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Energy efficient grey scale driver for electroluminescent displays

A display and energy technology, applied in the direction of static indicators, instruments, etc., can solve problems such as no suggested resonant circuit or gray scale control

Inactive Publication Date: 2005-04-27
IFIRE IP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no resonant circuit or gray scale control is suggested

Method used

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  • Energy efficient grey scale driver for electroluminescent displays
  • Energy efficient grey scale driver for electroluminescent displays
  • Energy efficient grey scale driver for electroluminescent displays

Examples

Experimental program
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Embodiment Construction

[0043] According to the broadest aspect of the invention, the secondary winding of the step-down transformer T shown in Figure 4 is connected to a full wave rectifier with a bulk storage capacitor connected across its output. storage capacitor C s and display board capacitor C p in series, such as Image 6 shown. connected to the full-wave rectifier and storage capacitor C s The turns ratio of the secondary winding connected to the display panel is at least 1.05:1, preferably at least 1.1:1, and more preferably in the range of 1.1:1 to 1.2:1. The turns ratio of the secondary winding of the present invention is significantly greater than that of the 3-turn secondary winding connected to the display panel in the energy recovery circuit shown in FIG. 4 (ie, the turns ratio of US Patent Application 09 / 504,472). The 3-turn winding in this circuit is used to provide a small DC offset to the voltage input to the row driver and column driver to ensure their proper operation. and ...

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PUM

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Abstract

The driving circuit incorporates a resonant circuit that is able to efficiently recover capacitative energy stored on the row of pixels and transfer it to another row of pixels as the rows are addressed. The resonant circuit comprises a step down transformer, a capacitator across the priminary winding, either the rows or columns of the display panel connected acorss the secondary winding and an input voltage and FET switches to drive the resonant circuit synchronous with the timing pulses governing the addressing of the display. The improvement of the present invention is an additional secondary winding that is connected to a rectifier and DC storage capacitor that is connected in series with the rows of columns of the panel. The additional circuit facilitates clamping of the driver voltage to a constant level irrespective of variations in the load due to the fluctuations in load impedance.

Description

technical field [0001] The present invention relates generally to a flat panel display, and more particularly to a resonant switching display panel drive circuit in which the display panel imposes a variable high capacitive load on the drive circuit and must be adjusted to facilitate gray scale control. driving voltage. Description of drawings [0002] The background technology and the specific embodiment of the present invention will be described below with reference to the accompanying drawings, and the accompanying drawings include: [0003] Fig. 1 is a plan view according to the arrangement of each row of pixels and each row of pixels on an electroluminescence display of the prior art; [0004] Figure 2 is a cross-sectional view through a pixel of the electroluminescent display shown in Figure 1; [0005] image 3 is the equivalent circuit of the pixel shown in Figure 2; [0006] Figure 4 is a simplified circuit schematic diagram of a resonant circuit used in a displa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G3/30
CPCG09G3/30G09G2330/023G09G3/20
Inventor 郑振辉
Owner IFIRE IP CORP