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Display control apparatus capable of decreasing the size thereof

A technology of display control and display control method, applied in static indicators, instruments, etc., can solve the problems of reducing the size of the DA converter, reducing the breakdown voltage of the DA converter, reducing the size of the device, etc.

Inactive Publication Date: 2009-07-22
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, the breakdown voltage of the DA converter is lowered, so that if the DA converter is manufactured by a conventional manufacturing method of a low breakdown voltage element, the size of the DA converter can be reduced, thereby reducing the size of the device

Method used

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  • Display control apparatus capable of decreasing the size thereof
  • Display control apparatus capable of decreasing the size thereof
  • Display control apparatus capable of decreasing the size thereof

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Experimental program
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Embodiment Construction

[0024] Before describing the preferred embodiment, a prior art display control device will be explained with reference to FIGS. 1, 2, 3 and 4 (see JP-11-184444A).

[0025] In FIG. 1 , a related art display control device 100 such as an LCD control device is disposed between a controller 200 and a display panel 300 such as an LCD panel.

[0026] The display control device 100 is composed of a gamma voltage generation circuit 101 , a latch circuit 102 , a level shift circuit 103 , a DA converter circuit 104 , and an output buffer circuit 105 .

[0027] The controller 200 operates under a low voltage condition, and the display panel 300 operates under a high voltage condition. Therefore, since the display control device 100 is located between the controller 200 and the display panel 300, the display control device 100 operates under low voltage conditions and high voltage conditions. In more detail, the latch circuit 102 operates under low voltage conditions, while the gamma vol...

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Abstract

In a display control device, a first gamma voltage within a first voltage range is applied to a display panel with reference to two first reference voltages, and a gamma voltage generating circuit is used for generating a second gamma voltage within a second voltage range Horse voltage. The maximum voltage of the second voltage range is lower than the maximum voltage of the first voltage range. at least one digital-to-analog converter for selecting one of the second gamma voltages according to the digital video data signal, and at least one output buffer for boosting the selected one of the second gamma voltages to the first gamma voltage A corresponding gamma voltage of . A corresponding one of the first gamma voltages is applied to the display panel.

Description

technical field [0001] The present invention relates to a display control device for a display panel such as a liquid crystal display (LCD) panel, a plasma display panel, or an inorganic electroluminescent (EL) display panel. Background technique [0002] Generally, a prior art display control device is composed of a gamma voltage generating circuit, a digital-to-analog (DA) converter circuit, and an output buffer circuit, wherein the gamma voltage generating circuit is adapted to generate gamma within a certain voltage range voltage (multi-level voltage), the digital-analog (DA) converter circuit includes a plurality of DA converters each adapted to select one of the gamma voltages according to the display data, the output buffer circuit includes a plurality of output buffers, Each of them is adapted to amplify a selected gamma voltage and apply it to the display panel. Each output buffer is formed of an operational amplifier, a feedback resistor, and a resistor, thereby f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/20
CPCG09G3/3688G09G2330/021G09G2330/028G09G2320/0673G09G2310/0289G09G3/3696
Inventor 加藤文彦
Owner RENESAS ELECTRONICS CORP
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