Homochromatic LED Display Panel with Color Filter Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Full-color LED display panels face challenges with thick cell thickness, high production costs, and high defect rates due to the need for different processing cycles and materials for LEDs of various colors.
Innovation Solution
The use of homochromatic LED semiconductor chips and filter layers of specific colors, where each LED semiconductor chip emits light of a single color, allowing for simultaneous production and reducing the complexity and cost of manufacturing, while filter layers of different colors generate multi-color sub-pixel units for full-color display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different composition materials and processing cycles are used for LEDs of different colors, then full-color display capability is achieved, but the process cycle is prolonged and production costs are raised
Solution Approach 1:
The patent segments the color generation function into two independent parts: (1) a single-color LED light source that emits monochromatic light, and (2) a filter layer that selectively transmits specific wavelengths. This segmentation allows the LED to be manufactured using a single processing cycle while the filter layer handles color differentiation, thereby resolving the contradiction between full-color capability and production efficiency
Solution Approach 2:
The filter layer acts as an intermediary between the LED light source and the final displayed color. Instead of manufacturing different colored LEDs directly, the filter layer mediates by selecting and transmitting specific wavelengths from the LED's emission spectrum, enabling full-color display without requiring different processing cycles for different colors
2Adaptability or versatility
If different drivers and sizes are used for LEDs of different colors, then color-specific performance is optimized, but the cell thickness and production costs are largely raised
Solution Approach 1:
The patent applies universality by using a single LED chip design and driver circuit that can serve all color requirements. The LED structure and driving mechanism remain uniform across different display positions, while the filter layer provides the color-specific functionality. This eliminates the need for different sized LEDs and drivers for different colors, thereby reducing cell thickness and production costs
3Manufacturing precision
If different composition materials are used for LEDs of different colors, then color accuracy is improved, but the defect rate of products is increased
Solution Approach 1:
The patent applies homogeneity by using LEDs with identical composition materials and structures for all color positions. The LED chips are manufactured uniformly with the same semiconductor materials and doping processes, eliminating variations in composition that lead to defects. Color accuracy is maintained through the filter layer rather than through material variation, thereby reducing the defect rate
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 approach shortens the production cycle, reduces production costs, and decreases the defect rate, while achieving a thinner display panel and enabling full-color display with reduced cell thickness and costs.
Implementation Method 1
The LED is packaged by a transparent epoxy resin. The LED semiconductor chip includes two parts. One part is a P-type semiconductor dominated by holes inside. The other part is an N-type semiconductor composed mainly of electrons inside. When the P-type semiconductor and the N-type semiconductor are connected, a P-N junction is formed between the P-type semiconductor and the N-type semiconductor. When an electric field is applied between the P-type semiconductor and the N-type semiconductor, electrons in the N-type semiconductor are pushed to the P-type semiconductor, recombined with the holes in the P-type semiconductor, and release energy in the form of photon.
Implementation Method 2
The sub-pixel unit includes an LED unit and a filter layer transmitting light of a specific color
Data Source
AI summary
A full-color display panel includes a plurality of sub-pixel units. The sub-pixel unit includes an LED unit and a filter layer transmitting light of a specific color. The LED unit includes an LED semiconductor chip emitting light of a specific color. The LED semiconductor chips of the plurality of sub-pixel units are homochromatic LED semiconductor chips emitting light of a same color. In each sub-pixel unit, a position of the filter layer corresponds to a position of the LED semiconductor chip, and the filter layer is located on a side of the LED semiconductor chip that emits light.