OLED Panel Block Processing for Peak Current Control
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Solution Overview
Problem
Existing organic light emitting display devices face issues with momentary peak currents when transitioning from dark to bright images, leading to potential power supply shutdowns and increased costs due to the need for frame memory to mitigate these effects.
Innovation Solution
The display device is divided into blocks, with each block's average picture level calculated and used to determine data voltages for pixels, allowing for peak luminance control without relying on frame memory by generating a peak luminance gain value based on previous block averages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If peak luminance control is implemented using related art methods, then luminance adjustment is achieved, but momentary peak current occurs causing power supply shutdown
Solution Approach 1:
The display panel is divided into multiple blocks (first block, second block, third block, etc.) and processed sequentially. The panel driver calculates average picture level for each block individually and applies peak luminance control block by block, rather than processing the entire frame at once. This segmentation prevents simultaneous peak current across the whole panel, eliminating the momentary peak current issue while maintaining luminance control effectiveness.
Solution Approach 2:
The panel driver calculates the average picture level for each block before displaying the image data. By determining the appropriate peak luminance gain value in advance based on the calculated average picture level, the system prepares the luminance adjustment parameters beforehand, allowing smooth transition without sudden current spikes that would cause power supply shutdown.
2Reliability
If frame memory is used to prevent momentary peak current, then power supply stability is improved, but device cost increases
Solution Approach 1:
The patent extracts and removes the frame memory component from the display system. Instead of using frame memory to delay data and prevent peak current, the invention achieves the same power supply stability through block-based sequential processing and real-time average picture level calculation, eliminating the need for additional memory hardware and reducing device complexity.
Solution Approach 2:
The panel driver itself performs the average picture level calculation and peak luminance gain determination without requiring external frame memory assistance. The system uses its own processing capabilities to analyze incoming data, calculate block-wise average picture levels, and generate appropriate control signals, making the system self-sufficient and eliminating dependency on additional memory components.
3Illumination intensity
If average picture level is calculated from entire frame, then luminance control is achieved, but momentary peak current occurs during transitions
Solution Approach 1:
Instead of calculating average picture level for the entire frame at once, the patent segments the display panel into multiple blocks and calculates average picture level for each block individually. This block-wise calculation allows progressive application of luminance control, preventing the sudden overall luminance change that causes momentary peak current during image transitions.
Solution Approach 2:
The patent implements dynamic, block-by-block processing where the panel driver sequentially processes each block (first block, second block, third block, etc.) with real-time average picture level calculation. This dynamic sequential approach allows the system to adapt luminance control progressively across different blocks, avoiding the static all-or-nothing luminance change that occurs with frame-wide processing and causes peak current.
Data Source
AI summary
An organic light emitting display device includes a display panel including a plurality of pixels each having an organic light emitting element that emits light according to a current corresponding to a data voltage, and a panel driver configured to divide the display panel into first to Mth blocks, calculate an average picture level of each block from data to be displayed in each of the plurality of pixels of each block, convert the data to be displayed by each of the plurality of pixels of each block into the data voltage, and supply the data voltage to each of the plurality of pixels of each block, where the panel driver controls the data voltage to be supplied to an ith block on the basis of the average picture levels of M number of blocks previous to the ith block, where i is a natural number from 1 to M.