Self-illumination Display Pixel Unit Structure for Low Reflection
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Solution Overview
Problem
Self-illumination displays face challenges in reducing external light reflection, which affects contrast and illumination efficiency, as existing solutions like polarizing films either reduce reflection but decrease illumination or increase contrast but shorten the lifespan of illumination elements.
Innovation Solution
A pixel unit structure incorporating a light-absorbing structure, a filter layer, and a black electrode layer is used, where the light-absorbing structure reduces external light entry into non-illuminative regions, the filter layer further isolates external light, and the black electrode layer minimizes reflection, enhancing contrast and illumination efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing film with low transmitting rate is used to reduce reflection, then the reflective rate is reduced and contrast is enhanced, but the illumination is lost and the illuminative rate of the self-illumination element must be increased which reduces its lifetime
Solution Approach 1:
The display structure is segmented into multiple functional layers: a first polarizing film for initial reflection reduction, a light-absorbing structure to capture stray light and prevent internal reflection, and a second polarizing film for additional reflection control. This segmentation allows each layer to perform its specific function efficiently, reducing the need for high illuminative rates and extending element lifetime
Solution Approach 2:
The light-absorbing structure acts as an intermediary between the polarizing films and the internal components (electrodes, transistors). It absorbs stray light and prevents it from reflecting off internal components back to the display surface, thereby reducing overall reflection without requiring the polarizing films to work at maximum capacity, which preserves illumination efficiency and extends element lifetime
2Use of energy by moving object
If a polarizing film with high transmitting rate is used, then the utilizing rate of light is better, but the efficiency of contrast is decreased
Solution Approach 1:
The use of multiple polarizing films with different transmitting rates allows the system to optimize both light utilization and contrast. The first polarizing film can be configured for higher transmission to maintain illumination efficiency, while the second polarizing film and light-absorbing structure provide additional reflection control to maintain contrast performance
Solution Approach 2:
The combination of polarizing films with a light-absorbing structure creates a composite optical system. This composite structure allows the system to achieve both high light transmission (through the polarizing films) and effective reflection control (through the light-absorbing structure), thereby simultaneously improving light utilization rate and contrast efficiency
3Object-affected harmful factors
If the illumination of the self-illumination unit is increased to enhance contrast, then the contrast performance is improved, but the lifetime of the self-illumination element is reduced
Solution Approach 1:
The light-absorbing structure converts harmful stray light and reflections into beneficial effects by absorbing them before they can degrade image quality. This allows the display to achieve high contrast performance without needing to overdrive the self-illumination elements, thereby extending their operational lifetime while maintaining superior contrast
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 solution effectively reduces external light reflection, improving contrast and illumination efficiency while extending the lifespan of self-illumination elements by isolating driving circuits and using a black electrode layer with lower reflectivity than common metal electrodes.
Implementation Method 1
The light-absorbing structure is formed over the first substrate and disposed within the non-illuminative region. By the installation of the light-absorbing structure, the amount of the external environment light to the non-illuminative region of the first substrate is reduced.
Implementation Method 2
The filter layer is disposed over the first substrate and close to the light-absorbing structure. Because of the isolation of the filter layer, the amount of the external environment light emitted into the first substrate is reduced and the contrast of the image shown on the self-illumination display is enhanced.
Implementation Method 3
The self-illumination unit includes a light-transmissible electrode layer, a light emitting layer and a black electrode layer. Because the reflection of the black electrode layer is lower than the common metal electrode, the reflective light generated by the black electrode layer is lower than the reflective light generated by the common metal electrode
Data Source
AI summary
A self-illumination display is provided, including a first substrate, a light-absorbing structure, a filter layer, a driving circuit unit, and a self-illumination unit. The light-absorbing structure and the filter layer are juxtaposedly disposed over the first substrate. The driving circuit unit is disposed over and shielded by the light-absorbing structure. The self-illumination unit is disposed over the filter layer, including a light-transmissible electrode, a light emitting layer, and a black electrode. The self-illumination unit is disposed over the filter layer, including a light-transmissible electrode, a light emitting layer, and a black electrode. The light-transmissible electrode is disposed over the filter layer while the light emitting layer and the black electrode are sequentially tiered on the light-transmissible electrode. The light-absorbing structure, the filter layer and the black electrode together reduce the reflection of the ambient light and enhance the image contrast.