OLED Pixel Region Layout for Burn-In Suppression
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Solution Overview
Problem
The provision of a transmission portion in display panel pixels leads to reduced light-emitting areas, increasing current density and promoting burn-in, which results in irreversible luminance decrease and user discomfort.
Innovation Solution
A pixel structure is implemented with distinct regions: a first region for light emission and transmission, a second region with larger light-emitting area, and a third region without transmission windows, distributing current density to mitigate burn-in.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transmission portion is provided in display panel pixels to enable light transmission for image sensor placement, then the display panel can be made transparent for sensor integration, but the light-emitting area of pixels is narrowed, increasing current density and promoting burn-in
Solution Approach 1:
The patent applies local quality by creating different pixel structures in different regions: central pixels have transmission windows for sensor access, while peripheral pixels have larger light-emitting areas. This spatial differentiation of pixel properties resolves the contradiction by localizing the transmission function where needed while maintaining reliability in other areas.
2Adaptability or versatility
If the light-emitting area of pixels is reduced to accommodate transmission windows, then image sensor module can be arranged immediately below the display panel, but current per unit area increases, causing deterioration of the self light-emitting element and burn-in
Solution Approach 1:
The patent segments the display panel into different pixel regions with different characteristics. Central pixels are segmented to include transmission windows, while peripheral pixels maintain full light-emitting areas. This segmentation allows the system to achieve transparent display capability in necessary areas while preserving element lifetime in areas where it is not required.
3Ease of manufacture
If transmission portion is provided only in partial pixel region, then image sensor can be positioned below specific area, but burn-in occurs in this pixel region causing partial luminance lowering and user discomfort
Solution Approach 1:
The patent employs asymmetry by creating an asymmetric pixel layout where central pixels differ from peripheral pixels. The central pixels have transmission windows while peripheral pixels have larger light-emitting areas. This asymmetric design allows flexible sensor placement in the center while maintaining display uniformity through the larger peripheral pixels that compensate for the reduced central luminance.
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
The pixel structure effectively reduces burn-in by balancing current density across different light-emitting areas, maintaining consistent luminance and display quality.
Implementation Method 1
a self light-emitting element such as an organic EL element (hereinafter, organic light-emitting device: OLED)
Implementation Method 2
a first non-light emitting region including a first transmissive window configured to transmit visible light
Data Source
AI summary
Provided are an image display device and an electronic device capable of suppressing burn-in.An image display device includes a plurality of pixels arranged two-dimensionally. The plurality of pixels includes: a first pixel region including a pixel configured to emit light and transmit visible light; a second pixel region arranged around the first pixel region, and including a pixel configured to emit light with an area larger than a light-emitting area of a pixel in the first pixel region; and a third pixel region arranged around the second pixel region, and including a pixel configured to emit light with an area larger than a light-emitting area of a pixel in the second pixel region.