Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Light control circuit

A dimming circuit, drive control circuit technology, applied in the direction of lamp circuit layout, light source, electric light source, etc., can solve the problem of no dimming device, etc., to achieve the effect of easy dimming and excellent effect

Inactive Publication Date: 2008-03-26
ALPS ALPINE CO LTD
View PDF2 Cites 54 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, there has been no dimming device that can appropriately adjust the light emission amount corresponding to the two

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Light control circuit
  • Light control circuit
  • Light control circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] Next, embodiments of the dimming circuit involved in the present invention will be described with reference to FIGS. 1 to 4 .

[0031] FIG. 1 shows a circuit configuration of an embodiment of the present invention. The dimming circuit of the present embodiment is suitable for dimming a lighting device of a liquid crystal device equipped with a reflective type or a transflective LCD that emphasizes reflection.

[0032] The dimming circuit 1 of the present embodiment has: a light-emitting element 2, a plurality of LEDs 2a connected in series with the function of the luminous body of the lighting device (not marked in the figure); an illuminance sensor 3, which detects the illuminance of the ambient light of the lighting device; and driving The control circuit 4 adjusts the amount of light emitted by the light emitting element 2 to emit light according to the illuminance detected by the illuminance sensor 3 . The anode of the LED 2a of the light-emitting element 2 is conn...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a dimming circuit, which can adjust the luminous amount in analogy corresponding to the change of the surrounding illuminance, and can control the dimming very smoothly. In this dimming circuit, the illuminance sensor (3) is formed as a current output type that outputs a current that increases or decreases in analogy corresponding to the increase or decrease of illuminance, and the light-emitting element (2) and the sensor that detects the current flowing into the light-emitting element (2) The detection resistor (5) is connected, and the drive control circuit (4) has a light-emitting element driver (7) that outputs a voltage to the light-emitting element (2) such that the current flowing through the light-emitting element 2 flows into the detection resistor (5) and The voltage obtained by the current detected by the illuminance sensor (3) is always maintained at a specified value, and the light emitting element (2) emits bright light in a dark place detected by the illuminance, and dark light in a bright place.

Description

technical field [0001] The invention relates to a dimming circuit, and the related dimming circuit is particularly suitable for adjusting the brightness of an illuminating device for illuminating liquid crystal equipment. Background technique [0002] Generally, a liquid crystal device used as an image display unit of a mobile phone or the like is provided with an illuminating device for illuminating the liquid crystal device, and also adjusts the brightness of the screen according to the ambient light. [0003] Various proposals have been made as a dimming device for adjusting brightness as described above. (For example, refer to Patent Document 1 and Patent Document 2) [0004] A conventional dimming device as shown in Patent Document 1 has, for example, the configuration of FIG. 5 . In FIG. 5 , the illuminance level detected by an illuminance sensor 21 composed of a phototransistor or the like changes in voltage through a resistor 22 for current-voltage conversion, and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCH05B33/0851H05B45/12H05B47/11Y02B20/40
Inventor 渡边实鹿野满藤原实
Owner ALPS ALPINE CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com