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LED current ramping method for optical mouse

一种发光二级管、光学鼠标的技术，应用在光学鼠标领域，能够解决增加光学鼠标功率损耗等问题

Active Publication Date: 2018-06-29
PIXART IMAGING PENANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above problems (blurring, pre-flash) are not significant in low-speed operation mode, so when the LED current is kept at a high level, it will greatly increase the power consumption of the optical mouse

Method used

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  • LED current ramping method for optical mouse
  • LED current ramping method for optical mouse
  • LED current ramping method for optical mouse

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Embodiment Construction

[0016] It is an object of the present invention to provide a speed-controlled LED setting that will increase or decrease the LED current for the optical mouse sensor in real time.

[0017] See figure 1 , figure 1 is a schematic diagram of an optical mouse sensor 100 according to an embodiment of the present invention. figure 1 The right part is the main functional components of the optical mouse sensor 100 , and the left part is the circuit structure of the constant current LED driver 130 in the optical mouse sensor 100 . The optical mouse sensor 100 includes a pixel and an analog front end circuit (pixel and analog front end circuit) 120, wherein the pixel and analog front end circuit 120 includes an amplifier and an analog-to-digital converter (analog-to-digital, ADC) circuit (not shown in FIG. in the figure). In addition, the optical mouse sensor 100 further includes a constant current LED driver 130 , an oscillator 140 and a digital circuit 150 . The digital circuit 15...

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Abstract

An LED current ramping method for an optical mouse includes: determining a speed of the optical mouse; setting control bits according to the determined speed; sending the control bits to a digital circuit of the mouse; and decoding the control bits to selectively open and close switches in a constant current LED driver of the mouse to adjust a current according to the speed.

Description

technical field [0001] The present invention relates to an optical mouse, in particular to a current ramping method (current ramping method) for controlling a light emitting diode (LED) of the optical mouse. Background technique [0002] With the conventional optical mouse, the current system of the LED of the optical mouse is set to keep constant at all speeds, but in the high-speed operation mode, it is necessary to increase the current of the LED to reduce image blurring (image blurring) and reduce And pre-flash (pre-flash) time, in order to meet the above requirements, the conventional optical mouse must keep the current of the LED at a high level. [0003] However, the above-mentioned problems (image blur, pre-flash) are not significant in low-speed operation mode, so when the LED current is kept at a high level, the power consumption of the optical mouse will be greatly increased. Contents of the invention [0004] In view of this, the object of the present inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/038G06F3/0354
CPCG06F3/03543G06F3/0383G06F1/3259G06F3/0317Y02D10/00G09G3/32G09G2310/066
Inventor 彭桂莉
Owner PIXART IMAGING PENANG