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Electronic device based on electrowetting effect

A technology of electronic devices and display devices, applied in optics, lenses, instruments, etc., can solve problems such as inability to give repeatable results

Inactive Publication Date: 2009-08-19
三星LCD荷兰研究开发中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this means that there is no control over the electric field in the electrode-free region, and it has been shown by simulations that this approach does not give reproducible results

Method used

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  • Electronic device based on electrowetting effect
  • Electronic device based on electrowetting effect
  • Electronic device based on electrowetting effect

Examples

Experimental program
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Embodiment Construction

[0058] The present invention relates to an electronic device comprising an array of electrowetting cells, wherein each cell has a first electrode and a second electrode to which the same cell drive voltage is applied simultaneously using different switching devices. The use of two switching devices enables the final signal applied to each electrode to be different due to different capacitive effects.

[0059] To understand the present invention, a discussion of pixel circuit behavior is first provided.

[0060] As described above, modulation of the voltage between the pixel conductor and the common electrode conductor adjusts the light transmissive state of the cell. this is in image 3 is schematically shown in , which shows that the turn-on of the cell is typically affected by hysteresis.

[0061] In order to place a transmitted grayscale value on a cell, the cell must first be fully switched on and then switched off to a specific transmission value. Alternatively the uni...

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PUM

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Abstract

An electronic device comprises an array of electro wetting cells, each cell comprising first and second liquids (14,18) which are immiscible in each other. An electrode arrangement (60a,60b) is used to control the position of the interface between the first and second liquids, and comprises a first electrode and a second electrode. Each cell comprises a first switching device (64a) for applying a cell drive voltage to the first electrode (60a), and a second switching device (64b) for simultaneously applying the same cell drive voltage to the second electrode (60b). The cell circuit can be produced without requiring any additional control lines to those required for a single electrode and associated switching device, but the use of two switching devices enables the ultimate signal applied to each electrode to be different as a result of different capacitive effects. This then enables control over the way the liquid interface moves in response to control voltages.

Description

technical field [0001] The invention relates to an electronic device utilizing the electrowetting effect. This involves the electrical control of electrostatic forces to provide control over the optical properties of the fluid. Display devices and controllable lenses utilizing the electrowetting effect have been proposed. Background technique [0002] Known electrowetting display devices comprise an array of cells, each cell filled with a layer of colored oil. figure 1 One unit 10 is shown in cross section (top image) and in plan view (bottom image). Each cell 10 forms a pixel in the display and is separated from its neighbors by a cell wall 12 of colored oil 14 that bounds the cell. [0003] The cell walls are in the form of a grid attached to a hydrophobic insulating layer 16 forming the base of the cell. Above the units is a layer of conductive water 18 which is common to all units. Electrical contact to the conductive water is made through a transparent common elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B26/02
CPCG09G2300/023G09G2310/06G09G3/2011G09G3/3433G09G2300/08G02B26/004G02B3/14G02B26/02
Inventor P·D·费尔利S·C·迪恩C·格拉斯
Owner 三星LCD荷兰研究开发中心
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