JPH10104598A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the foreign matter intruding into an illumination unit at the time of assembling the parts of this unit from appearing after the completion of a liquid crystal display device, to prevent the defect by the degradation in a display grade and to improve productivity and reliability by providing the boundary built with a liquid crystal module and the illumination unit with a dustproof member. SOLUTION: A silicone tape 34 which is the dustproof member is stuck to the boundary of a back light unit 24 and the prism sheet 28 on the circumference of an assembled frame 26, by which the back light unit 24 is sealed. In case the foreign matter is not completely removed by cleaning after assembly of the back light unit 24 of such device, the boundary of the assembled frame 26 and the prism sheet 28 is closed by the silicone tape 34 and the emergence of the foreign matter from the back light unit 24 does not arise even if the foreign matter moves in the assembled frame 26 during the transportation after packing. Then, the intrusion of the foreign matter between the liquid crystal module and the back light unit 24 and the appearance thereof in the display region do not arise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device for displaying an image by superimposing a liquid crystal module and a flat lighting unit and displaying the image. In particular, foreign matter is present in a display area between the liquid crystal module and the lighting unit. The present invention relates to a liquid crystal display device that prevents appearance.

[0002]

2. Description of the Related Art Generally, in a transmissive liquid crystal display device, as shown in FIG.
Prism sheet 3, diffusion plate 4, light guide plate 6, reflection sheet 7
And the liquid crystal module 11 is mounted on the front surface of the backlight unit 10 fixed by the holding frame 8 to form the liquid crystal module 11.

In such an apparatus, during the operation of assembling the prism sheet 3, the diffusion plate 4, the light guide plate 6, the reflection sheet 7 and the like into the built-in frame 1 at the time of assembling the backlight unit 10, the built-in frame 1 is used. When the backlight 10 is incorporated, the foreign matter may enter between the built-in frame 1 and the liquid crystal module 11 when the foreign matter enters the liquid crystal module 11 or when the liquid crystal module 11 is incorporated.
In addition, cleaning was performed at the time of assembling the liquid crystal module 11 to remove foreign substances mixed therein.

[0004]

However, in spite of such cleaning, it is difficult to completely remove the foreign matter. Particularly, in the case of the backlight unit, the foreign matter is mixed during the operation of assembling a plurality of parts. Foreign matter was left on the built-in frame.

[0005] After the liquid crystal display device is completed, the remaining foreign matter moves while the liquid crystal display device is being moved by packing or transporting the liquid crystal display device, and comes out from between the built-in frame and the prism sheet, and comes out of the backlight unit. Between the LCD module and the LCD module, foreign matter appears in the display area of the liquid crystal display device, and a defect occurs due to a decrease in display quality.
There has been a problem that the yield is reduced.

[0006] For this reason, cleaning at the time of assembling is strengthened, a foreign object is forcibly appeared by a shock inspection after completion to remove defective products, and furthermore, the packaging and transportation of the finished product is improved to reduce the appearance of foreign materials. Despite such measures, it has not been possible to reliably prevent the appearance of foreign matter, and the appearance of foreign matter still causes defective products due to the deterioration of display quality. In addition to lowering the yield, there has been a problem that the reliability of the liquid crystal display device is impaired since the product has been shipped.

Accordingly, the present invention has been made to solve the above problems, and prevents foreign substances from appearing in the display area thereof after completion of a liquid crystal display device even if foreign substances remain in the built-in frame after cleaning. It is an object of the present invention to provide a highly reliable liquid crystal display device while preventing the occurrence of defective products by improving the yield and improving the productivity by improving the yield.

[0008]

According to the present invention, there is provided a liquid crystal module having a liquid crystal display portion having electrodes and having a liquid crystal composition sealed in a gap between electrode substrates opposed to each other, and a liquid crystal module having the same. A liquid crystal display device comprising a module and a lighting unit having a plate-shaped light irradiating section having substantially the same size as the module, wherein the light irradiating section is stacked and incorporated so as to irradiate the liquid crystal module; A dustproof member is provided at the interface to prevent foreign matter from entering between the liquid crystal module and the lighting unit.

With the above structure, the present invention prevents dust from entering between the liquid crystal module and the lighting unit by providing a dustproof member at the interface between the liquid crystal module and the lighting unit, and generates defective products due to a decrease in display quality. To prevent
As a result, the productivity and the reliability of the liquid crystal display device are improved by improving the yield. Further, the present invention eliminates the need for conventional measures for strengthening cleaning or strengthening inspections for finding defective products, and improves productivity by improving workability during cleaning and inspection.

[0010]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS.

FIG. 1 is a dispersion perspective view of a liquid crystal display device 20, and reference numeral 21 denotes a liquid crystal having electrodes (not shown) and a liquid crystal composition (not shown) sealed between opposed transparent substrates. This is a liquid crystal module including a display element 22 and a printed circuit board 23 having a drive circuit. 24 is the built-in frame 2
6 is a backlight unit, which is an illumination unit that incorporates a lamp 27, a prism sheet 28, a diffusion plate 30, a light guide plate 31, which is a flat light irradiation unit, and a reflection sheet 32, and is fixed by a holding frame 33.

