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Liquid crystal driving device

A technology of liquid crystal drive and liquid crystal drive circuit, which is applied in the direction of control devices, transportation and packaging, mechanism layout/installation, etc., which can solve the problems that cannot be solved such as the decrease of the contrast of the liquid crystal display screen, and achieve the effect of alleviating the decrease of the contrast

Inactive Publication Date: 2009-11-25
RENESAS ELECTRONICS CORP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, since the detection value of the temperature sensor is not used by the contrast enhancement process, it cannot solve the problem of the decrease in the contrast of the liquid crystal display screen caused by the decrease in the driving current of the LED as the light source of the backlight at high temperature. The research results of the present inventors etc. have been confirmed

Method used

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Embodiment Construction

[0091] "Representative Implementation Mode"

[0092] First, representative embodiments of the invention disclosed in this application will be described in outline. Parentheses are added to the summary description representing the embodiment, and the reference numerals in the referred drawings are merely illustrations of members included in the concept of the constituent element to which the numerals are attached.

[0093] [1] A liquid crystal drive device (101) according to a representative embodiment of the present invention includes a liquid crystal drive circuit (108), backlight control units (104, 205), and display data stretch processing circuits (206, 207).

[0094] The liquid crystal drive circuit (108) generates a liquid crystal drive signal (110) to be supplied to a liquid crystal display panel (114) based on data to be displayed (209).

[0095] The backlight control unit (104, 205) operates to reduce a driving current of a light emitting diode that illuminates a lig...

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Abstract

A liquid crystal driving device is provided, which can reduce the problem of contrast lowering of the liquid crystal display screen due to the decrease of the driving current of LED, by the control which is performed in order to cope with the decrease of the maximum rated current of LED as a light source of the backlight at a high temperature. The liquid crystal driving device includes a liquid crystal driving circuit, a backlight control unit, and display data expansion circuits. The liquid crystal driving circuit generates a liquid crystal driving signal to be supplied to a liquid crystal display panel in response to display data. The backlight control unit reduces driving current of the light emitting diode as a light source of the backlight module to illuminate the liquid crystal display panel, in response to the temperature rise of the liquid crystal display panel. The display data expansion circuit, in response to the temperature rise of the liquid crystal display panel, performs the data expansion of the display data, and compensates the contrast lowering of the liquid crystal display panel due to the dimming of the backlight module with the temperature rise of the liquid crystal display panel.

Description

technical field [0001] The present invention relates to backlight control of a liquid crystal driving device, in particular to a technique beneficial to solving the problem of reduced contrast of a liquid crystal display screen caused by a decrease in driving current of an LED used as a light source of a backlight at high temperature. Background technique [0002] In recent years, small-sized and lightweight liquid crystal displays are mounted on battery-operated information devices, mobile phones, and the like. Almost all of these LCDs are transmissive or semi-transmissive LCDs that require a backlight. [0003] In the backlight of these displays, white LEDs are used for the reasons of low power consumption, long service life, and easy realization of size and weight. As the most common structure of white LED, the product adopts a structure that combines a semiconductor light emitting diode (LED: Light Emitting Diode) that emits blue light and a phosphor that emits yellow l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20G09G5/02
CPCG09G2360/145G09G3/2092G09G2320/041G09G3/3413G09G5/363B60K2350/302G09G2320/0238G09G2320/064B60K2350/203G09G2320/0673G09G3/3406G09G2320/0646B60K2360/33B60K2360/42
Inventor 黑川能毅片山由佳利工藤泰幸赤井亮仁新田博幸本间和树
Owner RENESAS ELECTRONICS CORP
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