Liquid crystal display device having an improved liquid-crystal-panel drive circuit configuration

• US 20030156086A1
• Filed: 02/19/2003
• Published: 08/21/2003
• Est. Priority Date: 02/19/2002
• Status: Active Grant

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Nakagawa, Hideki, Maeda, Toshio, Watanabe, Akihiro, Maruoka, Yoshio, Misonou, Toshiki
• Granted Patent: US 7,209,103 B2
• Time in Patent Office: Days
• US Class Current: 345/89
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/0606 Manual adjustment
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• CPC Class Codes: G09G 2340/04 Changes in size, position or resolution of an image
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04
• CPC Class Codes: H04N 9/3105 for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators simultaneous projection in colour photography G03B33/10; beam splitting or combining systems per se G02B27/10

Abstract

A liquid crystal display device has a liquid crystal display panel and a display control device coupled to the liquid crystal display panel. The display control device is composed of a first section for receiving an externally supplied video signal, and a second section succeeding the first section and coupled to the liquid crystal display panel. The second section is formed of a circuit for amplifying and converting the video signal into an ac signal supplied from the first section, and a drive pulse circuit for outputting drive pulses for driving the liquid crystal display panel. The first section and the second section are fabricated on first and second substrates separate from each other, respectively. The second section is disposed proximately to the liquid crystal display panel, and the first section and the second section are coupled via a flexible cable.

Claims

1. A liquid crystal display device having a liquid crystal display panel and a display control device coupled to said liquid crystal display panel,

said display control device comprising a first section for receiving an externally supplied video signal, and a second section succeeding said first section and coupled to said liquid crystal display panel,

wherein

said second section comprises a circuit for amplifying and converting said video signal into an ac signal supplied from said first section, and a drive pulse circuit for outputting drive pulses for driving said liquid crystal display panel,

said first section and said second section are fabricated on first and second substrates separate from each other, respectively,

said second section is disposed proximately to said liquid crystal display panel, and

said first section and said second section are coupled via a flexible cable.

2. A liquid crystal display device according to claim 1, wherein said second section further comprises at least one of

a circuit for performing data rate conversion of said video signal,

a circuit for performing gamma correction of said video signal,

a circuit for performing display resolution conversion of said video signal,

a digital-to-analog converter for converting said video signal in digital form to an analog signal,

a sample-and-hold circuit for sampling and holding said video signal, and

a circuit for phase-expanding said video signal.

3. A liquid crystal display device according to claim 1, wherein said video signal is supplied to said second section from said first section in differential-amplitude-mode.

4. A liquid crystal display device according to claim 1, wherein said second section further comprises a circuit for increasing a data rate of said video signal by a factor of two or more.

5. A liquid crystal display device according to claim 1, wherein said second substrate is disposed level with one of a pair of substrates sandwiching a liquid crystal layer of said liquid crystal display panel.

6. A liquid crystal display device according to claim 1, wherein said second substrate is one of a pair of substrates sandwiching a liquid crystal layer of said liquid crystal display panel.

7. A liquid crystal display device according to claim 1, wherein said second substrate is attached on an outer surface of one of a pair of substrates sandwiching a liquid crystal layer of said liquid crystal display panel.

8. A liquid crystal display device according to claim 1, wherein said second section is fabricated on an outer surface of one of a pair of substrates sandwiching a liquid crystal layer of said liquid crystal display panel.

9. A liquid crystal display device comprising:

a plurality of liquid crystal display panels for producing three primary color images,

each of said plurality of liquid crystal display panels having first and second substrates, a liquid crystal layer sandwiched between said first and second substrates, and a plurality of pixels formed on said first substrate;

a plurality of drive circuits each provided for a corresponding one of said plurality of liquid crystal display panels and supplying a video signal to each of said plurality of pixels; and

a plurality of liquid crystal display panel drive control circuits each provided for a corresponding one of said plurality of liquid crystal display panels,

each of said plurality of liquid crystal display panel drive control circuits supplying control signals and said video signals to a corresponding one of said plurality of drive circuits,

wherein

each of said plurality of liquid crystal display panel drive control circuits corresponding to one of said plurality of liquid crystal display panels is controlled independently of another of said plurality of liquid crystal display panel drive control circuits corresponding to another of said plurality of liquid crystal display panels.

10. A liquid crystal display device according to claim 9, further comprising a plurality of power supply circuits each corresponding to one of said plurality of liquid crystal display panels, wherein

said plurality of power supply circuits are disposed separately from each other, and each of said plurality of power supply circuits is controlled independently of another of said plurality of power supply circuits.

11. A liquid crystal display device according to claim 9, wherein said first substrate is made of silicon.