High-speed and high-precision control proposal and control circuit for LED (light emitting diode) brightness and color

A control circuit and brightness control technology, applied in the fields of LED display, circuit control, and integrated circuits, can solve the problems of complex and unrealizable circuits, and achieve the effects of high speed, reduced difficulty, and high production efficiency

Inactive Publication Date: 2011-04-13
惠州市科信达电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In special places, such as narrow space, due to the complexity of the circuit, it cannot be realized

Method used

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  • High-speed and high-precision control proposal and control circuit for LED (light emitting diode) brightness and color
  • High-speed and high-precision control proposal and control circuit for LED (light emitting diode) brightness and color
  • High-speed and high-precision control proposal and control circuit for LED (light emitting diode) brightness and color

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Embodiment Construction

[0048] The content of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0049] Such as Figure 4 The schematic diagram of driving current linear sweep-output luminous flux is shown. The input is a high-precision linear scanning current, and the output is the luminous flux of the LED, which are measured in RGB respectively, and the measurement data is expressed in a quantified form. Among them, the test curve of R LED can be represented by multi-segment broken lines ArBr, BrCr, CrDr, DrEr, ErFr, FrGr, GrHr, HrIr, etc.; the test curve of G LED can be represented by multi-segment broken lines AgBg, BgCg, CgDg, DgEg, EgFg, FgGg, GgHg , HgIg, etc.; B LED test curves can be represented by multi-segment broken lines AbBb, BbCb, CbDb, DbEb, EbFb, FbGb, GbHb, HbIb, IbJb, JbKb, etc.

[0050] The part with a higher rate of change of the curve is approximated by using more polylines.

[0051] The start of th...

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Abstract

The invention relates to a high-speed and high-precision control proposal and control circuit for LED (light emitting diode) brightness and color as well as an algorithm. The control circuit comprises the following five parts: a single LED scanning and data matrix, a full color and RGB (red-green-blue) corresponding matrix, a brightness control equation, a driving current calibration, multi-line segment approximation and full color display matrix, and an integral circuit proposal. According to the scheme of the invention, various errors in the course of design and creation can be eliminated, and high consistency and high precision of the color and brightness control are achieved. Although the device precision of the used circuit board is 1% or much worse, and various errors exist between the circuit boards, through the implementation of the scheme, the color and brightness errors of each LED and each LED module are 0.1% or more.

Description

technical field [0001] The invention relates to the fields of integrated circuits, LED display and circuit control, in particular to the high-speed, high-precision and high-consistency control of RGB LEDs. Using a general-purpose MCU to control the circuit board, using advanced manufacturing technology, through the algorithm of integrating test and calibration data, and using simple table lookup and addition operations, the purpose of design is achieved. Background technique [0002] The current LED color display scheme considers the luminous efficiency of RGB LEDs to be consistent, or uses packaging equipment to use RGB LEDs with luminous efficiency errors within a certain range as the same LEDs; the drive current error of the drive circuit board is considered It is very small and can be ignored; the combination of driving current and LED is considered to be perfect, and the error will not be enlarged, so that the error of the display can be detected. [0003] The current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/00G09G3/32G01J1/00G01R19/00
Inventor 尹登庆廖启博樊亮
Owner 惠州市科信达电子有限公司
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