White Color Filter Transmittance for OELD Power and Contrast
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Solution Overview
Problem
Organic electroluminescent devices (OELDs) face challenges in reducing power consumption while maintaining or improving ambient contrast ratio, particularly due to limitations in using color filter patterns, especially without a white pixel, which affects power consumption and contrast ratio.
Innovation Solution
Incorporating a white color filter pattern with higher blue light transmittance than red and green light transmittance in the OELD, which emits bluish-white light, allowing for reduced power consumption and enhanced ambient contrast ratio by optimizing the color temperature and light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filter patterns are used to improve ambient contrast ratio, then ambient contrast ratio is improved, but power consumption increases
Solution Approach 1:
The patent applies different transmittance characteristics to different color regions within the color filter pattern. Specifically, the blue color filter pattern is designed with higher light transmittance compared to red and green color filter patterns, allowing the blue sub-pixel to contribute more to the overall display brightness and reduce the burden on other sub-pixels, thereby lowering power consumption while maintaining ambient contrast ratio.
2Use of energy by moving object
If white pixel is used to reduce power consumption, then power consumption is reduced, but ambient contrast ratio deteriorates due to lack of color filter pattern
Solution Approach 1:
The color filter pattern is designed to serve multiple functions simultaneously: it provides color filtering for ambient contrast ratio improvement while also optimizing light transmittance for power consumption reduction. The selective transmittance design allows the color filter pattern to fulfill both color discrimination and energy efficiency requirements without needing separate white pixel regions.
3Use of energy by moving object
If blue pixel transmittance is increased to reduce power consumption, then power consumption is reduced, but color accuracy may be affected
Solution Approach 1:
The patent optimizes the transmittance parameter of the blue color filter pattern within a specific range (higher than red and green but controlled to maintain color balance). By carefully adjusting this parameter, the system achieves the optimal balance between power consumption reduction and color accuracy maintenance, ensuring that the increased blue light contribution does not compromise overall color fidelity.
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 power consumption and improves ambient contrast ratio by using a white color filter pattern with increased blue light transmittance, providing a balance between power efficiency and contrast enhancement.
Implementation Method 1
An organic emitting layer of the OELD may include organic emitting materials for emitting red, green and blue colors. Alternatively, the organic emitting layer may include an organic emitting material for emitting a white light
Implementation Method 2
a color filter pattern which has a first transmittance with respect to a blue light and a second transmittance with respect to a red light or a green light, the first transmittance being greater than the second transmittance
Data Source
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AI summary
An organic electroluminescent device includes a first substrate including first to fourth pixel regions; an organic electroluminescent diode on the first substrate and in each of the first to fourth pixel regions, the organic electroluminescent diode emitting a white light; a second substrate facing the first substrate; and a color filter layer positioned between the organic electroluminescent diode and the second substrate or between the organic electroluminescent diode and the first substrate and including a red color filter pattern, a green color filter pattern, a blue color filter pattern and a white color filter pattern corresponding to the first to fourth pixel regions, respectively, wherein the white color filter pattern has a first transmittance with respect to a blue light greater than a second transmittance with respect to a red light and a green light.