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Low power LCD with gray shade driving scheme

A grey, shaded technology used in static indicators, instruments, etc., to solve problems such as unsatisfactory LCD drive solutions

Inactive Publication Date: 2005-08-10
JPS GRP HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] None of the above LCD driving schemes are fully satisfactory

Method used

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  • Low power LCD with gray shade driving scheme
  • Low power LCD with gray shade driving scheme
  • Low power LCD with gray shade driving scheme

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: 4-Shadow Modulation

[0039] 3 frames per group:

[0040] Frame 1: 2t / row

[0041] Frame 2: 1t / row

[0042] Frame 3: 2t / row

[0043] (repeat frames 1-2-3)

[0044] Then, use the following combination to produce 4 shades

[0045] Shading 0 / 5 = all off

[0046] shadow 2 / 5 = frame 1

[0047] shadow 3 / 5 = frame 1+2

[0048] Shadow 5 / 5 = frame 1+2+3

Embodiment 2

[0049] Example 2: 8-Shadow Modulation

[0050] 3 frames per group:

[0051] Frame 1: 2t / row

[0052] Frame 2: 3t / row

[0053] Frame 3: 4t / line

[0054] (repeat frames 1-2-3)

[0055] Then, use the following combination to generate 8 shades

[0056] Shades 0 / 9 = all off

[0057] shadow 2 / 9 = frame 1

[0058] shadow 3 / 9 = frame 2

[0059] shadow 4 / 9 = frame 3

[0060] Shadow 5 / 9 = Frame 1+2

[0061] Shadow 6 / 9 = Frame 1+3

[0062] Shadow 7 / 9 = Frame 2+3

[0063] Shadow 9 / 9 = Frame 1+2+3

Embodiment 3

[0064] Example 3: 15-Shadow Modulation

[0065] 4 frames per group:

[0066] Frame 1: 3t / row

[0067] Frame 2: 4t / line

[0068] Frame 3: 5t / row

[0069] Frame 4: 6t / row

[0070] (repeat frames 1-2-3-4)

[0071] Then, 15 shades can be generated using the combination below

[0072] Shades 0 / 18 = all off

[0073] shadow 3 / 18 = frame 1

[0074] shadow 4 / 18 = frame 2

[0075] shadow 5 / 18 = frame 3

[0076] shadow 6 / 18 = frame 4

[0077] Shadow 7 / 18 = Frame 1+2

[0078] Shadow 8 / 18 = Frame 1+3

[0079] Shadow 9 / 18 = frame 2+3

[0080] Shadow 10 / 18 = frame 2+4

[0081] Shadow 11 / 18 = frame 3+4

[0082] Shadow 12 / 18 = frame 1+2+3

[0083] Shadow 13 / 18 = frame 1+2+4

[0084] Shadow 14 / 18 = frame 1+3+4

[0085] Shadow 15 / 18 = frame 2+3+4

[0086] Shadow 18 / 18 = frame 1+2+3+4

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Abstract

In a passive liquid crystal display, frames or fields are displayed for different time periods to achieve gray scale. The voltage pulses applied to the column electrodes have substantially constant values during row scanning periods or field scanning periods to reduce power consumption. The lines of the display may be divided into odd and even fields in an interlaced configuration to suppress flicker and to further reduce power consumption by reducing frame rate.

Description

technical field [0001] The present invention generally relates to systems for displaying information on liquid crystal displays (LCDs), and more particularly, the present invention relates to low power LCDs employing a gray shades driving scheme. Background technique [0002] Liquid crystal displays are used in a variety of devices such as cellular telephones, pagers, and personal digital assistant devices. Since many of these displays are used in portable, battery-operated devices, low power consumption is an important display characteristic. Many prior art systems, such as LCD displays, include circuitry that delivers power to the display through row and column electrodes, the overlapping regions of which constitute pixels. The information to be displayed is transformed into row addressing signals and column data signals according to one of various techniques. These techniques work within the physical constraints and specifications of LCD materials by providing appropria...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G09G3/20G09G3/36
CPCG09G3/2029G09G2310/0267G09G2330/021G09G2310/0205G09G2310/0213G09G2330/023G09G2320/0276G09G2310/02G09G3/3622G09G3/36
Inventor 梁振宇萧宏阮世欣
Owner JPS GRP HLDG