JP2919092B2 - Transmissive liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission type liquid crystal display device used for a display of a personal computer or the like.

[0002]

2. Description of the Related Art FIG. 4 is a partial sectional view of a conventional liquid crystal display device of this kind. As shown in FIG.
Is a thin film transistor panel (hereinafter, referred to as a TFT panel) 2, a color filter panel (hereinafter, referred to as a CF panel) 3 joined to the TFT panel 2 by a sealant 4, and a liquid crystal filled between the two panels. , And polarizing plates 5 and 6 arranged on the lower surface of the TFT panel 2 and the upper surface of the CF panel 3.

[0003] Pixel electrodes made of a transparent conductive film are provided in a matrix on a TFT substrate. Each pixel electrode is connected to a thin film transistor (both not shown) for controlling the application of a voltage to this electrode. I have. A transparent electrode and a matrix-shaped color filter (both not shown) are formed on the lower surface of the CF panel, and a light-blocking film 7 in a square shape is formed on the outer periphery of the color filter.

[0004] A hybrid IC substrate (hereinafter referred to as an HIC substrate) 8 reinforced by a reinforcing plate 9 is connected to the TFT panel 2. Sealed by 10.

[0005] The liquid crystal panel 1 is held by the back shield case 12 by the support member 13, and the outer peripheral portions of the HIC substrate 8 and the liquid crystal panel 1 are housed in a shield case composed of the front shield case 11 and the back shield case 12. I have. A protective panel 15 is fixed to the front shield case 11 using a double-sided adhesive tape 14.

In this transmission type liquid crystal display device, part of the incident light a from the light source is emitted as transmitted light b through the liquid crystal panel 1.

[0007]

In the display area, there is no direct
Unnecessary transmitted light is blocked by a light-shielding film that covers the periphery of the pixel.
Although it is shielded, the sealant 4 out of the incident light from the light source
The light c traveling toward the front side is reflected here, and the reflected light d passes through the gap between the front side shield case 11 and the polarizing plate 6 and exits to the front side through the protection panel 15 and becomes a bright line on the display screen. Appears. This disturbing light makes the screen unsightly and makes the eyes of those who operate the device while watching the display unusually tired.

In the conventional liquid crystal display device, there is a gap between the front shield case 11 and the CF panel 3, and
From the portion where the IC substrate 8 is stored, the protection panel 15
The structure is such that dust easily enters between the substrate and the polarizing plate 6. If dust adheres to the display screen, the product becomes defective and must be removed. However, there is an inconvenience that the protective panel 15 must be peeled off to remove it.

[0009]

The transmissive liquid crystal display device of the present invention has a structure in which liquid crystal is filled between two transparent substrates by being surrounded by a sealant provided on a peripheral portion of these substrates. Further, a light-shielding tape for blocking the reflected light of the illumination light by the sealant is provided on the surface of the front transparent substrate.
It is stuck so as to straddle the case .

The outer peripheral portions of the two transparent substrates are accommodated in a shield case, and the light-shielding tape is attached, for example, from the front transparent substrate or a polarizing plate disposed thereon to the front inner portion of the shield case. You.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial sectional view of a first embodiment of the present invention, and FIG. 2 is a plan view thereof. 1 and 2, the same parts as those of the conventional example shown in FIG. 4 are denoted by the same reference numerals, and thus redundant description will be omitted.

In this embodiment, a light-shielding tape 16 is applied from the end of the polarizing plate 6 on the CF panel 3 to the sealing resin 10 so as to cover the sealing agent 4.

When the light-shielding tape is stuck on the CF panel 3 as described above, the light d reflected by the sealant 4 is blocked by the light-shielding tape, so that it does not exit to the protection panel side. .

FIG. 3 is a partial sectional view of a second embodiment of the present invention. This embodiment is different from the previous embodiment shown in FIG. 1 only in the position where the light-shielding tape is adhered. In this embodiment, the light-shielding tape 16 is attached to the front-side shield case 11 so as to block the transmission of the reflected light and close the gap between the front-side shield case 11 and the polarizing plate 6 pasted on the CF panel 3. It is attached from a position slightly outside the inner edge to a position on the light shielding film 7 on the polarizing plate 6.

Since the light-shielding tape 16 is adhered as described above, the reflected light d does not leak onto the display screen in this embodiment. Furthermore, the light-shielding tape 16 in this embodiment
Has a function of preventing dust from inside the shield case housing the HIC substrate 8 from entering between the protection panel 15 and the polarizing plate 6. In fact, in this embodiment, the provision of this light-shielding tape could reduce the number of dust intrusion accidents to 1/10 or less.

[0016]

As described in the foregoing, the present invention provides a transmission type liquid crystal display device, the said sealing agent inside the seal material provided so as to confine the liquid crystal between two transparent substrates
According to the present invention, it is possible to prevent the light reflected by the sealant from leaking onto the display screen because the light-shielding tape is adhered so as to block the reflected light of the illumination light .

Furthermore, if the space between the liquid crystal panel and the protection panel is separated from the space for storing the hybrid IC by the light-shielding tape, the internal dust from the portion where the hybrid IC is stored can be removed from the liquid crystal panel and the protection panel. Can be prevented from penetrating into the gap between them.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a first embodiment of the present invention.

FIG. 2 is a plan view of the first embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a second embodiment of the present invention.

FIG. 4 is a partial sectional view of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 liquid crystal panel 2 thin film transistor panel (TFT panel) 3 color filter panel (CF panel) 4 sealant 5, 6 polarizing plate 7 light shielding film 8 hybrid IC substrate (HIC substrate) 9 reinforcing plate 10 sealing resin 11 front shield case 12 back shield Case 13 support member 14 double-sided adhesive tape 15 protective panel 16 light-shielding tape

Claims (1)

(57) [Claims] 1. A first and a second, each having a transparent electrode.
Are laminated through a narrow gap, and a polarizing plate is provided in close contact with the outer surface of each of the first and second transparent substrates, and between the first and second transparent substrates. The liquid crystal is filled by being sealed by a sealant provided on a peripheral portion of the substrate, illumination light is irradiated from the back surface side of the first transparent substrate, and transmission of the illumination light is transmitted to an outer peripheral portion of the second transparent substrate. In a transmissive liquid crystal display device provided with a light shielding film for preventing light transmission , an outer peripheral portion of the transmissive liquid crystal display device is provided.
A shielding case for storing the light, and a light-shielding tape that blocks reflected light of the illumination light by the sealant is reduced.
Both of which overlap with a part of the light-shielding film and the second transparent group.
A transmissive liquid crystal display device, which is attached from the polarizing plate on the plate to the shield case .