Unlock instant, AI-driven research and patent intelligence for your innovation.

LED drive device and LED drive method

A driving voltage and LED driving technology, which is applied in the field of LED driving devices and can solve problems such as complicated processes

Inactive Publication Date: 2005-11-23
HUNET INC
View PDF1 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to eliminate this difference, methods such as fine-tuning the resistance value corresponding to each LED have been used in the past, but the problem with the above-mentioned operation is that the process is very complicated

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
  • LED drive device and LED drive method
  • LED drive device and LED drive method
  • LED drive device and LED drive method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0028] exist figure 1 , 10 represents the LED driving device according to Embodiment 1 of the present invention as a whole. The LED driving device 10 is provided in a liquid crystal display device, and is used to drive three-color LEDs of R, G and B disposed on the back of the liquid crystal panel. And as a specific example, this embodiment will illustrate the application of the present invention to a field sequential liquid crystal display device.

[0029] The LED drive device 10 has an applied voltage storage register 11 for R (red), an applied voltage storage register 12 for G (green), and an applied voltage storage register 13 for B (blue). The registers 11, 12, and 13 above store the voltage values ​​applied to the R, G, and B LEDs, respectively. Each register 11, 12, 13 is connected to the bus 14 for setting the stored value, and when the product of the LED drive device 10 goes off the production line, the bus 14 for setting the stored value makes each register 11, 12,...

Embodiment approach 2

[0078] Figure 8 Showing the structure of the LED driving device 50 according to the second embodiment of the present invention, in Figure 8 neutralize figure 1 Corresponding parts are marked with the same reference numerals. The structure of the LED driving device 50 is the same as that of the LED driving device 10 in Embodiment 1 except for the LED connection method in the LED unit 51 .

[0079] In this embodiment, the red LEDs among the red, green and blue LEDs are connected in series. Accordingly, the number of power supply systems for the red LED can be reduced, thereby reducing the current consumption required for the red LED to emit light.

[0080] That is, the present embodiment focuses on the fact that the driving voltage required to make the red LEDs emit light with the desired luminance is almost half of that required to make the green and blue LEDs emit light with the desired luminance.

[0081] From this, it is conceived that two red LEDs connected in series ...

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

PROBLEM TO BE SOLVED: To provide a driver and a driving method of an LED in which current consumption can be reduced effectively while absorbing variation in the characteristics of respective LEDs. ŽSOLUTION: Driving voltages of respective color LEDs are stored in applying voltage storage registers 11, 12 and 13 and each color LED is driven with an independent driving voltage thus reducing current consumption. Data in the applying voltage storage registers 11, 12 and 13 can be rewritten through a storage value setting bus 14 and when the minimum light emitting voltage varies due to individual difference of an LED being mounted actually, voltages being stored in the applying voltage storage registers 11, 12 and 13 can be altered appropriately. Ž

Description

technical field [0001] The present invention particularly relates to an LED driving device and an LED driving method for making R, G, and B three primary color LEDs (Light Emitting Diodes, light emitting diodes) emit light to display colors. Background technique [0002] In the past, in liquid crystal display devices using R (red), G (green), and B (blue) LEDs in three primary colors, for example, the field sequential method (abbreviated as FS method) published in JP-A-2000-241811 has been realized. Liquid crystal display device. In the FS type liquid crystal display device, three-color LEDs are arranged on the back of the liquid crystal shutters, and the liquid crystal shutters at each pixel position are simultaneously turned on and off while the LEDs of each color are sequentially lit at high speed, so that desired colors can be displayed at each pixel position. [0003] For example, to display red, the liquid crystal shutter is opened while the red LED is emitting light,...

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
IPC IPC(8): G02F1/133G09G3/20G09G3/34G09G3/36H01L33/00
Inventor 尾崎丰
Owner HUNET INC