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LED display screen mixed weight-value time-slice scanner

A technology of scanning devices and time slices, applied to static indicators, instruments, etc., can solve problems such as limiting the scanning frequency of the display screen and frequent reading

Active Publication Date: 2009-09-02
CHANGCHUN CEDAR ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two scanning methods read the memory of the image memory too frequently (read the memory of the image memory once, scan a time slice of a certain weight), and are easily limited by hardware resources and other aspects, which greatly limit the display capacity. scanning frequency

Method used

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  • LED display screen mixed weight-value time-slice scanner
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  • LED display screen mixed weight-value time-slice scanner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018]In this embodiment, taking 72 weight time slices and reading the weight time slice twice as an example, the present invention is further described in detail.

[0019] For the scanning method of 72 weight time slices, the present embodiment divides the total number of weight time slices into 24 groups, and one of the grouping methods is shown in Table 1:

[0020] Table 1

[0021] (32，1 / 512) (32，1 / 256) (32，1 / 128) (32，1 / 64) (32，1 / 32) (32，1 / 16) (32，1 / 8) (32，1 / 4) (32，1 / 2) (32，1) (32，2) (32，2) (32，4) (32，4) (32，4) (32，4) (16，8) (16，8) (16，8) (16，8) (16，8) (16，8) (16，8) (16，8)

[0022] Each cell in the table is a set of data, and the value in it represents the weight, the former weight is the repeated weight, and the latter is the single weight.

[0023] When scanning is started, the pixel data stored in the image memory 1 is compared with the weight time slices generated by the repeated weight circuit 2 and the single weight circui...

Embodiment 2

[0025] In this embodiment, taking 72 weight time slices and reading three repeated weight time slices as an example, the present invention is further described in detail.

[0026] For the scanning mode of 72 weight time slices, the present embodiment divides the total number of weight time slices into 18 groups, one of which is shown in Table 2:

[0027] Table 2

[0028] (32，1 / 512) (32，1 / 256) (32，1 / 128) (32，1 / 64) (32，1 / 32) (32，1 / 16) (32，1 / 8) (32，1 / 4) (32，1 / 2) (32，32) (16，32) (16，1) (16，2) (16，2) (16，16) (8，8) (8，8) (4，4)

[0029] Each cell in the table is a group, and the value in it represents the weight, the former weight is the repeated weight, and the latter is the single weight.

[0030] When scanning is started, the pixel data stored in the image memory 1 is compared with the weight time slices generated by the repeated weight circuit 2 and the single weight circuit 3 respectively through the first comparator 4 and the second comparat...

Embodiment 3

[0032] In this embodiment, taking 136 weight time slices and reading three repeated weight time slices as an example, the present invention is further described in detail.

[0033] For the 136-piece weight time slice scanning method, the present embodiment divides the total weight time slice into 34 groups, one of which is shown in Table 3:

[0034] table 3

[0035] (64，1 / 512) (64，1 / 256) (64，1 / 128) (64，1 / 64) (64，1 / 32) (64，1 / 16) (64，1 / 8) (64，1 / 4) (64，1 / 2) (64，1) (64，2) (64，2) (64，4) (64，4) (64，4) (64，4) (64，8) (64，8) (64，8) (64，8) (64，8) (32，8) (32，8) (32，8) (32，64) (32，16) (32，16) (32，16) (32，16) (32，16) (32，16) (16，32) (16，32) (16，16)

[0036] Each cell is a set of data in which the value represents the weight, the former weight is a repeated weight, and the latter is a single weight.

[0037] When scanning is started, the pixel data stored in the image memory 1 is compared with the weight time slices generated by t...

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Abstract

The invention relates to an LED display screen mixed weight-value time-slice scanner. The input of a first comparator of the LED display screen mixed weight-value time-slice scanner is respectively connected with the output of a repeated weight-value circuit and the output of an image memory, the output of the first comparator is connected with the input of a repeated weight-value 1-bit brightness data memory, the input of a second comparator is respectively connected with the output of a single weight-value circuit and the output of an image memory, the output of the second comparator is connected with the input of a single weight-value 1bit brightness data memory, the output of the repeated weight-value 1-bit brightness data memory and the output of the single weight-value 1-bit brightness data memory are respectively connected with the input of an option circuit, and the output of the option circuit is connected with a scanning output circuit. The invention can scan n+1 times of weight-value time slices when reading the memory of the image memory at one time, thus, the refreshing frequency is increased by n+1 times.

Description

technical field [0001] The invention relates to an LED display screen weight time slice scanning device, in particular to an LED display screen mixed weight time slice scanning device. technical background [0002] For the driving technology of LED flat panel display, especially the image display technology, it mainly relies on the pulse width modulation method at present. The methods to realize pulse width modulation mainly include counter method, comparator method and so on. The comparator method uses the weight of the display data to scan the display screen repeatedly (also known as refresh) per unit time, thereby forming a video image with gray levels; this method is also called the weight time slice scanning method, The conduction time of each LED adopts the method of weighted summation. For the gray value R[MSB:LSB] of any LED pixel, there is a unique weighted time sum corresponding to it, expressed as T R ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G3/32
Inventor 丁铁夫王瑞光严飞李强
Owner CHANGCHUN CEDAR ELECTRONICS TECH CO LTD