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Method for grayscale rendition in an am-oled

A technology of grayscale and amplitude, applied to instruments, static indicators, etc., can solve problems such as blurred images

Inactive Publication Date: 2008-11-26
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The brain has a very difficult time interpreting this movement, resulting in a blurry picture or a vibrating picture (judder)

Method used

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  • Method for grayscale rendition in an am-oled
  • Method for grayscale rendition in an am-oled
  • Method for grayscale rendition in an am-oled

Examples

Experimental program
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Embodiment Construction

[0039] According to the invention, a video frame is divided into a plurality of subframes, wherein the data signal applied to a cell is variable in amplitude and the data signal of a cell consists of a plurality of independent elementary data signals which, during a subframe, are Each of the is applied to the cell. The number of subframes is greater than 2 and depends on the refresh rate that can be used in AMOLED.

[0040] In this manual, the following symbols are used:

[0041] -C L means as figure 2 Shown is the amplitude of the data signal of the unit displaying the gray level L in the conventional method;

[0042] -SF i Indicates the i-th subframe in the video frame;

[0043] -C'(SF i ) represents the subframe SF of the video frame i The amplitude of the basic data signal;

[0044] -D i Indicates subframe SF i duration of

[0045] -C min is the first threshold value, representing that above the data signal value, the work of the cell is considered good (fast ...

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PUM

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Abstract

The present invention relates to a grayscale rendition method in an active matrix OLED (Organic Light Emitting Display) where each cell of the display is controlled via an association of several Thin-Film Transistors (TFTs). In order to improve the grayscale rendition in an AM-OLED when displaying low grayscale levels and / or when displaying moving pictures, it is proposed to split each frame into a plurality of subframes wherein the amplitude of the data signal applied to a cell of the AM-OLED can be adapted to conform to the visual response of a CRT display. According to the invention, the video frame used for displaying an image is divided into N consecutive subframes, with N>=2, and the data signal applied to the cell comprises N independent elementary data signals, each of said elementary data signals being applied to the cell during a subframe. The grayscale level displayed by the cell during the video frame is depending on the amplitude of the elementary data signals and the duration of the subframes.

Description

technical field [0001] The present invention relates to a grayscale reproduction method in an active matrix OLED (Organic Light Emitting Display), in which each cell of the display is controlled by a combination of a plurality of thin film transistors (TFT). The method was developed especially but not exclusively for video applications. Background technique [0002] The structure of active matrix OLEDs or AM-OLEDs is known. It includes: [0003] - An active matrix, comprising, for each cell, a combination of several TFTs, with capacitors connected to the OLED material; the capacitors serve as storage components during a portion of a video frame to store a value representing the value to be used by the cell in the next video frame or the video information displayed during the next part of the video frame; the TFT is used as a switch that can select the unit, stores data in the memory, and the unit displays the video information corresponding to the stored data; [0004] - ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32G09G3/20
CPCG09G3/2081G09G2320/0266G09G3/20G09G2300/0809G09G3/3233G09G2320/106G09G2320/0261G09G3/2022G09G3/32
Inventor 塞巴斯蒂安·魏特布雷赫卡洛斯·科里亚菲利普·勒鲁瓦
Owner INTERDIGITAL CE PATENT HLDG