Substrate for liquid crystal panel and its production method, liquid crystal display panel and electronic apparatus

• US 20030218706A1
• Filed: 03/03/2003
• Published: 11/27/2003
• Est. Priority Date: 03/05/2002
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Otagiri, Yoshihiro, Takizawa, Keiji, Nakano, Tomoyuki
• Granted Patent: US 6,888,594 B2
• Time in Patent Office: Days
• US Class Current: 349/110
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133388 with constructional differences between the display region and the peripheral region
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133555 Transflectors

Abstract

A first shading region for defining a display region is arranged on a light-transmitting substrate. A cell thickness adjustment layer is arranged on the substrate inside the display region and a second shading region for defining a boundary of a plurality of pixel regions is arranged on the cell thickness adjustment layer. The cell thickness adjustment layer is selected so that the total thickness of the second shading region is not smaller than the total thickness of the first shading region. The cell gap can thus be made uniform throughout the whole display region and non-uniformity of display can be prevented.

Claims

1. A substrate for a liquid crystal panel comprising:

a substrate;

a first shading region arranged on said substrate and defining an outer edge of a display region;

a cell thickness adjustment layer arranged on said substrate inside said display region; and

a second shading region arranged on said cell thickness adjustment layer and defining boundaries of a plurality of pixel regions inside said display region;

wherein a thickness of said cell thickness adjustment layer is selected so that an overall thickness of said second shading region is not less than an overall thickness of said first shading layer.

2. The substrate for a liquid crystal panel as defined in claim 1, wherein said cell thickness adjustment layer further comprises a transparent resin.

3. The substrate for a liquid crystal panel as defined in claim 1, wherein:

said first shading region includes a superposition of coloring layers of red, blue and green and an overcoat layer;

said second shading region includes a superposition of coloring layers of red, blue and green and an overcoat layer; and

said coloring layers of red, blue and green and said overcoat layers contained in said first and second shading regions are respectively formed of the same materials.

4. The substrate for a liquid crystal panel as defined in claim 3, wherein a thickness of said cell thickness adjustment layer is selected so that an overall thickness of said second shading region is greater than a total thickness of said coloring layers and said overcoat layer contained in said first shading region.

5. The substrate for a liquid crystal panel as defined in claim 3, wherein said second shading region further includes a color filter layer, and a thickness T of said cell thickness adjustment layer is given by the following equation wherein a layer thickness of each of said coloring layers in said first and second shading layers is m, a layer thickness of said overcoat layers in said first and second shading regions is n and a layer thickness of said color filter layer in said second shading region is s:

T=(3m+n)−

(s+2m+n/2).

6. The substrate for a liquid crystal panel as defined in claim 3, wherein said cell thickness adjustment layer further comprises a transparent resin that is the same as the transparent resin of said overcoat layer.

7. A liquid crystal display panel including said substrate for a liquid crystal panel as defined in claim 1.

8. An electronic apparatus including said liquid crystal display panel as defined in claim 7 as a display portion.

9. A method of producing a substrate for a liquid crystal panel comprising:

a first step of forming a first shading region defining an outer edge of a display region on a substrate;

a second step of forming a cell thickness adjustment layer on said substrate inside said display region; and

a third step of forming a second shading region on said cell thickness adjustment layer and defining boundaries of a plurality of pixel regions inside said display region;

wherein a thickness of said cell thickness adjustment layer is selected so that an overall thickness of said second shading region is not less than an overall thickness of said first shading region.

10. A method of producing a substrate for a liquid crystal panel as defined in claim 9, wherein said cell thickness adjustment layer is formed of a transparent resin in said second step.

11. A method of producing a substrate for a liquid crystal panel as defined in claim 9, wherein:

said first step forms said first shading region by serially laminating coloring layers of red, blue and green and an overcoat layer;

said third step forms said second shading region by serially laminating coloring layers of red, blue and green and an overcoat layer; and

said first and second steps form said coloring layers of red, blue and green and said overcoat layers contained in said first and second shading regions by respectively using the same materials.

12. A method of producing a substrate for a liquid crystal panel as defined in claim 11, wherein a thickness of said cell thickness adjustment layer is selected so that an overall thickness of said second shading region is greater than a total thickness of said coloring layers and said overcoat layer contained in said first shading region.

13. A method of producing a substrate for a liquid crystal panel as defined in claim 11, wherein said third step forms a color filter layer on said cell thickness adjustment layer before said coloring layer of each color is formed, and a thickness T of said cell thickness adjustment layer is given by the following equation wherein a layer thickness of each of said coloring layers in said first and second shading regions is m, a layer thickness of said overcoat layers in said first and second shading regions is n and a layer thickness of said color filter layer in said second shading region is s:

T=(3m+n)−

(s+2m+n/2).

14. A method of producing a substrate for a liquid crystal panel as defined in claim 11, wherein said cell thickness adjustment layer is formed of the same transparent resin as that of said overcoat layer.