Display Pixel Circuit Overlap for Aperture Ratio and Mirror Function
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Solution Overview
Problem
Current display devices face challenges in achieving improved image quality and reflective quality, particularly in the design of pixel structures and the integration of reflective members to serve both display and mirror functions.
Innovation Solution
The display device incorporates a substrate with pixel regions and peripheral regions, featuring first, second, and third sub-pixels with specific light emitting regions and anode electrodes, along with a reflective member on the encapsulation member, optimized for improved light transmittance and reflective characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the light emitting element overlaps with the pixel circuit in the first sub-pixel, then the aperture ratio and light transmittance are improved, but the manufacturing complexity and electrode routing difficulty increase
Solution Approach 1:
The anode electrode is extended into the third dimension by forming it to overlap with the pixel circuit in the vertical direction (along the light emitting direction). This allows the electrode to route through the Z-axis rather than requiring complex lateral routing in the X-Y plane, thereby increasing aperture ratio while managing routing complexity through vertical stacking.
Solution Approach 2:
The anode electrode of the light emitting element is nested within the vertical space above the pixel circuit, with the electrode extending downward to overlap with the circuit components. This nesting arrangement allows the electrode to pass through the vertical column occupied by the pixel circuit without requiring additional lateral space, thus improving aperture ratio while maintaining compact pixel structure.
2Reliability
If the reflective member is disposed on the encapsulation member, then the reflective quality and mirror function are improved, but the device structure and layer configuration become more complex
Solution Approach 1:
The encapsulation member serves dual functions: it provides the necessary encapsulation and protection for the light emitting element while also serving as the substrate for the reflective member. This multi-functionality eliminates the need for a separate reflective substrate layer, thereby improving reflective quality without proportionally increasing structural complexity.
Solution Approach 2:
The reflective member is merged with the encapsulation member by disposing the reflective layer on the outer surface of the encapsulation member. This combining approach integrates the reflective function into the existing encapsulation structure rather than adding a completely separate component, thus enhancing mirror function while minimizing additional structural complexity.
3Illumination intensity
If the anode electrode extends to overlap with multiple pixel circuits, then the light transmittance is improved, but the electrode area and material consumption increase
Solution Approach 1:
The anode electrode is designed with spatially varying properties: in regions where it overlaps with pixel circuits, the electrode maintains high transmittance characteristics to maximize light output, while in regions extending to adjacent pixel circuits, the electrode can have reduced dimensions or modified material composition to minimize material consumption. This local optimization allows high light transmittance where needed while reducing overall material usage.
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 configuration enhances image quality by increasing light transmittance and aperture ratio while allowing the device to function as a clear mirror when not in use, minimizing diffused reflection and maintaining uniformity across regions.
Implementation Method 1
a plurality of pixels disposed in the pixel region, the plurality of pixels including first, second, and third sub-pixels each including a light emitting region that is configured to emit light of a specific color; a light emitting element disposed in the light emitting region of each of the first, second, and third sub-pixels
Implementation Method 2
The reflective member may have specular reflection characteristics
Data Source
AI summary
A display device includes: a substrate including a pixel region and a peripheral region; a plurality of pixels provided in the pixel region, the plurality of pixels including first, second, and third sub-pixels each including a light emitting region; a light emitting element disposed in the light emitting region of each of the first, second, and third sub-pixels; a pixel circuit disposed in each of the first, second, and third sub-pixels, the pixel circuit configured to drive the light emitting element, wherein each pixel includes a first region in which the pixel circuit is disposed and a second region except the first region, wherein the light emitting element disposed in the first sub-pixel overlaps with the pixel circuit, and the light emitting element disposed in the second sub-pixel is disposed in the second region.