Display Sub-Pixel Electrode Area Optimization for Luminous Intensity
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Solution Overview
Problem
Current LED displays face challenges in achieving high light emitting efficiency while maintaining low power consumption and small volume, particularly in ensuring consistent luminous intensity across sub-pixel units of different colors.
Innovation Solution
The display device incorporates sub-pixel units with light emitting layers of different colors, where the area ratios of electrodes to effective light emitting regions are designed to optimize coupling capacitance, ensuring consistent voltage difference variations and thus equal luminous intensity across sub-pixel units, utilizing a structure with overlapping electrodes and data lines to manage parasitic capacitance and coupling capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the area of electrodes in sub-pixel units is increased to improve light emitting efficiency, then the luminous intensity increases, but the device volume increases
Solution Approach 1:
The patent applies local quality by making the electrode area proportional to the light emitting efficiency requirements of each specific sub-pixel unit. Blue sub-pixel units have larger electrode areas overlapping with data lines compared to green or red sub-pixel units, as blue LEDs typically have lower efficiency. This localized differentiation optimizes overall display efficiency without uniformly increasing device volume.
2Reliability
If the overlapping area between electrodes and data lines is increased to manage parasitic capacitance, then the coupling capacitance increases, but the voltage difference variation decreases
Solution Approach 1:
The patent changes the geometric parameter of electrode area to control capacitance effects. By adjusting the overlapping area between electrodes and data lines, the patent optimizes the balance between parasitic capacitance (which causes voltage drops) and coupling capacitance (which provides charge compensation). This parameter optimization stabilizes voltage differences during data line switching without requiring complex additional circuitry.
3Reliability
If different electrode areas are used for sub-pixel units of different colors, then the luminous intensity consistency improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent deliberately introduces asymmetry in electrode dimensions across different sub-pixel units. Instead of using identical electrode sizes for all colors, the patent designs asymmetric electrode areas where blue sub-pixel electrodes are larger than green or red electrodes. This asymmetric design compensates for inherent differences in LED chip efficiency among colors, achieving luminous intensity consistency while using standard manufacturing processes.
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 design achieves consistent luminous intensity variations among sub-pixel units of different colors, enhancing display quality by optimizing light emitting efficiency and power management.
Implementation Method 1
The first light emitting layer is disposed on the first electrode, wherein a luminescence color of the first light emitting layer is different from a luminescence color of the second light emitting layer, and the luminescence color of the first light emitting layer is blue
Implementation Method 2
The first electrode has a first region overlapping the first data line in the normal direction. The first region has a first area... the area of the first region is greater than an area of a second region
Data Source
AI summary
A display device includes a substrate, first and second data lines, and first and second sub-pixel units. The first sub-pixel unit includes a first electrode and a first light emitting layer disposed on the first electrode. The first electrode has a first region with a first area overlapping the first data line. The second sub-pixel unit includes a second electrode and a second light emitting layer disposed on the second electrode. The second electrode has a second region with a second area overlapping the second data line, wherein the first area is greater than the second area. The luminescence color of the first light emitting layer and the luminescence color of are different, and the luminescence color of the first light emitting layer is blue.