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Flashlight brightness control circuit and portable terminal

A portable terminal and brightness control technology, which is applied in the direction of electric lamp circuit layout, optics, light source, etc., can solve problems such as overexposure and non-adjustable flash brightness

Inactive Publication Date: 2014-12-03
SHENZHEN FUTAIHONG PRECISION IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the brightness of most flashes cannot be adjusted, resulting in overexposure when taking close-up photos, especially macro shots

Method used

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  • Flashlight brightness control circuit and portable terminal

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Experimental program
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Effect test

Embodiment Construction

[0012] see figure 1 , a preferred embodiment of the present invention provides a flash light brightness control circuit 100, which can be applied to portable terminals 200 such as mobile phones, tablet computers, personal digital assistants (Personal Digital Assistant, PDA), digital cameras, etc. The brightness of a flash LED of the portable terminal 200 .

[0013] The flash light brightness control circuit 100 includes a pulse generating unit 10 , a resistance value adjustment circuit 30 and a flash light driving chip 50 .

[0014] The pulse generating unit 10 is used for triggering a pulse signal according to the photographing distance of the portable terminal 200 . Specifically, when it is necessary to take pictures at a short distance or a macro distance (for example, less than 30cm), the pulse generating unit 10 triggers a low-level pulse signal; Pulse signal.

[0015] The pulse generation unit 10 can be the central processing unit (CPU) of the portable terminal 200, w...

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PUM

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Abstract

The invention provides a flashlight brightness control circuit and a portable terminal. The portable terminal includes a flashlight, the flashlight brightness control circuit includes a pulse generation unit, a resistance value adjusting circuit and a flashlight driving chip, wherein the pulse generation unit is used for triggering a pulse signal according to a photographing scene, the resistance value adjusting circuit is electrically connected with the pulse generation unit and used for adjusting the resistance value of the resistance value adjusting circuit under control of the pulse signal, and the flashlight driving chip is electrically connected between the resistance value adjusting circuit and the flashlight and used for controlling the brightness of the flashlight according to the resistance value of the resistance value adjusting circuit. The flashlight brightness control circuit can effectively prevent overexposure in microspur photographing.

Description

technical field [0001] The invention relates to a flashlight brightness control circuit, in particular to a flashlight brightness control circuit applied to a portable terminal. Background technique [0002] With the improvement of camera performance of portable terminals such as mobile phones and tablet computers, a flashlight has gradually become a standard configuration of portable terminals. However, at present, the brightness of most flashes cannot be adjusted, resulting in overexposure when taking close-up photos, especially macro shots. Contents of the invention [0003] In view of this, it is necessary to provide a flash light brightness control circuit that can prevent overexposure when taking macro photos. [0004] In addition, it is also necessary to provide a portable terminal with the brightness control circuit of the flashlight. [0005] A flashlight brightness control circuit, which is used to control the brightness of a flashlight of a portable terminal, ...

Claims

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Application Information

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IPC IPC(8): H05B37/02G03B15/05
Inventor 张阳
Owner SHENZHEN FUTAIHONG PRECISION IND CO LTD