Liquid crystal display controller and liquid crystal display

• US 20010002828A1
• Filed: 11/30/2000
• Published: 06/07/2001
• Est. Priority Date: 12/02/1999
• Status: Active Grant

• Current Assignee: Vista Peak Ventures LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: NEC LCD Technologies Limited (NEC Corporation)
• Inventors: Nakamigawa, Kazuhiro
• Granted Patent: US 7,202,844 B2
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G09G 2300/0434 Flat panel display in which a field is applied parallel to the display plane
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

In a liquid crystal display controller, a digital image input signal is input to the controller for data-processing and output to a liquid crystal driver which drives a liquid crystal panel which can be normally white or normally black. The liquid crystal display controller comprises an inverter for inverting the digital image input signal, a selector for choosing and outputting the signal inverted by the inverter and the digital image input signal depending on a switching signal, and a data processor for controlling the voltage luminance (VT) of the signal transmitted by the selector and transmitting the signal to the liquid crystal driver.

Claims

1. A liquid crystal display controller in which a digital image input signal is input to and data-processed and the digital image input signal is output to a liquid crystal driver for driving a normally white or normally black liquid crystal panel, comprising;

an inverter for inverting the digital image input signal,

a selector for choosing and outputting the signal inverted by the inverter and the digital image input signal depending on a switching signal,

a data processor controlling a voltage luminance of the signal transmitted by the selector and transmitting the signal to the liquid crystal driver.

2. A liquid crystal display controller according to

claim 1

, wherein the switching signal shows whether the liquid crystal panel is normally white or normally black.

3. A liquid crystal display controller according to

claim 1

, wherein the switching signal shows whether the liquid crystal panel is a TN liquid crystal panel or a transverse electric field liquid crystal panel.

4. A liquid crystal display controller according to

claim 1

, wherein the switching signal identifies whether a gradation power source is provided for a TN liquid crystal panel or for a transverse electric field liquid crystal panel, depending on the type of liquid crystal panel provided.

5. A liquid crystal display controller according to

claim 1

, wherein the data processor generates a drive signal for a vertical driver and a drive signal for a horizontal driver to be transmitted to the liquid crystal driver when the digital image input signal comprises a pixel signal for RGB and scanning line information.

6. A liquid crystal display comprising;

a liquid crystal panel being either normally white or normally black,

a gradation power source supplying voltage depending on the liquid crystal panel,

a liquid crystal display controller comprising an inverter for inverting a digital image input signal, a selector for choosing and outputting the signal inverted by the inverter and the digital image input signal depending on a switching signal, a data processor for processing data for showing the signal transmitted by the selector on the liquid crystal panel, and

a liquid crystal driver transmitting the digital image input signal data-processed in the liquid crystal display controller to the liquid crystal panel using electric power supplied by the gradation power source.