At the interface between the backlight unit 24 and the prism sheet 28 around the built-in frame 26, a silicon (Si) tape 34 as a dustproof member is attached, and the backlight unit 24 is sealed. Then, on the front surface of the prism sheet 28 of the backlight unit 24 sealed with the silicone tape 34, the liquid crystal module 21 is mounted on the mounting frame 26, and a switch panel (not shown) is further attached to form the liquid crystal display device 20. .

In the liquid crystal display device 20 constructed as described above, when only the components of the backlight unit 24 are incorporated, foreign matter enters between the components and the built-in frame 26. Therefore, cleaning is performed after the backlight unit 24 is assembled.
If the foreign matter is not completely removed by this cleaning, the interface between the built-in frame 26 and the prism sheet 28 is blocked by the silicone tape 34 even if the foreign matter moves in the built-in frame 26 during transportation after packing. Therefore, the foreign matter does not come out of the backlight unit 24. Therefore, there is no possibility that foreign matter enters between the liquid crystal module 23 and the backlight unit 24 and appears in the display area, and a good display can be obtained.

With this configuration, even if foreign matter remains in the backlight unit 24, the silicon tape 34 reliably prevents the foreign matter from moving to the display area. In addition, it is possible to prevent display defects due to foreign matter, prevent defects from occurring due to deterioration of display quality, and improve the yield. Further, it is possible to enhance the cleaning or the shock inspection and the like which have been conventionally performed, to improve the workability at the time of assembling and inspection, and to improve the productivity. In addition, packing and transportation can be simplified, and costs can be reduced.

The present invention is not limited to the above-described embodiment, but can be modified without departing from the spirit of the invention, and the structure of the liquid crystal module and the lighting unit is arbitrary. Also, the dust-proof member is not tape-shaped, but may be a sealant applied. If the attachment position can prevent foreign matter from entering between the liquid crystal module and the lighting unit, FIG. The liquid crystal module 3 as shown in another modified example
6 is coated with a silicon (Si) sealant 38 around the junction with the lighting unit 37, thereby closing the interface with the lighting unit 37 and incorporating the liquid crystal module 36 and the lighting unit 37. In addition, foreign matter may be prevented from entering between the lighting units 37.

[0016]

As described above, according to the present invention, by providing a dustproof member at the interface incorporating the liquid crystal module and the lighting unit, even if foreign matter remains in the lighting unit, the dustproof member is provided between the liquid crystal module and the lighting unit. It is possible to reliably prevent a foreign substance from entering, appearing in the display area, and causing display defects. Therefore, it is possible to prevent the occurrence of defective products due to the deterioration of display quality due to the appearance of foreign matter after the completion of the liquid crystal display device, and to improve the yield and the productivity. In addition, the cleaning and the foreign substance detection inspection for removing the foreign substance can be simplified as compared with the related art, and the productivity can be improved because the workability can be improved. Moreover, the occurrence of defective products after shipment can be reduced, and the reliability of the device can be improved.

[Brief description of the drawings]

FIG. 1 is an internal perspective view of a liquid crystal display device according to an embodiment of the present invention, with a part thereof being omitted.

FIG. 2 is an explanatory diagram illustrating a part of the backlight unit according to the embodiment of the present invention as viewed from a cross section.

FIG. 3 is an explanatory diagram illustrating a cross-sectional view of a part showing a state where the backlight unit and the liquid crystal module according to the embodiment of the present invention are assembled.

FIG. 4 is an explanatory view showing a part of a liquid crystal module according to another modification of the present invention as viewed from a cross section.

FIG. 5 is a partially dispersed perspective view showing the inside of a liquid crystal display device of a conventional device, which is partially omitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Liquid crystal display device 21 ... Liquid crystal module 22 ... Liquid crystal display element 24 ... Backlight unit 26 ... Built-in frame 27 ... Lamp 28 ... Prism sheet 31 ... Light guide plate 34 ... Silicon tape

Claims (3)

[Claims] 1. A liquid crystal module having a liquid crystal display unit having electrodes and having a liquid crystal composition sealed in a gap between electrode substrates facing each other, and a plate-shaped light irradiating unit having substantially the same size as the liquid crystal module. In a liquid crystal display device, wherein a lighting unit and a light irradiating unit are stacked and incorporated so as to irradiate the liquid crystal module, provided at an interface between the liquid crystal module and the lighting unit, between the liquid crystal module and the lighting unit. A liquid crystal display device comprising a dustproof member for preventing foreign matter from entering. 2. The liquid crystal display device according to claim 1, wherein the dustproof member is provided around the lighting unit that is in contact with the liquid crystal module when the liquid crystal module is assembled. 3. The liquid crystal display device according to claim 1, wherein the dustproof member is provided around the liquid crystal module that is in contact with the lighting unit when being assembled.