OLED Substrate Reflectance Reduction via Segmented Color Filters
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices face increased power consumption and reduced light efficiency when not using a circular polarizer, as they struggle to minimize reflectance without compromising luminance.
Innovation Solution
A thin film transistor array substrate and OLED display device configuration that includes a bank pattern and color filters on specific subpixels, with a color layer on the first substrate and a non-color filter area on the second substrate, allowing for reduced reflectance and enhanced light efficiency without a circular polarizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizing plate is used, then reflectance is reduced and appearance of black is improved, but transmittance is reduced and power consumption increases
Solution Approach 1:
The invention divides the subpixels into white subpixels and colored subpixels (R, G, B). Color filters are selectively applied only to the colored subpixels, while white subpixels remain without color filters. This segmentation allows the display to achieve low reflectance in colored areas without the need for a circular polarizer across the entire display, thereby maintaining high transmittance and low power consumption in the white subpixel areas.
Solution Approach 2:
Different optical properties are applied to different regions: colored subpixels have color filters to reduce reflectance, while white subpixels maintain high transmittance by omitting color filters. This local differentiation optimizes each region's performance - colored areas get reflectance reduction where needed, while white areas preserve light efficiency, eliminating the need for a circular polarizer that would degrade overall transmittance.
2Object-affected harmful factors
If a color filter is disposed in a white subpixel area to reduce reflectance, then reflectance is reduced, but light emitted from the organic light emitting element is absorbed and light efficiency deteriorates
Solution Approach 1:
The invention segments the subpixels into white subpixels and colored subpixels, applying color filters only to the colored subpixels. This prevents color filters from being placed in white subpixel areas where they would absorb emitted light. The segmentation ensures that white subpixels maintain high light efficiency while colored subpixels achieve reflectance reduction through selective color filtering.
Solution Approach 2:
Color filters are applied locally only where needed - in the colored subpixel areas (R, G, B) - and not in the white subpixel areas. This local application of color filters reduces reflectance in the colored regions without causing light absorption losses in the white regions, thereby maintaining overall light efficiency while achieving the desired reflectance reduction.
3Use of energy by moving object
If no circular polarizing plate is used, then transmittance is improved and power consumption is reduced, but reflectance increases
Solution Approach 1:
The invention eliminates the need for a circular polarizer by segmenting the subpixels and applying color filters only to colored subpixels. This segmentation approach achieves reflectance reduction in the colored areas through the color filters themselves, while white subpixels maintain high transmittance without requiring a circular polarizer, thereby reducing overall power consumption.
Solution Approach 2:
Reflectance reduction is achieved locally in colored subpixels through color filters, while white subpixels maintain their natural high transmittance properties. This local quality differentiation eliminates the need for a circular polarizer that would be required if the entire display surface needed reflectance reduction, thereby preserving overall transmittance and reducing power consumption.
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 effectively lowers external light reflectance, increases luminance efficiency, and reduces power consumption in OLED display devices, while simplifying the fabrication process.
Implementation Method 1
the organic light emitting diode display device uses a self light emitting element, in other words a self-luminous element
Implementation Method 2
a color filter is disposed in a white subpixel area in order to reduce reflectance of the organic light emitting diode display device, but in this case light emitted from the organic light emitting element will be absorbed in the color filter
Data Source
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AI summary
A thin film transistor array substrate and an organic light emitting diode display device including the same. In the thin film transistor array substrate and the organic light emitting diode display device including the same of the present invention, a color layer is disposed on a first substrate corresponding to a white subpixel and a non color filter area is included in a second substrate corresponding to the white subpixel, and thus, it is possible to lower reflectance of external light, increase luminance efficiency of the organic light emitting element, and reduce power consumption of the organic light emitting diode display device