KR19980060784A - Backlight device for liquid crystal display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device for a liquid crystal display device, comprising: a support plate supporting a lamp by a reflecting plate for reflecting light emitted from the rear of a straight tube lamp to the front of the lamp; and a high reflecting material on an inner wall of the support plate opposite to the lamp. The coated reflective layer is provided, and the support plate is made of a conductive metal material, and a connection portion for connecting the first electrode terminal is provided at a position corresponding to the first electrode terminal provided on one side of the lamp, and provided on the other side of the lamp. A first through hole is provided to protrude outward while the second electrode terminal is electrically separated at a position corresponding to the second electrode terminal. An external driving power source is provided at one side of the support plate near the second electrode terminal and the second electrode terminal. By facilitating the electrical connection with the device, the structure is simplified and the occupied space becomes small, which contributes to slimming of the LCD. The lamp can be easily attached or detached, thereby simplifying the lamp replacement work.

Description

Backlight device for liquid crystal display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device for a liquid crystal display device, and more particularly, to a backlight device for a liquid crystal display device having a simple structure and easy separation.

Liquid crystal display devices (LCDs) have been widely used as OA devices, TV screen displays, etc. in electronic display desks and watches, as well as measurement displays. Since the LCD itself is a non-light-emitting, light-receiving display element that receives light from the outside to form an image, a backlight device for uniformly irradiating the display surface is introduced for the purpose of enabling use in a dark place.

In the reflective liquid crystal, the sharpness of the LCD screen is largely dependent on the ambient light. However, in the transmissive liquid crystal display device with a backlight, visibility is not deteriorated even when the ambient light is low level due to back irradiation. In particular, in the automotive liquid crystal display device in which the ambient light changes from the brightness of the day to the night, the addition of a backlight device is essential in order to keep the image easy to see.

1 is a cross-sectional view schematically illustrating a conventional backlight device of a liquid crystal display device, and FIG. 2 is a perspective view illustrating a lamp of the backlight device of FIG. 1.

First, referring to FIG. 1, a backlight device includes a lamp 1 for irradiating light, a reflector 2 reflecting light emitted from the lamp 1 toward the front of the lamp 1, and a reflector 2. A light guide plate 3 for converting light paths provided in front of the light entering the inner wall while converting light paths therein; and a diffuser plate provided on the reflection plate 2 to diffuse light incident through the light guide plate 3 ( 4) is provided. The liquid crystal panel 5 is provided on the diffuser plate 4 to receive light irradiated over a large area from the diffuser plate 4.

The backlight device configured as described above is incorporated in the case 6 together with the liquid crystal panel.

However, in the related art, a connection between a straight lamp 1 used as a light source and an external driving power source (not shown) is shown in FIG. 2, so that both electrode terminals 1a and 1b of the lamp 1 are connected to a wire cable ( 7) is connected to an external driving power source. Therefore, in order to connect the electrode terminal 1a of the lamp 1 which is inconvenient to mount the lamp 1 in the case 6 and is immersed inside the case 6, the case 6 is connected to the driving power provided outside the case 6. The space occupied by the case 6 becomes large because the cable 7 connected to the electrode terminal 1a entering the inside has to be drawn out to the part where the opposite electrode terminal 1b exists through the inner space of the case 6. There is a problem that inhibits the thinning, which is an advantage of the LCD.

In addition, since the cable 7 drawn out from the inside of the case 6 is drawn out behind the reflector 2, there is a problem in that the backlight device must be separated as a whole to replace the lamp 1 when the lamp 1 reaches its end of life.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a backlight device for a liquid crystal display device that is simple in connection with a lamp and an external driving power source and has a small occupied space, which is advantageous for thinning an LCD and is easily removable. The purpose is.

1 is a cross-sectional view schematically showing a conventional backlight device of a liquid crystal display device;

FIG. 2 is a perspective view of a lamp applied to the backlight device of FIG. 1;

3 is a cross-sectional view of a backlight device for a liquid crystal display device according to an embodiment of the present invention;

4 is an enlarged exploded perspective view of portion A of the backlight device of FIG. 3.

Explanation of symbols for main parts of the drawings

1, 11: Lamp 2, 12: Reflector

3, 13: light guide plate 4, 14: diffuser plate

5, 15: liquid crystal panel 6, 16: case

11a: first electrode terminal 11b: second electrode terminal

12a: support plate 17: connection contactor

In order to achieve the above object, a backlight device for a liquid crystal display device according to the present invention includes a reflector for reflecting light emitted from the rear of a straight lamp toward the front of the lamp, and the light reflected from the reflector and directly from the lamp. 10. A backlight device for a liquid crystal display device having a light guide plate for guiding emitted light and a diffuser plate provided on an upper surface of the light guide plate to diffuse incident light onto the upper surface, wherein the reflecting plate is opposed to a support plate for supporting the lamp and the lamp. A reflective layer coated with a highly reflective material on an inner wall of the supporting plate, wherein the supporting plate is made of a conductive metal material and connected to the first electrode terminal at a position corresponding to the first electrode terminal provided on one side of the lamp. A connecting portion is provided, and the image is disposed at a position corresponding to the second electrode terminal provided on the other side of the lamp. A first through hole is provided to protrude outward while the second electrode terminal is electrically separated from the second electrode terminal, thereby enabling electrical connection with the outside at one side of the support plate near the second electrode terminal and the second electrode terminal. It is done.

Hereinafter, a backlight device for a liquid crystal display device according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view of a backlight device for a liquid crystal display device according to an exemplary embodiment of the present invention, and FIG. 4 is an enlarged separated perspective view of part A of the backlight device of FIG. 3.

