WOLED Display Control for Large-Area Substrate Patterning
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Solution Overview
Problem
Conventional fine metal mask (FMM) deposition methods for OLED devices face challenges in accurately patterning light emitting layers on large substrates, leading to reduced yield and difficulty in producing high-precision large-area displays.
Innovation Solution
A method for controlling image display in WOLED devices that converts grayscale data into brightness data, adjusts brightness values for white and color sub-pixels based on their proportions, and uses gamma curves to optimize light emission, allowing for accurate color reproduction without the need for fine metal masks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional FMM deposition method is used for large substrates, then light emitting layers can be deposited, but manufacturing precision deteriorates due to mask curvature making accurate patterning difficult
Solution Approach 1:
The patent extracts and removes the fine metal mask (FMM) component from the deposition system. By using a white OLED structure with color filters instead of individual red, green, and blue light emitting layers requiring FMM patterning, the mask is completely eliminated from the manufacturing process, thereby resolving the patterning precision issue while maintaining large substrate area capability
Solution Approach 2:
The white OLED layer serves multiple functions: it provides the white light source that subsequently passes through color filters to produce red, green, and blue sub-pixels. This single layer replaces what would traditionally require three separately patterned light emitting layers, enabling large area deposition without FMM while maintaining color display capability
2Area of stationary object
If FMM method is used for large area substrates, then deposition can be performed, but productivity deteriorates due to reduced yield from patterning difficulties
Solution Approach 1:
By removing the FMM step entirely from the process, the patent eliminates the source of patterning failures that reduce yield. The white OLED approach with subsequent color filtering allows large area deposition without the precision constraints of FMM, thereby improving production yield for large substrates
Solution Approach 2:
The patent segments the color generation process into two independent stages: first depositing the white OLED light emitting layer uniformly across the entire substrate, then separately applying color filters to individual pixel regions. This segmentation allows the deposition step to focus on uniform large-area coverage rather than precise spatial patterning, improving yield
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 method enhances the precision and efficiency of WOLED display technology by ensuring accurate color representation and brightness adjustment, reducing power consumption, and eliminating color cast, while enabling the production of large-area displays with improved yield.
Implementation Method 1
The organic light emitting diode devices achieve image display by controlling current flowing in the organic light emitting diodes (OLED)
Implementation Method 2
The R sub-pixel includes an R color filter configured to transmit a red light in a white light from the white OLED. The G sub-pixel includes a G color filter configured to transmit a green light in a white light from the white OLED. The B sub-pixel includes a B color filter configured to transmit a blue light in a white light from the white OLED
Data Source
AI summary
The present disclosure provides a method and an apparatus for controlling image display of a WOLED display apparatus and a WOLED display apparatus. The method includes: converting gray scale data of respective lights with various colors inputted by a signal source into brightness data of the respective lights with various colors; acquiring brightness adjustment data of white sub-pixel lights and brightness adjustment data of the respective lights with various colors on the basis of the brightness data of the respective lights with various colors and proportions of the respective lights with various colors in the white sub-pixel lights; converting the brightness adjustment data of white sub-pixel lights and brightness adjustment data of the respective lights with various colors into gray scale data and outputting and displaying the gray scale data. The above method and apparatus provides a simple calculating method when adjusting the display data and may eliminate color cast.