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1. WO2022001580 - LED DRIVE PULSE MODULATION METHOD AND APPARATUS

Publication Number WO/2022/001580
Publication Date 06.01.2022
International Application No. PCT/CN2021/098365
International Filing Date 04.06.2021
IPC
G09G 3/32 2016.1
GPHYSICS
09EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix
22using controlled light sources
30using electroluminescent panels
32semiconductive, e.g. using light-emitting diodes
CPC
G09G 2320/0247
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
02Improving the quality of display appearance
0247Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
G09G 2320/0271
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
02Improving the quality of display appearance
0271Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
G09G 2320/0276
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
02Improving the quality of display appearance
0271Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
0276for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
G09G 2320/0673
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
06Adjustment of display parameters
0673for control of gamma adjustment, e.g. selecting another gamma curve
G09G 3/2018
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix ; no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
2007Display of intermediate tones
2018by time modulation using two or more time intervals
G09G 3/2025
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix ; no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
2007Display of intermediate tones
2018by time modulation using two or more time intervals
2022using sub-frames
2025the sub-frames having all the same time duration
Applicants
  • 深圳市明微电子股份有限公司 SHENZHEN SUNMOON MICROELECTRONICS CO.,LTD [CN]/[CN]
Inventors
  • 李照华 LI, Zhaohua
Agents
  • 深圳市顺天达专利商标代理有限公司 SHENZHEN STANDARD PATENT & TRADEMARK AGENT LTD.
Priority Data
202010600020.828.06.2020CN
Publication Language Chinese (zh)
Filing Language Chinese (ZH)
Designated States
Title
(EN) LED DRIVE PULSE MODULATION METHOD AND APPARATUS
(FR) PROCÉDÉ ET APPAREIL DE MODULATION D'IMPULSIONS D'ATTAQUE DE DEL
(ZH) 一种LED驱动脉冲调制方法及装置
Abstract
(EN) Provided is an LED drive pulse modulation method, comprising the following steps: calculating a display period according to a specified quantity of sub-periods, number of gclk per row, and quantity of row scans; converting inputted grayscale data according to a specified grayscale series; obtaining high-grayscale data, low-grayscale data, and compensation data according to the quantity of sub-periods, the number of gclk per row, and grayscale data after segmenting and converting a composite number; and according to the high-grayscale data, the low-grayscale data, and the compensation data, calculating the quantity of grayscales requiring display in a current sub-period. According to the LED drive pulse modulation method of the present invention, any quantity of sub-periods and number of gclk per row can be specified so as to resolve the problem of gamma non-linearity, so that the display effect is more refined and real.
(FR) L'invention concerne un procédé de modulation d'impulsions d'attaque de DEL, comprenant les étapes suivantes : calcul d'une période d'affichage en fonction d'une quantité spécifiée de sous-périodes, d'un nombre de gclk par rangée, et d'une quantité de balayages de rangée ; conversion de données de niveau de gris d'entrée selon une série de niveaux de gris spécifiée ; obtention de données de haut niveau de gris, de données de bas niveau de gris et de données de compensation en fonction de la quantité de sous-périodes, du nombre de gclk par rangée, et des données de niveau de gris après segmentation et conversion d'un nombre composite ; et en fonction des données de haut niveau de gris, des données de bas niveau de gris et des données de compensation, calcul de la quantité de niveaux de gris nécessitant un affichage dans une sous-période actuelle. Selon le procédé de modulation d'Impulsions d'attaque de DEL de la présente invention, n'importe quelle quantité de sous-périodes et n'importe quel nombre de gclk par rangée peuvent être spécifiés de façon à résoudre le problème de non-linéarité de gamma, de telle sorte que l'effet d'affichage est plus affiné et réel.
(ZH) 本发明提供了一种LED驱动脉冲调制方法,包括以下步骤:根据设定的子周期数、每行gclk个数和行扫数计算显示周期;根据设定的灰度级数对输入的灰度数据进行转换;根据所述子周期数、所述每行gclk个数和合成数分割转换后的灰度数据,得到高灰数据、低灰数据和补偿数据;根据所述高灰数据、所述低灰数据和所述补偿数据计算出当前子周期需要显示的灰度数。通过本发明的LED驱动脉冲调制方法可以设定任意的子周期数和每行gclk个数以解决gamma不线性的问题,使得显示效果更为细腻真实。
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