Light-emitting diode (LED) display screen constant-current driving circuit with plurality of mirror image ratios

A LED display, constant current drive technology, applied in the direction of static indicators, instruments, etc., can solve the problems affecting the display quality of full-color LED display, increase the power supply voltage, and difficult to establish, so as to improve the driving current constant current Accuracy, improved performance, improved display quality effects

Inactive Publication Date: 2013-06-12
HEFEI UNIV OF TECH +1
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the brightness of a light-emitting diode is determined by the current that drives it, the value of M will be restricted by the constant current accuracy of the drive current and the current consistency between different current drive channels, so it is difficult to establish a very accurate more The system of gray level and brightness contrast relationship, which in turn affects the display quality of the entire full-color LED display
[0005] In addition, in order to improve the overall brightness of the LED display and adapt to the environment with strong light, some LED displays will be designed and produced by stringing several LEDs together to increase the brightness, but such a solution will increase the power supply voltage of the entire system At the same time, it is also required that the output drive channel port of the LED drive circuit has the characteristics that the withstand voltage can be improved
In order to make the output drive channel port of the LED drive circuit have the characteristics of improved withstand voltage, the main solution is to use a higher withstand voltage processing technology or use a withstand voltage drive tube for each data output port to drive the LED. string, but both options will increase the cost of the overall system

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-emitting diode (LED) display screen constant-current driving circuit with plurality of mirror image ratios
  • Light-emitting diode (LED) display screen constant-current driving circuit with plurality of mirror image ratios
  • Light-emitting diode (LED) display screen constant-current driving circuit with plurality of mirror image ratios

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] see Figure 1 to Figure 6 , LED display constant current drive circuit with multiple mirror ratios, including reference voltage source circuit, constant current regulation circuit, voltage sampling circuit, current mirror ratio self-adjusting circuit, first-stage current mirror with adjustable mirror ratio, mirror ratio Adjustable second-stage current mirror group and display frame data processing circuit; the reference voltage source circuit is respectively connected with the constant current regulation circuit and the voltage sampling circuit for generating the reference voltage U 0 , and set the reference voltage U 0 input to the constant current regulation circuit and the voltage sampling circuit respectively; the constant current regulation circuit is connected with the first-stage current mirror, and is used to generate the reference voltage U according to the reference voltage source circuit 0 , generating a constant current I 0 , and the constant current I 0 ...

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 discloses a light-emitting diode (LED) display screen constant-current driving circuit with a plurality of mirror image ratios. The driving circuit comprises a reference voltage source circuit, a constant-current regulation circuit, a voltage sampling circuit, a current mirror image ratio self-regulation circuit, a current mirror circuit and a display frame data processing circuit. The reference voltage source circuit comprises a seven-stage ring oscillator and a band-gap reference circuit. The constant-current regulation circuit comprises a comparator, a current biasing tube and an external grounding resistor. The current mirror circuit comprises a plurality of current mirror image tubes. The display frame data processing circuit comprises a plurality of display frame data processing units. An output driving channel port of the circuit is provided with a voltage-resistant circuit comprising two N-channel metal oxide semiconductor (NMOS) tubes. A first-stage current mirror group comprises a plurality of current mirror image tubes. A second-stage current mirror group comprises a plurality of current mirror image tubes. The driving circuit has a plurality of mirror image ratios, and has the advantages that gray levels of an LED display screen can be regulated and added, the brightness contrast of the LED display screen can be improved, the problem of voltage resistance of the output driving channel port is solved with lower cost, and the like.

Description

[0001] This application is a divisional application with the application number 201110301641.7, the application date is September 28, 2011, and the invention title is "Constant Current Drive Circuit for LED Display with Optional Mirror Ratio". technical field [0002] The invention relates to a driving circuit, in particular to a LED display constant current driving circuit with various mirror ratios. Background technique [0003] Light-emitting diode is a current control device, which has the advantages of high brightness, small size, low power consumption, good monochromaticity, fast response speed, and long service life. Large, medium and small LED displays are composed of light-emitting diode arrays, which can be used to display various information such as text, graphics, images, animations, market prices, videos, etc., and light-emitting diodes with three primary colors of red, green and blue The full-color LED display screen composed of it can display delicate color im...

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): G09G3/32
Inventor 王晓蕾郑皓蒋飞飞
Owner HEFEI UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products