4 is connected to the connector 3, and the other end is connected to the connector 30 of the main board 5. In order to prevent light leakage from the gap between the protrusion 2f and the connector 3 and the opening 6a, it is preferable to cover the gap by attaching a light leakage countermeasure sheet 14 as shown in the figure.

  The liquid crystal module in which the LED bar 20 as described above is arranged along the lower end surface of the light guide plate 1 and accommodated inside the rear frame 6 also prevents the connector 3 for connection with the main board 5 from interfering with the LED light source 2a. Further, by attaching the LED bar 2 to the protruding portion 2f of the wiring board 2c, it is not necessary to partially expand the pitch of the LED light sources 2a, so that the problem of hot spots can be avoided. In addition, since the protrusion 2f for attaching the connector 3 is formed at the center in the length direction of the wiring board 2c, the distance from the connector 3 to the connector 30 of the main board 5 is minimized, so that the flat cable 4 It is possible to achieve a cost reduction by greatly reducing the length of the. Further, if the protruding portion 2f of the LED bar 20 and the connector 3 protrude from the opening 6a of the rear frame 6, it becomes easy to stick the light leakage countermeasure sheet 14, and the gap of the opening 6a is reliably covered. Therefore, there is an advantage that light leakage from the opening 6a can be surely prevented.

  The projecting portion 2f for attaching the connector 3 may be formed at any location as long as it is an intermediate portion excluding both end portions in the length direction of the wiring board 2c. The location where the distance is shortest is selected to form the protruding portion 2f, and the connector 3 may be attached.

  In the liquid crystal module of the above embodiment, the LED bar 2 or 20 is disposed along the lower end surface of the light guide plate 1, but the LED bar 2 or 20 may be disposed along the upper and lower end surfaces of the light guide plate 1, Needless to say, the LED bar 2 or 20 may be disposed along the left or right end face of the light guide plate 1.

DESCRIPTION OF SYMBOLS 1 Light guide plate 2,20 LED bar 2a LED light source 2b Wiring 2c Wiring board 2f Protrusion part 3 Connector for connection with main board 4 Flat cable 5 Main board 6 Rear frame 9 Liquid crystal panel

To solve the above problems, a liquid crystal module according to the present invention, an elongated place the LED bar having a plurality of LED light sources in a row at regular intervals along the end face of the light guide plate in the surface of the wiring board to Rutotomoni, on the front side of the light guide plate to a liquid crystal module of arranging the liquid crystal panel, except for the both longitudinal ends of the wiring substrate of the LED bar, at a location that does not interfere with the LED light source, attach the connector to the main board It is characterized by that.

Claims (3)

An LED bar in which a plurality of LED light sources are mounted in a line at regular intervals on the surface of an elongated wiring board is disposed along the end surface of the light guide plate and accommodated inside the rear frame, and a liquid crystal panel is disposed on the front side of the light guide plate. An arranged liquid crystal module,
A liquid crystal module, wherein a connector for connection with a main substrate on the rear surface of a rear frame is attached to a portion not interfering with an LED light source except for both ends in the length direction of a wiring substrate of an LED bar.   2. The liquid crystal module according to claim 1, wherein a connector for connection with the main board is attached to the back surface of the LED bar except for both ends in the length direction of the wiring board.   The width direction protrusion part is formed in the site | part except the length direction both ends of the wiring board of LED bar, The connector for a connection with a main board | substrate was attached to this protrusion part. LCD module.

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