Method for realizing gray scale controllability of LED (Light-Emitting Diode) constant-current driver and constant-current driver

A technology of constant current driver and gray level, applied in the field of level control, can solve the problems of low transmission of useful data, cumbersome control, and data signal without weight
CN102708803AActive Publication Date: 2012-10-03CHONGQING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING UNIV OF POSTS & TELECOMM
Publication Date
2012-10-03

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Abstract

The invention discloses a method for realizing gray scale controllability of an LED (Light-Emitting Diode) constant-current driver. The method comprises the following steps of: according to a needed gray scale, controlling digits for storing data of data registers; when m gray scales (m(n) are needed, storing the data by the m data registers; resetting and zeroing to enable the data stored in residual (n-m) data registers to be zero so as to obtain the data type of the gray scale; and transmitting the data to a counting comparison module in parallel by the n data registers to generate a corresponding duty ratio signal driving output. According to the invention, the defects in the prior art are overcome; an LED driver is applicable to random display of 1-16-bit gray scales and a shifting register does not need to be fully filled; a chip can sufficiently utilize a clock frequency so that the requirements of the chip on the clock frequency are reduced; the cascading working capability of the chip of the driver is stronger; and furthermore, the invention further discloses the LED constant-current driver capable of realizing the gray scale controllability.
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Description

technical field

[0001] The invention relates to a method for realizing controllable gray levels of LED constant current drivers. Specifically, this design is based on shift registers, D flip-flops, counters and comparators to realize LED driving functions, and at the same time has gray levels that can be controlled. control function. Background technique

[0002] The LED display screen is an important part of the LED field. Since the birth of the full-color LED display screen, it has maintained a rapid development trend. The full-color high-brightness LED large-screen display screen has been widely used in finance, securities, transportation, airports, railways, stadiums, Various fields such as commercial advertisement and post and telecommunications. The biggest feature of LED display is that its manufacturing is not limited by area, it can reach tens or even hundreds of square meters, and it is widely used in various indoor and outdoor occasions to display text, graphics,...

Claims

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