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Liquid crystal display device with reduced power consumption in standby mode

A technology of liquid crystal display and standby mode, applied in static indicators, instruments, nonlinear optics, etc., can solve problems such as difficult to read information, and achieve an easy-to-read effect

Inactive Publication Date: 2006-02-01
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in all previous solutions, the viewing characteristics of the LCD, most notably the contrast ratio, are unacceptably low when the driving device is in standby mode.
This has the consequence that it is difficult for the user to read the information displayed on the LCD in standby mode

Method used

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  • Liquid crystal display device with reduced power consumption in standby mode
  • Liquid crystal display device with reduced power consumption in standby mode
  • Liquid crystal display device with reduced power consumption in standby mode

Examples

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Embodiment Construction

[0038] The liquid crystal device comprises a liquid crystal (LC) cell provided with an active layer 130 of liquid crystal material, figure 1 A pixel of the cell is represented in . A liquid crystal (LC) layer 130 is sandwiched between two glass plates and includes an upper electrode 122 and a lower electrode 124 . The LC layer 130 is capable of modulating characteristics of light passing therethrough. By applying a voltage difference across the electrodes 122, 124, an electric field is generated across the LC layer 130, and the modulation of light through this layer changes.

[0039] The electric field is applied pixelwise, that is, the liquid crystal display includes a plurality of pixels arranged in rows and columns, and a driving voltage is generated for each pixel separately. For this purpose, the drive means 110 comprise a row driver 112 and a column driver 114 .

[0040]If the LCD is an active matrix type, each pixel includes a thin film transistor (TFT) 120 . The ga...

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PUM

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Abstract

A reflective or transflective Liquid Crystal Display (LCD) device (100) is provided with driving means (110) operable in at least two modes, namely an active mode and a power saving standby mode. According to the invention, the (LCD) is of the normally black type, wherein a minimum driving voltage corresponds to the dark state and a maximum driving voltage corresponds to the bright state. Because of this, in the standby mode the maximum driving voltage may be altered, thereby affecting the bright state. Thus, the contrast ratio of the (LCD) remains relatively high in the standby mode. Preferably, the (LCD) comprises a layer (130) of a vertically aligned liquid crystal material.

Description

technical field [0001] The invention relates to a liquid crystal display device. Background technique [0002] Liquid crystal displays (LCDs) are increasingly used in handheld devices such as PDAs, mobile phones, and the like. For these mobile applications, LCDs have become the de facto standard display device due to low power consumption, reliability and low price. [0003] The operation of an LCD is based on the modulation of light in a liquid crystal (LC) cell comprising an active layer of liquid crystal material. By applying an electric field, the light modulation of the liquid crystal layer is changed to change the characteristics of light passing through the LC layer. [0004] Liquid crystal displays generally include a plurality of picture elements (pixels) arranged in rows and columns. Each pixel of the display can be addressed individually, for which reason the drive means for driving the LC cells usually comprise a separate pixel driver for each picture element ...

Claims

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Application Information

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IPC IPC(8): G09G3/36G09G3/20
CPCG09G3/3648G09G2320/066G09G3/2014G09G2320/02G09G3/3611G09G2300/0456G09G2320/0606G02F1/133G09G3/36
Inventor S·J·鲁森达亚
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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