Greyscale scanning output method and device
A scanning output, grayscale technology, applied in instruments, static indicators, etc., can solve problems such as abnormal color, electromagnetic interference, high manufacturing cost design changes, etc., to achieve the effect of excellent scanning frequency and improved brightness efficiency
Active Publication Date: 2012-05-30
GCI SCI & TECH
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, when increasing the refresh rate by shortening the minimum output time T, there is a very big restriction: when the minimum output time T is less than the minimum output pulse threshold of the driver chip, there will be three problems: damage Driver chip or light-emitting diode, abnormal color, serious electromagnetic interference
In order to solve these problems, the usual way is to use a smaller minimum output pulse threshold, or use a chip with built-in PWM (Pulse Width Modulation, pulse width modulation) output, but it pays a higher price for this. Manufacturing costs and the cost of extensive design changes
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0025] The basic idea of the solution of the present invention is to combine and output the low-order gray scales with a single output time lower than the minimum output pulse threshold value of the driver chip, so that the refresh rate can be improved and the minimum output pulse of the driver chip can be satisfied. Threshold value requirements, and can not affect the actual minimum output time.
[0026] see figure 2 Shown is a schematic flow chart of an embodiment of the grayscale scanning output method of the present invention, which includes steps:
[0027] Step S101: Count the sum of the output time of each gray scale in the preset number of cycles respectively, and proceed to step S102;
[0028] Step S102: Taking the preset number as an equal fraction, divide the sum of the output times of each gray scale into equal parts, and proceed to step S103;
[0029] Step S103: respectively judge whether the output time after equal division of each gray scale is less than the...
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
Login to View More Abstract
The invention discloses greyscale scanning output method and device, wherein the method comprises the following steps of: respectively counting the sum of the output time of all greyscales in periods in a preset number and respectively dividing the output time into several parts by regarding the preset number as the part number; respectively judging whether the output time of each greyscale afterbeing divided is less than a minimal output pulse threshold of a drive chip or not; and if so, searching an optimal part number and regarding the output time after being divided into several parts according to the optimal part number as the single output time of the greyscale for scanning output. In the scheme of the invention, the scanning in a plurality of periods is combined, and the single output time which is less than the minimal output pulse threshold of the drive chip is combined for scanning output to meet the requirement on the minimal output pulse threshold of the drive chip. The scanning after the greyscale is combined can reduce the consumption of data transmission time so that the scanning frequency is better than that of the normal scanning mode, the brightness frequency isimproved, and the actual minimal output time is not influenced.
Description
technical field [0001] The invention relates to the technical field of display output, in particular to a grayscale scanning output method and a grayscale scanning output device. Background technique [0002] In the display output of the LED screen, the brightness is controlled by controlling the sum of the lighting output time of the light-emitting diodes within a certain period. For the LED screen with n-bit gray scale, the output of K gray scale needs to transmit data. K times, with T representing the minimum output time, then the sum of the output time of the light-emitting diodes of this n-bit grayscale LED screen is: [0003] 2 0 *T+2 1 *T+…+2 K *T+…+2 n-1 *T+2 n *T [0004] =(2 0 +2 1 +...+2 K +...+2 n-1 +2 n )*T [0005] =(2 n -1)*T [0006] Thus a scanning period Ts=(2 n -1)*T+Tw, where Tw is the time lost for data transmission and newline protection, such as figure 1 Shown is a schematic diagram of the time composition of a scan cycle. [0007] Acc...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/20G09G3/32
Inventor 周伟贤伍清华谭新庚陈金超李亮
Owner GCI SCI & TECH