Timing sequence generating circuit for improving definition of light-emitting diode (LED) display screen with gray scale

Abstract

The invention discloses a timing sequence generating circuit for improving the definition of a light-emitting diode (LED) display screen with gray scale. The timing sequence generating circuit comprises a sub-field pulse signal processing circuit, a sampling pulse signal frequency dividing circuit, a luminance setting circuit, a 6BIT data beam concentrating circuit and one-from-multiple selecting circuit. The 6BIT data beam concentrating circuit converts high six-figure data in input data into a group of serially output pulses with high-low electrical levels concentrated together by means of a data weight-free encoding change method, the output end of the sampling pulse signal frequency dividing circuit outputs serial shift pulse with unique frequency, and width equivalence and beam concentration of the high six-figure data are achieved. In consideration of transmission frequency, rest low-position data are not required to be processed. Only the timing sequence generating circuit in a control system is changed, a drive mode of a display unit is not changed, the transmission characteristics of serial signals are not changed, the definition of the LED display screen is improved under the condition that the system cost is not increased, and the timing sequence generating circuit has great actual using significance and popularization value.

Description

technical field [0001] The invention relates to the field of LED display screens, in particular to a timing generating circuit for improving the clarity of LED display screens with gray scales. Background technique [0002] The LED display with grayscale is mainly used to display grayscale content such as pictures and video images. The luminance of each LED pixel must be adjustable, and the fineness of the adjustment is the grayscale of the display. The higher the gray level, the more delicate the displayed image and the richer the color. If each 8BIT is quantized according to red, green, and blue three-color image signals, it is an image with 256 gray levels; each 10BIT quantization is an image with 1024 gray levels; each 12BIT quantization is an image with 4096 gray levels, etc. [0003] A grayscale LED display is usually composed of a signal source, a control system, a screen body and a power supply system. "Signal source" is the source of displayed information, which ...

AI Technical Summary

Problems solved by technology

Pixels reflect different gray levels through a group of pulses, and the difference between the sum of the widths of adjacent gray levels is the same, but the visual characteristics of the human eye for different pulse widths and different pulse intervals are inconsistent. Differences occur, making some adjacent gray levels have large differences in apparent brightness, and some are small, which cannot correctly reflect the brightness level characteristics of the source image, and the image definition is reduced

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