Liquid crystal display apparatus

• US 5,777,594 A
• Filed: 09/12/1996
• Issued: 07/07/1998
• Est. Priority Date: 09/13/1995
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Miyawaki, Mamoru
• Primary Examiner(s): Hjerpe, Richard A.
• Assistant Examiner(s): CHANG, KENT WU
• Application Number:
  US08/713,220
• Time in Patent Office: 663 Days
• Field of Search: 345/87, 345/88, 345/102, 349/161, 349/56
• US Class Current: 345/102
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element

Abstract

A liquid crystal display device is provided in which has a flat color filter substrate, and realizes higher contrast and larger picture size. For this purpose, light-intercepting layer is formed on TFT substrate, back light is placed on the side of TFT substrate, and a heat-radiating plate for the back light is placed between the back light and the liquid crystal panel to intercept light onto the non-display region.

Claims

1. A transmission-type liquid crystal display device comprising:

a liquid crystal panel having a displaying portion and a non-displaying portion, said non-displaying portion being arranged at a peripheral portion of said displaying portion, said liquid crystal panel comprising an active matrix substrate having a light-intercepting layer and a driving circuit arranged at the non-displaying portion;

a light source for irradiating the liquid crystal with a light through said active matrix substrate; and

a heat-radiating plate located between the light source and the active matrix substrate, wherein said heat-radiating plate prevents the irradiation of said non-displaying portion with the light from said light source.

2. A liquid crystal display device according to claim 1, wherein said counter substrate has a color filter.

3. A liquid crystal display device according to claim 2, wherein said color filter is provided on the display portion of said counter substrate and an alignment mark layer is provided on the non-displaying portion of a counter substrate.

4. A liquid crystal device according to claim 3, wherein said color filters are arranged discretely with intervals, and the breadth of the color filter is larger than the breadth of an aperture region of a picture element.

5. A liquid crystal device according to claim 4, wherein the aperture region of the picture element is defined by a light-intercepting layer.

6. A liquid crystal display device according to claim 1, wherein a reflection-preventing layer is formed on a counter substrate.

7. A liquid crystal display device according to claim 1, wherein said active matrix substrate has a picture element-switching element comprising a thin film transistor arranged at the displaying portion.

8. A liquid crystal display device according to claim 1, wherein the active matrix substrate comprises an Si substrate.

9. A liquid crystal display device according to claim 8, wherein the peripheral driving circuit on the non-display region is constituted of a monocrystalline Si transistor.