OLED Display Block Control for Black Image Power Reduction
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Solution Overview
Problem
Organic light emitting displays face high power consumption and leakage current issues when attempting to display black images, as existing methods do not effectively reduce power usage or eliminate light emission during black data insertion.
Innovation Solution
The display is divided into blocks, with a timing controller managing scan and emission control signals to set pixels in a non-emission state, reducing power consumption by stopping signal supply to blocks displaying black and using emission block control signals to insert black images without additional black data, thereby reducing driving frequency and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If black data is supplied to pixels to display black images, then picture quality is improved, but power consumption is not reduced and leakage current causes light emission
Solution Approach 1:
The display panel is divided into multiple blocks (e.g., four blocks) that can be independently controlled. The timing controller can selectively stop scan signals and data signals to specific blocks during black image display periods, allowing power consumption reduction in blocked regions while maintaining image quality in active regions. This segmentation enables partial power saving without compromising overall display performance.
2Illumination intensity
If black data insertion is performed to improve moving picture quality, then picture quality is improved, but leakage current prevents desired black image display
Solution Approach 1:
The patent extracts and eliminates the leakage current problem by blocking the supply of scan signals and data signals to pixels during black image display periods. By stopping the signal supply to blocked blocks, the leakage current that prevents proper black image display is eliminated, enabling accurate black image reproduction while maintaining improved picture quality through black data insertion in active regions.
3Productivity
If scan signals and data signals are continuously supplied to all pixels, then image display is maintained, but power consumption increases during black image insertion
Solution Approach 1:
The timing controller dynamically adjusts signal supply to different blocks based on display content. During black image display periods, scan signals and data signals are stopped to blocked blocks while continuing to non-blocked blocks. This dynamic control allows the system to maintain image display productivity in active regions while reducing power consumption in blocked regions, achieving energy-efficient operation without sacrificing display continuity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for reduced power consumption and accurate black image display by blocking current to OLEDs during black image insertion, minimizing leakage current and driving frequency, thus enhancing power efficiency and image quality.
Implementation Method 1
the organic light emitting display display images using organic light emitting diodes (OLEDs) that generate light by the re-combination of electrons and holes
Data Source
AI summary
An organic light emitting display includes pixels at crossing regions of scan lines, data lines, and emission control lines, a display unit including the pixels and divided into at least i blocks, wherein i is a natural number greater than 1, each of the blocks including corresponding scan lines, scan drivers each coupled to a corresponding one of the blocks for supplying scan signals to the corresponding scan lines, emission drivers included in the blocks for supplying emission control signals to the emission control lines, each of the blocks includes corresponding emission control lines, a data driver for supplying data signals to the data lines, a timing controller for controlling the scan drivers, the emission drivers, and the data driver and for supplying emission block control signals to control light emission of the pixels, wherein the pixels are set in a non-emissive state when receiving the emission block control signal.