JPH04366815A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To easily replace back lights which are assembled because of a fault or the end of life by making reflecting plates of the back light incorporated in the liquid crystal display device devidable and detachable. CONSTITUTION:The liquid crystal display device is provided with the detachable reflecting plates 11a and 11b and a back light holder part 3 which can be detached to the reflecting plate side and then when the back lights 2a and 2b are replaced owing to a fault or the end of life, the reflecting plates 11a and 11b are detached to expose the back lights 2a and 2b, which can easily be replaced without detaching any of a lid case 8, a liquid crystal panel 5, printed wiring boards 7a and 7b, and a light diffusion plate 4 nor extending connection cables 6a and 6b. Consequently, the man-hours decrease and the possibility of the breakage of the liquid crystal panels 5a and 5b and connection cables 6a and 6a greatly decreases.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmissive liquid crystal display device having a built-in backlight.

0002

[Prior Art] Figure 3 shows a structural diagram of a conventional liquid crystal display device.
Figure 4 shows a cross-sectional view of the device, in which 1 is a main body case that also serves as a reflector, 2a and 2b are backlights, 3 is a backlight holder that holds the backlight, and 4 is a light diffusion plate. . 5a and 5b are liquid crystal panels, 6a and 6b are connection cables, 7a and 7b are printed wiring boards, and 8 is a lid case.

In the conventional liquid crystal display device configured as described above, the main body case 1 first includes a backlight 2a,
2b with the backlight holder part 3, and the light diffusing plate 4
was implemented. Thereafter, liquid crystal panels 5a and 5b were mounted, connection cables 6a and 6b were bent, printed wiring boards 7a and 7b were mounted so as to surround main body case 1, and lid case 8 was engaged.

0004

[Problems to be Solved by the Invention] However, in the above-described configuration, when the backlights 2a and 2b are replaced due to failure or lifespan, the brightness of the backlights is significantly reduced or the backlights do not light up, the lid case 8 must be replaced. Remove the printed wiring boards 7a, 7b, stretch out the bent connection cables 6a, 6b, and connect the LCD panel 5.
It can only be replaced after removing the LCD panels 5a, 5b and the light diffusing plate 4, but at that time the liquid crystal panels 5a, 5b and the connection cable 6.
There was a problem in that there was a high possibility that parts a and 6b would be damaged.

[0005] In view of the above, the present invention has been developed to prevent malfunctions or
An object of the present invention is to provide a liquid crystal display device in which a backlight that has reached the end of its life can be easily replaced.

[0006]

[Means for Solving the Problems] The present invention includes a backlight holder part that is provided in a main body case and that removably holds a backlight, and a backlight holder part that reflects light from the backlight and that is removably attached to the main body case. The configuration includes a reflective plate provided.

[0007]

[Operation] According to the above-described structure, when the backlight malfunctions or reaches the end of its service life after assembly, the present invention allows other members such as the lid case, liquid crystal panel, printed wiring board, and light diffusion plate to be removed by removing the reflector. You can easily replace just the backlight.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a structural diagram of a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a sectional view thereof. In FIG. 1, 11a and 11b are reflecting plates, and the reflecting plate 11a
, 11b are removably provided in the main body case 12. 2a and 2b are backlights, 3 is a side wall 3a
, 3b are formed with U-shaped grooves 3c, 3d, 3e, 3f, respectively, and are removably provided on the reflecting plate side. 4 is a light diffusion plate, 5 is a liquid crystal panel, 6a, 6
b is a connection cable, 7a and 7b are printed wiring boards, and 8 is a lid case, which connects the input terminals arranged on multiple opposing sides of the liquid crystal panel 5 and the printed wiring boards 7a and 7b arranged at acute angles to the display screen. Output terminal is connected.

The operation of the liquid crystal display device of this embodiment constructed as described above will be explained below.

During assembly, the backlights 2a and 2b are fixed to the main body case 12 with the backlight holder part 3, and the reflectors 11a and 11b are attached, and then the light diffusion plate 4 and the liquid crystal panels 5a and 5b are mounted. Connection cable 6a
, 6b, and mount the printed wiring boards 7a and 7b so as to wrap around the main body case 1, and engage the lid case 8.
The number of steps for attaching the reflectors 11a and 11b increases by one step.

However, after assembly, when the backlight 2 breaks down or reaches the end of its service life and needs to be replaced, the backlights 2a, 2b are exposed by removing the reflectors 11a, 11b in the removal direction (arrow A), and the reflectors 11a, 11b are removed. The backlight holder part 3, which can be removed in the direction of arrow A, allows the lid case 8, liquid crystal panel 5a,
5b, only the backlight 2 can be replaced without removing the printed wiring boards 7a, 7b and the light diffusion plate 4, and without extending the connection cables 6a, 6b, so the number of steps is reduced by 5 steps, and the liquid crystal panels 5a, 5b are replaced. , connection cables 6a, 6
The possibility of damage to b is also greatly reduced.

As described above, according to this embodiment, by providing the liquid crystal display with a removable reflector and a removable backlight holder on the reflector side, only the backlight can be easily replaced after assembly. can do.

[0013] In this embodiment, it is possible to further divide the removable reflector into a larger number of parts to facilitate removal.

Furthermore, in this embodiment, it is possible to use the backlight holder section as a separate member for electrode connection.

Furthermore, in this embodiment, the removable reflecting plate can be made of a material having high thermal conductivity and can also serve as a heat sink.

[0016]

As described above, according to the present invention, by removing the reflective plate of the liquid crystal display device after assembly, only the backlight can be easily replaced, which has a great practical effect.

[Brief explanation of drawings]

FIG. 1 is a structural diagram of a liquid crystal display device according to an embodiment of the present invention when it is mounted.

[Figure 2] Cross-sectional view of the device

[Figure 3] Structural diagram when mounting a conventional liquid crystal display device

[Figure 4]
Cross-sectional view of the device

[Explanation of symbols]

2a, 2b Backlight 3 Backlight holder part 4. Light diffusion plate 5.LCD panel 6a, 6b connection cable 7a, 7b Printed wiring board 8 Lid case 11a, 11b Reflector plate 12 Main body case

Claims (1)

[Claims] 1. A backlight holder part that is provided in the main body case and that removably holds a backlight; 1. A liquid crystal display device comprising a reflective plate.