JPH0519276A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To restrain the quantity of radio wave radiated from a display surface without damaging a liquid crystal display at all by providing a solid pattern transparent electrode at the part on a display surface side other than the driving electrode of a liquid crystal panel and connecting the solid pattern transparent electrode to ground. CONSTITUTION:The solid pattern transparent electrode 21 is provided at the part on the display surface 25 side other than the X-direction driving electrode 5 and the Y-direction driving electrode 8 of the liquid crystal panel 11. The electrode 21 is connected to the ground through a flexible printed board 21. The electrode 21 connected to the ground absorbs the radio wave generated from the electrodes 5 and 8 and acts to restrain the radiation of the radio wave from the display surface 25. In the case of absorbing the radio wave 14 and restraining the radiation thereof, it is effective that the electrode 21 is a solid pattern. Since the electrode 21 is transparent, in such a case, the display of a display device 20 is not influenced by it at all.

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.

In recent years, in liquid crystal display devices, the display screen is becoming larger, and along with this, the outer shape of the liquid crystal panel is becoming larger.

As the size of the liquid crystal panel becomes larger, the frequency of the clock signal for driving the liquid crystal panel becomes higher, and the amount of radio waves emitted from the liquid crystal panel increases, which may affect peripheral devices.

Therefore, it is necessary to suppress the amount of radio waves emitted from the liquid crystal panel.

[0005]

2. Description of the Related Art FIG. 4 shows an example of a conventional liquid crystal display device 1.

Reference numeral 2 denotes an upper glass, which has a polarizing plate 4 on the upper surface of the glass plate 3 and an X-direction drive electrode 5 on the lower surface.

Reference numeral 6 is a lower glass, which has a Y-direction drive electrode 8 on the upper surface of a glass plate 7 and a polarizing plate 9 on the lower surface.

The upper glass 2 and the lower glass 6 are combined with the liquid crystal 10 sandwiched therebetween to form a liquid crystal panel 11.

A tab 13 on which an IC chip 12 is mounted is connected to the X-direction drive electrode 5.

Although not shown, a tab having an IC chip mounted thereon is also connected to the Y-direction drive electrode 8.

The electrode patterns 5 and 8 are selectively energized by the IC chip 12, and a predetermined display is made by the liquid crystal.

Electric waves 14 are inevitably generated from the drive electrodes 5 and 8 by energizing the drive electrodes 5 and 8.

[0013]

The above-mentioned liquid crystal display device 1
Has no means for suppressing the emission of the radio wave 14, and the radio wave 14 may be emitted from the display surface 15 side and adversely affect peripheral devices.

An object of the present invention is to provide a liquid crystal display device capable of suppressing the emission of radio waves from the display surface side.

[0015]

According to a first aspect of the present invention, a transparent electrode having a solid pattern is provided at a portion closer to a display surface than a drive electrode of a liquid crystal panel, and the transparent electrode having the solid pattern is connected to a ground. It was done.

[0016]

The solid pattern transparent electrode connected to the ground acts to absorb the radio wave generated from the drive electrode.

The configuration in which the electrodes have a solid pattern acts so as to efficiently absorb radio waves.

The structure in which the electrodes are transparent acts so as not to damage the display.

[0019]

FIG. 1 shows a liquid crystal display device 2 according to the first embodiment of the present invention.
Indicates 0.

In the figure, parts corresponding to the parts shown in the figure are designated by the same reference numerals.

Reference numeral 21 is a solid pattern transparent electrode (ITO)
And is formed on the entire upper surface of the glass plate 3.

The solid pattern transparent electrode 21 is connected to the ground (GND) via a flexible printed board 22.

The polarizing plate 4 is provided on the solid pattern transparent electrode 21.

The solid pattern transparent electrode 21 is set to the GND potential and has an electromagnetic shield function.

As a result, the radio wave 14 generated from the drive electrodes 5 and 8 is absorbed by the solid pattern transparent electrode 21, and the emission of the radio wave from the display surface 25 is suppressed.

Since the electrode 21 has a solid pattern, the radio wave 14 is effectively absorbed, and the emission of the radio wave from the display surface 25 is effectively suppressed.

Since the electrode 21 is transparent, the device 2
The display of 0 has no effect.

FIG. 2 shows a liquid crystal display device 30 according to the second embodiment of the present invention.

This embodiment is applied to a liquid crystal display device having a phase compensating plate, and in FIG. 2, parts corresponding to those shown in FIG. 1 are designated by the same reference numerals.

Reference numeral 31 is a phase compensating plate for enabling monochrome display, which is provided on the upper surface side of the liquid crystal panel 11.

The phase compensating plate 31 has a structure in which glass plates 32 and 33 are combined with a liquid crystal 34 in between.

A transparent electrode 35 having a solid pattern is formed on the entire lower surface of the glass plate 32 and is connected to the ground (GND) through a flexible printed board 36.

The solid pattern transparent electrode 35 exerts an electromagnetic shield function, and the radio wave 1 generated from the drive electrodes 5 and 8
Absorbs 4.

As a result, the emission of radio waves from the display surface 37 is suppressed.

FIG. 3 shows a liquid crystal display device 40 according to the third embodiment of the present invention.

This embodiment is applied to a liquid crystal display device having a phase compensation film, and in FIG. 3, parts corresponding to those shown in FIG. 4 are designated by the same reference numerals.

Reference numeral 41 denotes a phase compensation film for enabling black and white display, which is adhered to the upper surface of the polarizing plate 4.

Reference numeral 42 denotes a transparent electrode having a solid pattern, which is formed on the entire upper surface of the glass plate 3 and is connected to the ground (GND) via the flexible printed board 43.

The solid pattern transparent electrode 42 exerts an electromagnetic shield function, and the radio wave 1 generated from the drive electrodes 5 and 8
Absorbs 4.

As a result, the emission of radio waves from the display surface 44 is suppressed.

[0041]

As described above, according to the present invention, the amount of radio waves radiated from the display surface can be suppressed without damaging the liquid crystal display.

[Brief description of drawings]

FIG. 1 is a diagram showing a main part of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a main part of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a main part of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 4 is a diagram showing an example of a conventional liquid crystal display device.

[Explanation of symbols]

 2 Upper glass 3,7,32,33 Glass plate 4,9 Polarizing plate 5 X-direction drive electrode 6 Lower glass 8 Y-direction drive electrode 10,34 Liquid crystal 11 Liquid crystal panel 14 Radio waves 20,30,40 Liquid crystal display device 21,35 , 42 Solid pattern transparent electrode 22, 36, 43 Flexible printed board 25, 37, 44 Display surface 31 Phase compensation plate 41 Phase compensation film

Claims (1)

Claims: 1. A drive electrode (5, 5) of a liquid crystal panel (11).
8), a transparent electrode (21, 35, 42) having a solid pattern is provided in a portion closer to the display surface (25, 37, 44), and the transparent electrode (21, 35, 42) is connected to the ground. A liquid crystal display device having a configuration.