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Lighting circuit and portable paperless book using this lighting circuit

A lighting circuit and portable technology, applied in lighting devices, electric lamp circuit layout, electric light source, etc., can solve the problems of inability to control the backlight, inability to read, etc., and achieve the effect of avoiding power waste and facilitating users

Inactive Publication Date: 2007-11-28
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, a lighting circuit is provided to solve the problem that the electronic device cannot control the backlight in the prior art
[0005] Also provided is a portable paperless book with the above-mentioned lighting circuit to solve the problem in the prior art that the portable paperless book cannot be read without external lighting

Method used

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  • Lighting circuit and portable paperless book using this lighting circuit
  • Lighting circuit and portable paperless book using this lighting circuit
  • Lighting circuit and portable paperless book using this lighting circuit

Examples

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Embodiment Construction

[0020] Please refer to FIG. 1 , which is a schematic diagram of an electronic device using the lighting circuit of the present invention. The electronic device shown is a portable paperless book 1 . The portable paperless book 1 includes a display area 11 and a key area 12 . A plurality of light emitters 14 are installed inside the shell of the surrounding area 13 of the display area 11 . The illuminant 14 emits bright light to illuminate the display area 11 through a light guide plate (not shown). The user can still read the information displayed in the portable paperless book 1 in a dark environment.

[0021] Please refer to FIG. 2 and FIG. 3 , which are circuit block diagrams and partial switch connection schematic diagrams of a specific embodiment of the lighting circuit of the present invention. The light emitting unit 7 including the illuminant 14 utilizes a control unit 3 to generate a pulse width modulated wave (PWM wave) to control the light emitting brightness. B...

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PUM

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Abstract

This invention relates to an illumination circuit including a light emission unit including multiple parallel luminescent branches, the brightness of which is controlled by a control unit outputting pulse-width modulation wave to control the on-off of a switch circuit, said pulse-width modulation wave is generated by the control unit based on sensing strength of environmental light by a sensing unit to get the aim of automatically controlling luminescent brightness of a luminescent unit.

Description

technical field [0001] The invention relates to a lighting circuit, in particular to a lighting circuit applied to a portable paperless book. Background technique [0002] When the electronic device uses the LED light to illuminate the display device to display information to the user, the LED light will light up regardless of the light intensity, and illuminate the display screen so that the user can read the displayed information. Therefore, even in a strong light environment, when the user can clearly read the information without the illumination provided by the LED lamp, since the LED cannot be automatically or manually controlled by the user, it will still light up, thereby consuming excess power. [0003] The emergence of portable paperless books is a great progress in the energy saving of electronic products. Because it uses electronic ink to display text and pictures, it does not need a backlight source, thus saving a lot of power. However, because the portable pape...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCG09G3/3406G09G3/3433G09G2360/144
Inventor 穆绪臣钟新鸿王汉哲谢冠宏
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD