Display Device Driving Circuit for Burn-In Prevention
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Solution Overview
Problem
High definition organic EL display devices in smartphones experience increased power consumption and screen burn-in due to continuous display of small amounts of data, as they require operating a large screen even for basic data, leading to inefficiencies in power reduction and limited prevention of screen burn-in.
Innovation Solution
A display device with a driving circuit that operates in both normal and low power consumption modes, featuring a fixed display pattern on the panel, where the display position is changed for each frame in the low power mode, utilizing an internal control signal generation circuit, memory for storing image data, and an image signal output circuit to convert and supply image voltage, reducing power consumption and preventing screen burn-in.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If partial driving is applied to display basic data on organic EL display panels, then power consumption is reduced, but screen burn-in occurs due to continuous display at the same position
Solution Approach 1:
The patent applies dynamics by making the display position variable rather than fixed. The control circuit changes the display position of basic data patterns in accordance with a predetermined pattern for each frame, allowing the same data to be displayed at different locations over time. This dynamic repositioning prevents organic EL elements from continuous exposure to the same stress conditions, thereby preventing screen burn-in while maintaining low power consumption through partial driving.
Solution Approach 2:
The patent implements periodic action by using a predetermined pattern that repeats the display position changes in a cyclic manner. The control circuit follows a predetermined sequence to shift the display position periodically, ensuring that after a certain number of frames, the pattern repeats. This periodic repositioning prevents permanent deterioration by distributing the display stress over time while maintaining the low power consumption benefit of partial driving.
2Reliability
If the display position of basic data is changed for each frame, then screen burn-in is prevented, but device complexity increases due to additional control circuitry
Solution Approach 1:
The patent applies self-service by having the control circuit generate the position change pattern autonomously based on a predetermined sequence stored internally. The control circuit does not require external input to determine display position changes; it automatically follows the predetermined pattern to shift display positions. This self-service approach prevents screen burn-in through automatic position variation while minimizing the addition of external control complexity.
Solution Approach 2:
The patent implements preliminary action by storing the predetermined pattern for display position changes in advance within the control circuit. The pattern is prepared and stored before actual display operation begins, allowing the control circuit to retrieve and execute position change instructions without real-time computation. This preliminary preparation simplifies the control circuit design by pre-computing the positioning logic rather than requiring complex real-time calculation.
3Manufacturing precision
If a large screen organic EL display panel is operated for displaying small amounts of data, then display quality is maintained, but power consumption increases significantly
Solution Approach 1:
The patent applies partial action by displaying only the necessary basic data patterns rather than full-resolution images across the entire display panel. The control circuit selectively activates only the required display regions for showing basic information like time, date, and notifications, leaving the rest of the large screen in a low-power or off state. This partial display approach maintains adequate display quality for the intended purpose while dramatically reducing power consumption compared to operating the full large screen at high definition.
Data Source
AI summary
The subject of the present invention is preventing the generation of screen burn-in in the case of low power consumption driving. A display panel of the present invention includes an image line for inputting an image voltage to each pixel, and a drive circuit, the drive circuit includes an internal control signal generation circuit for generating a control circuit, a memory for storing image data of a fixed display pattern in the case of the low power consumption drive mode, an image voltage output means for converting image data read from the memory to an image voltage and supplying the image voltage to the image line, and a means for changing a read timing of image data read from the memory, wherein the read timing of image data and a display position of the fixed display pattern to be displayed on the display panel is changed for each frame.