CN111489688A

CN111489688A - Method for optimizing low-gray display effect

Info

Publication number: CN111489688A
Application number: CN202010356537.7A
Authority: CN
Inventors: 徐银森; 张宏根; 李小东; 杨林; 颜色金
Original assignee: Sichuan Suining Lipuxin Microelectronic Co ltd
Current assignee: Sichuan Suining Lipuxin Microelectronic Co ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-08-04

Abstract

The invention discloses a method for optimizing low-gray display effect, which comprises the following steps: the driving chip receives gray data composed of common integer data and remainder data; the remainder data is composed of N groups of remainder coefficient data R_iRemainder weight W of equal sum_RComposition is carried out; adding P remainder weights to T in each display frame_jThe remainder coefficient data is L_iThe remainder data group of (2) is displayed complementarily. The invention adds a plurality of groups of low-weight remainder coefficient groups to a plurality of groups of remainder coefficients with the same weight, and supplements and displays to solve the problem of gray scale deficiency.

Description

Method for optimizing low-gray display effect

Technical Field

The invention relates to the technical field of gray scale display, in particular to a method for optimizing a low gray scale display effect.

Background

In an L ED display screen driving chip, if the display clock is faster, the gray scale displayed in the same time is richer, but when the clock is faster, the waveform of PWM deviates from the ideal waveform, for a device receiving public integer data and remainder coefficient data in a time sharing mode, when the total gray scale value is lower, the remainder data is generally only displayed, and if the remainder weight is smaller, the phenomenon of uneven low gray scale display is generated during display, and if the remainder weight is larger, the gray scale jumping phenomenon is generated because of large jumping of the actually accumulated display gray scale in the data overlapping process due to partial gray scale missing during display.

Disclosure of Invention

The invention aims to provide a method for optimizing low-gray level display effect, which is characterized in that a plurality of groups of low-weight remainder coefficient groups are added in a plurality of groups of remainder coefficients with the same weight for supplementing display, so that gray level data are more uniform in display, and the gray level jump phenomenon caused by gray level loss is effectively prevented.

To solve the above technical problem, the present invention provides a method for optimizing a low gray scale display effect, the method comprising:

the driving chip receives gray data composed of common integer data and remainder data;

the remainder data is composed of N groups of remainder coefficient data R_iRemainder weight W of equal sum_RComposition is carried out;

adding P remainder weights to T in each display frame_jThe remainder coefficient data is L_iThe remainder data group of (2) is displayed complementarily.

Further, the remainder weight T_jLess than remainder weight W_R. When the gray scale is displayed in the low gray scale, the increased value of the remainder weight is smaller than the value of the original remainder weight, so that the display of the low gray scale is more uniform, the display effect is improved, the numerical value of the gray scale increase is not large while the display is supplemented, and the gray jump is prevented.

Further, the number of P is any one of 2, 4, 8, and 16.

Further, the remainder data is increased by P remainder weights T_jThe remainder coefficient data is L_iThe values of the post-remainder data of the remainder data group are consecutive integer values.

The beneficial effects obtained by the invention are as follows: in the low gray scale display process, the remainder data with smaller remainder weight is added and is input into the driving chip together with the originally received and displayed remainder data for display, so that the phenomenon of uneven gray scale display can be effectively reduced, the problem of gray scale deficiency is complemented, the display in the low gray scale display is more uniform, and the display effect is improved.

Drawings

FIG. 1 is a graph comparing the actual PWM pulse with the ideal PWM pulse;

FIG. 2 is a schematic diagram illustrating a PWM pulse display effect according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a PWM pulse display effect according to another embodiment of the present invention.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

The invention discloses a method for optimizing low-gray display effect, which comprises the following steps:

Further, as an alternative embodiment, the remainder weight T_jLess than remainder weight W_R。

Further, as an optional implementation manner, the number of P is any one of 2, 4, 8, and 16.

Further, as an optional implementation manner, the remainder data is increased by P remainder weights to T_jThe remainder coefficient data is L_iThe values of the post-remainder data of the remainder data group are consecutive integer values.

The following is further illustrated with reference to specific embodiments of the invention:

the remainder data R of the method is divided into N groups with the same remainder weight W_RSum remainder coefficient data R_iAnd if the residue data R is formed, the calculation formula of the residue data R is as follows:

when W is_R1, and R<When N is, R_maxEach set of low-gray-scale PWM has one period of PWM pulse, which results in incomplete channel opening during display, and more easily causes inconsistency between channels, resulting in non-uniform low-gray-scale display, as shown in fig. 1.

In one embodiment, the PWM pulse is controlled to increase with the increase of the gray scale value, where N is 4, W_RThe PWM pulse display effect is shown in fig. 2 at 4. That is, after each group displays 4 full cycles of PWM, the display effect is such that the PWM pulses do not display a narrower width in each group when displayed in the other groups.

In another embodiment, as shown in FIG. 3, the remainder coefficient data R is maintained_iLow bit width while increasing P remainder weights to T_jThe remainder data group of (1) represents R/W_RThe remainder portion, not shown, when the value of the total remainder data L is obtained by the following equation:

when W is_RWhen N is 4, P may be 2, where the weight V is₁＝1，V₂2, so that the expression can represent any R integer value.

For example, when P is 2, the remainder L is derived according to the above formula:

by adding the remainder data of the two low weight groups according to the above-mentioned remainder data L, the low gray scale display PWM includes 4 remainder data groups with weight 4, one remainder data group with weight 2, and one remainder data group with weight 1.

In summary, the actual samples of the present invention are prepared according to the description and the drawings, and after a plurality of usage tests, the effect of the usage tests proves that the present invention can achieve the expected purpose, and the practical value is undoubted. The above-mentioned embodiments are only for convenience of illustration and not intended to limit the invention in any way, and those skilled in the art will be able to make equivalents of the features of the invention without departing from the technical scope of the invention.

Claims

1. A method for optimizing a low gray scale display effect, the method comprising:

2. The method of claim 1, wherein: the remainder weight T_jLess than remainder weight W_R。

3. The method of claim 2, wherein: the number of the P is any one of 2, 4, 8 and 16.

4. The method of claim 3, wherein: the residueIncreasing P remainder weights to T for number data_jThe remainder coefficient data is L_iThe values of the post-remainder data of the remainder data group are consecutive integer values.