Method for reducing consumed power for capacitor type touch screen

A capacitive touch screen, power consumption technology, applied in the direction of data processing power supply, mechanical mode conversion, instrument, etc., can solve the problem of unintegrated keyboard and so on

Inactive Publication Date: 2005-03-16
ELAN MICROELECTRONICS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Traditional capacitive touch screens are generally used to provide mouse functions, and can also be designed as handwriting input boards, but they have never integrated functions such as keyboards and handwriting input.

Method used

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  • Method for reducing consumed power for capacitor type touch screen
  • Method for reducing consumed power for capacitor type touch screen
  • Method for reducing consumed power for capacitor type touch screen

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0021] The operation modes of the capacitive touch screen of the present invention include graphic or handwriting input mode, key input mode and periodic sleep mode. figure 2 It is a system block diagram of the capacitive touch screen of the present invention, which includes a panel 10 on which a plurality of pattern symbols 12 corresponding to various keys are arranged, and the scanning lines T0-T33 are distributed in a matrix configuration below the panel 10, and Connected to analog circuit 14 and digital circuit 16 . The digital circuit 16 controls the scanning operation of the scanning lines T0 ˜ T33 , the analog circuit 14 senses the power change caused by the panel 10 being touched, and then the digital circuit 16 calculates and determines the touched position of the panel 10 . The analog and digital circuits 14 and 16 are controlled by a control circuit 18 whose control program includes content from a software program 20 . Any known circuit can be used for the hardwar...

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PUM

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Abstract

The invention relates to a condenser type touch screen, which is composed of many scanning lines matrix type configured on the panel connected to the analogy and digital circuit. The touch screen turns off the analogy circuit after scanning the many scanning lines within a scanning period to decrease the working current under the graphic or the hand-written input mode. The touch screen turns off the analogy circuit after scanning the many scanning lines corresponding to the push-button symbols of the panel within a scanning period to decrease the working current under the push-button input mode. The touch screen turns off the analogy and digital circuit after scanning the many scanning lines within a scanning period to decrease the working current under the periodic sleeping mode. Controlled by the program, the working current is decreased under various modes to reduce the power consumption of the touch screen.

Description

technical field [0001] The invention relates to a scanning method of a capacitive touch screen, in particular to a scanning method for reducing power consumption of the capacitive touch screen. Background technique [0002] Touch screens have been widely used in electronic products. Touch screens provide a simple, light and inexpensive pointing device. There are three types of known touch screens: resistive, electromagnetic and capacitive. Capacitive touch screens are used in public telephones or navigation systems with Internet access, but do not have handwriting input functions. Resistive touch screens are used in, for example, personal digital assistants (PDAs) or electronic dictionaries, but cannot be input by light touch of a finger. Current tablet computers and electronic school bags are equipped with touch screens integrating handwriting recognition and key input functions, which are resistive or electromagnetic touch screens. Resistive touch screens require concen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/32
Inventor 叶仪皓邱延诚简永烈
Owner ELAN MICROELECTRONICS CORPORATION
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