Display Pixel Initialization Voltage Control for Luminance Uniformity
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Solution Overview
Problem
Wearable display devices face challenges in maintaining high display quality, particularly when used in different modes such as when mounted on a wearable device or not, due to variations in power supply voltage levels affecting pixel performance and image visibility.
Innovation Solution
A display device with distinct pixel regions initialized by different power sources, where the power supplier adjusts voltage levels based on the mode of operation, ensuring optimal power distribution to maintain image quality and reduce leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single initialization power source is used for all pixel regions, then device complexity is reduced, but display quality deteriorates due to non-uniform luminance across different operating modes
Solution Approach 1:
The display device divides the pixel array into multiple pixel regions (first pixel region and second pixel region), each with its own initialization power source (first initialization power source and second initialization power source). This segmentation allows independent voltage control for different regions, enabling uniform luminance across the display regardless of operating mode while maintaining manageable device complexity through modular power supply architecture.
2Stability of the object's composition
If the initialization voltage is kept constant across all operating modes, then power supply stability is improved, but display quality deteriorates due to characteristic changes in driving transistors under different voltage conditions
Solution Approach 1:
The initialization power sources are configured to dynamically adjust their voltage levels based on the operating mode. In first operating mode, both sources provide a first voltage level; in second operating mode, both sources provide a second voltage level that differs from the first. This dynamic adaptation ensures that driving transistors operate under optimal voltage conditions for each mode, maintaining consistent pixel luminance and preventing characteristic changes while preserving power supply stability through controlled transitions.
3Illumination intensity
If different voltage levels are applied to different pixel regions in all operating modes, then display quality is improved through optimized pixel performance, but device complexity increases due to multiple power supply circuits
Solution Approach 1:
The first and second initialization power sources are designed with multi-functionality to reduce device complexity. Each power source can operate at multiple voltage levels (first voltage level and second voltage level) depending on the operating mode, eliminating the need for separate dedicated power circuits for each region and mode. This universal design allows the same power supply structure to serve multiple functions across different operating conditions while maintaining optimized pixel performance.
Data Source
AI summary
A display device includes: a first pixel region including first pixels, each of the first pixels including a driving transistor to be initialized by a first initialization power source supplied from a first power line; a second pixel region including second pixels, each of the second pixels including a driving transistor to be initialized by a second initialization power source supplied from a second power line; and a power supplier to supply the first initialization power source and the second initialization power source, the first initialization power source and the second initialization power source having a same voltage level when the display device is driven in a first mode, and the first initialization power source and the second initialization power source having different voltage levels during at least one frame period when the display device is driven in a second mode.