Liquid crystal television receiver

• US 4,562,478 A
• Filed: 02/14/1983
• Issued: 12/31/1985
• Est. Priority Date: 02/18/1982
• Status: Expired due to Fees

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: Kameda, Osamu, Hirasawa, Yukinori
• Primary Examiner(s): Chin, Tommy P.
• Application Number:
  US06/466,209
• Time in Patent Office: 1,051 Days
• Field of Search: 340/784, 340/765, 358/236, 350/338, 315/169.3
• US Class Current: 348/794
• CPC Class Codes: G02F 1/133602 Direct backlight
• CPC Class Codes: G02F 1/133626 providing two modes of illumination, e.g. day-night
• CPC Class Codes: G09G 3/2011 by amplitude modulation
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: H04N 3/127 using liquid crystals

Abstract

Within a case a main television circuit, a liquid crystal display panel for producing an image on a front side thereof, an EL light illuminating panel and a driving circuit which is driven to cause said EL light illuminating panel to emit light are accommodated. The EL light illuminating panel is mounted on the reverse side of said crystal display panel so as to emit light through and out of the front side of the panel.

Claims

1. A liquid crystal television receiver, comprising:

a television circuit;

a liquid crystal display panel coupled to said television circuit for producing a television picture image on a front side thereof;

light illuminating means facing a reverse side of said liquid crystal display panel opposite said front side for emitting light through and out of the front side of said panel;

a tuning detection circuit for detecting a tuned state wherein said television circuit is tuned to a television signal wave;

a driving circuit adapted to drive said light illuminating means to permit light emission only when said tuning detection circuit detects said tuned state; and

a case for holding said television circuit, liquid crystal display panel, light illuminating means, tuning detection circuit and driving circuit in operative relation therein.

2. A liquid crystal television receiver according to claim 1, in which said light illuminating means is arranged to be driven in a push-pull fashion.

3. A liquid crystal television receiver according to claim 1, in which said light illuminating means is of an electroluminescent type.

4. A liquid crystal television receiver according to claim 1, including a layer of coloring light on at least one of the front and reverse sides of said liquid crystal display panel.

5. A liquid crystal television receiver according to claim 4, in which said layer of coloring light is formed by a color polarizer.

6. A liquid crystal television receiver according to claim 4, in which said layer of coloring light is formed by a color filter.

7. A liquid crystal television receiver according to claim 1, in which said light illuminating means is a color light illuminating panel.

8. A liquid crystal television receiver according to claim 1, in which said light illuminating means is an electroluminescent color light illuminating panel.

9. A liquid crystal television receiver according to claim 1, in which said light illuminating means is a color light illuminating panel and said liquid crystal display panel includes at least one of a color polarizer and a color filter.

10. A liquid crystal television receiver according to claim 1, wherein said light illuminating means comprises an electroluminescent panel, and comprising a half mirror disposed between said liquid crystal display panel and said electroluminescent panel, and said case holds said half mirror in operative relation therein.

11. A liquid crystal television receiver according to claim 1, wherein said receiver further includes a connecting circuit adapted to make an electrical connection between said illuminating means and said driving circuit when said light illuminating means is attached to said connecting circuit;

said light illuminating means is detachably attached to said liquid crystal display panel; and

said case has an opening for permitting attachment and detachment of said light illuminating means and also holds said connecting circuit.