Referring to FIG. 3, the backlight device is provided in front of the reflector 12 and guides light entering the light guide plate 13 to convert an optical path from the light hitting the inner wall to the upper part and a light guide plate disposed above the reflector 12. The diffusion plate 14 for diffusing the light incident through the 13 is provided as in the prior art, and reflects the light emitted from the rear of the light emitted from the straight lamp 11 for irradiating the light toward the front of the lamp 11. The reflective plate 12 is structured so as to relay the connection between the lamp 11 and the external driving power source, thereby simplifying the structure. The liquid crystal panel 15 is provided on the diffuser plate 14 to receive light irradiated over a large area from the diffuser plate 14.

The backlight device structured as described above is mounted to the case 16 together with the liquid crystal panel 15.

As shown in FIG. 4, the reflecting plate 12 is provided with a support plate 12a having an open opening in front of the straight lamp 11 and a reflecting layer 12b coated with a high reflecting material on the inner wall facing the lamp 11. do. Therefore, the light emitted backward from the light emitted from the lamp 11 is reflected by this reflective layer 12b and focused in front of the lamp 11.

The support plate 12a is shaped in relation to the shape of the lamp 11 so that the straight lamp 11 having the first and second electrode terminals 11a and 11b respectively provided thereon can be seated and supported at right sides thereof. In the case of the illustrated lamp 11, it is preferable to form the groove 12c so that the lamp 11 is fitted at a position corresponding to both edges of the lamp 11.

In addition, the support plate 12a is formed of a conductive metal such as aluminum, and a connection part for connecting the first electrode terminal 11a is provided at a position corresponding to the first electrode terminal 11a. The structure of the connecting portion is possible by various methods, and in this embodiment, the first electrode protruding outside the support plate 12a by forming a second through hole 12e through which the first electrode terminal 11a can pass. The terminal 11a is joined to the portion around the second through hole 12e by soldering. In order to facilitate soldering, the diameter of the second through hole 12e may be slightly larger than the diameter of the first electrode terminal 11a.

As a structure of another connecting portion, when the first electrode terminal 11a enters, two metal pieces and a spring member are connected between the metal pieces so as to be bitten by elastic force, and the two metal pieces are electrically connected to the support plate 12a. It is also possible to combine.

A first through hole 12d is formed at a position corresponding to the second electrode terminal 11b of the lamp 11 in the support plate 12a so that the second electrode terminal 11b protrudes out of the support plate 12a. . As described above, when the edge of the lamp 11 adjacent to the second electrode terminal 11b is fitted into the groove 12c and seated, the second electrode terminal having a diameter smaller than the diameter of the first through hole 12d ( 11b) is electrically separated from the support plate 12a. In order to strongly maintain the insulation between the second electrode terminal 11b and the support plate 12a, it is preferable to insert a ring member (not shown) made of an insulating material such as rubber around the first through hole 12d.

Therefore, since the first electrode terminal 11a and the support plate 12a of the lamp 11 are electrically connected to each other, the support plate 12a around the second electrode terminal 11b and the second electrode terminal 11b of the lamp 11 is connected. When a predetermined portion of the () is connected to the external driving circuit, the driving connection of the lamp 11 is made.

As the connecting connector 17 is shown, the supporting plate around the second electrode terminal 11b and the second electrode terminal 11b so that the reflector plate 12 into which the lamp 11 is fitted can be easily detached into and out of the case 16. A predetermined portion of 12a is connected by a cable 18. Accordingly, when the lamp 11 is replaced, the lamp 11 may be easily replaced since the lamp 11 may be replaced after the connector 17 or the reflecting plate 12 is pulled out of the case 16. .

Compared with the conventional backlight device, the cable drawn out from the inside of the case 16 is omitted, thereby reducing the occupied space, thereby contributing to slimming of the LCD, and easily attaching and detaching the lamp 11. Replacement is simplified.

As described above, by providing the backlight device for the liquid crystal display device according to the present invention, the structure is simplified, the occupied space becomes small, contributing to the slim thinning of the LCD, and the lamp is easily removed and replaced. Simplify

Claims (4)

A reflecting plate for reflecting the light emitted to the rear of the straight tube lamp to the front of the lamp, a light guide plate for guiding the light reflected from the reflecting plate and the light emitted directly to the front of the lamp, and incident light provided on an upper surface of the light guide plate. In the backlight device for a liquid crystal display device having a diffusion plate for diffusing to the upper surface, The reflective plate includes a support plate for supporting the lamp and a reflective layer coated with a high reflective material on an inner wall of the support plate facing the lamp, wherein the support plate is made of a conductive metal material and provided at one side of the lamp. A connection portion for connecting the first electrode terminal is provided at a position corresponding to the second electrode terminal, and the second electrode terminal is electrically separated at a position corresponding to the second electrode terminal provided on the other side of the lamp to protrude outward. 1. A backlight device for a liquid crystal display device, wherein a through hole is provided to enable electrical connection with the outside at one side of the support plate near the second electrode terminal and the second electrode terminal. The apparatus of claim 1, further comprising a connection connector electrically connected at a predetermined position in the vicinity of the second electrode terminal of the support plate to relay electrical conduction to an external power source to the lamp. A backlight device for a liquid crystal display device characterized by the above-mentioned. The method of claim 1, wherein the connecting portion is a second through hole through which the first electrode terminal passes, and the predetermined region of the support plate around the first electrode terminal and the second through hole passing through the second through hole is lead dam. A backlight device for a liquid crystal display device, characterized in that interconnected by. The backlight device of claim 1, wherein an insulating ring member is inserted along the inner wall of the first through hole to electrically insulate the second electrode terminal and the support plate.