Digital-analogue converter, drive device of display and image data conversion method

A technology of image data and driving devices, applied to static indicators, instruments, etc., can solve problems such as image flickering, image signal distortion, insufficient image update rate, etc., to achieve the effect of avoiding waveform distortion and improving update rate

Active Publication Date: 2011-07-20
MY SEMI
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  • Abstract
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Problems solved by technology

However, due to the problem of insufficient image update rate in the existing PWM signal, this will cause image flickering
In order to overcome the phenomenon of screen flicker, the existing technology disperses the duty cycle corresponding to the gray scale of the image to reduce the harmonic signal energy within the visible range of the human eye, but excessive dispersion processing will cause image signal distortion

Method used

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  • Digital-analogue converter, drive device of display and image data conversion method
  • Digital-analogue converter, drive device of display and image data conversion method
  • Digital-analogue converter, drive device of display and image data conversion method

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no. 2 example

[0053] by the above figure 1~Figure 4 can summarize a conversion method of image data, which is suitable for a driving device of a light-emitting diode display. For this digital-to-analog conversion method, please refer to Figure 5 . Figure 5 It is a flow chart of the image data conversion method according to the second embodiment of the present invention. Firstly, an image data is received (step S510), and the value of the image data corresponds to a duty cycle. Then, it is determined that the value of the image data is in the first value range or the second value range (step S520 ), wherein the value in the second value range is greater than the value in the first value range. When the value of the image data is in the first value range, the duty cycle corresponding to the image data is divided into at most N sub-duty cycles to generate a segmented pulse wave signal (step S530 ). When the value of the image data is in the second numerical interval, the duty cycle corres...

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Abstract

The invention provides a digital-analogue converter, a drive device of a display and an image data conversion method. The digital-analogue converter comprises a gray-scale decision circuit and a pulse segmenting unit, wherein the gray-scale decision circuit outputs a decision signal to the pulse segmenting unit according to a numerical value of image data; and the pulse segmenting unit connects the gray-scale decision circuit for receiving a judgment signal, selects reference signals with different numerical value orders according to the judgment signal and compares the reference signals withthe image data to generate different numbers of sub-work cycles and avoid a frame flicker and pulse distortion loss.

Description

technical field [0001] The present invention relates to a digital-to-analog converter, and in particular to a digital-to-analog converter applied to a light-emitting diode display, a driving device and an image data conversion method thereof. Background technique [0002] Light Emitting Diodes (LEDs) are small in size, power-saving and durable, and as the manufacturing process matures, the price drops. Recently, products using LEDs as light sources are becoming more and more popular. In addition, light-emitting diodes have low operating voltage (only 1.5-3V), can actively emit light and have a certain brightness, and the brightness can be adjusted by voltage or current. Diodes are used in a wide variety of end equipment ranging from automotive headlights, traffic lights, text displays, signage and large-screen video displays, to general and architectural lighting and LCD backlighting. [0003] The driving circuit of the light-emitting diode usually uses a pulse width modula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G3/32
Inventor 郭俊廷林俊甫
Owner MY SEMI
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