OLED Color Filter Panel Design for Luminance and Stability
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Solution Overview
Problem
The color filter type method for OLED displays results in lower luminance due to light attenuation through color filters and reduced opening ratio, especially in bottom emission types, which affects display quality and manufacturing stability.
Innovation Solution
A color filter panel design where the pixel electrode is formed directly on the color filter, and the color filters overlap with data and power supply lines, reducing electrical coupling and eliminating the need for additional light-blocking layers, thereby increasing the opening ratio and enhancing luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If color filters are disposed between the light emitting layer and substrate in a bottom emission type OLED apparatus, then manufacturing stability and encapsulation stability are improved, but opening ratio is reduced which lowers luminance
Solution Approach 1:
The patent moves the color filter from the traditional position between the light emitting layer and substrate to a position overlapping with the data line and power supply line. This spatial repositioning in a different dimension allows the color filter to serve dual purposes: maintaining manufacturing stability while increasing the opening ratio by not occupying pixel area, thereby resolving the contradiction between reliability and luminance.
2Reliability
If color filters are disposed between the light emitting layer and substrate, then manufacturing stability is improved, but degree of freedom of manufacturing process is reduced
Solution Approach 1:
The color filter is designed to perform multiple functions simultaneously: it serves as both a color filtering element and a light-blocking layer for the data line and power supply line. This multi-functionality increases the degree of freedom in manufacturing process design, as the same structure achieves multiple objectives without requiring additional separate components.
3Illumination intensity
If the RGB light independently emitting type method is used, then luminance is improved, but manufacturing complexity increases compared to color filter type method
Solution Approach 1:
The patent combines the functions of the color filter and the light-blocking layer into a single integrated structure. By merging these two separate components into one, the manufacturing process is simplified while maintaining the luminance benefits of the RGB light independently emitting type method, thus resolving the contradiction between luminance and manufacturing complexity.
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 enhances light utilization efficiency and luminance by maximizing the opening ratio and minimizing parasitic capacitance, leading to improved display quality and manufacturing simplicity.
Implementation Method 1
minimizing parasitic capacitance
Implementation Method 2
The above-described mechanism is commonly referred to as 'electro-luminescence.'
Implementation Method 3
Fluorescence corresponds to a transition from a singlet state to a ground state
Implementation Method 4
phosphorescence corresponds to a transition from a triplet state to a ground state
Data Source
AI summary
An OLED apparatus includes a substrate, a TFT, a scan line, a data line, a power supply line, a color filter, a pixel electrode, a light emitting layer and a counter electrode. The TFT is formed on the substrate. The scan line transmits a scan signal to a control electrode of the TFT. The data line transmits a data signal to the TFT. Bias voltages are applied to the TFT through the power supply line. The color filter overlaps with one or more of the scan line, the data line and the power supply line. The pixel electrode overlaps with one or more of the scan line, the data line and the power supply line. The light-emitting layer is formed on the pixel electrode. The counter electrode is formed on the light-emitting layer. Therefore, cross talk may be reduced and the opening ratio increased to enhance luminance.