Display Device Neutral Black Reflection Color Control
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Solution Overview
Problem
Current display devices struggle to achieve a neutral black reflection color, which is essential for improved color accuracy and viewing angles, especially in self-luminous display technologies like OLEDs.
Innovation Solution
The implementation of a display device structure that includes specific emission areas, wavelength conversion patterns, and color filters, where the reflectance ratios of different color components are carefully managed to achieve a neutral black reflection color, with the use of a light-transmitting pattern and color filters on substrates to control the reflection of light within specific wavelength ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional display device structures are used, then manufacturing and operation are straightforward, but neutral black reflection color cannot be achieved
Solution Approach 1:
The display device is segmented into distinct functional regions: first emission area with first color filter, second emission area with second color filter, and third emission area with third color filter. Each region is independently configured with specific reflectance ratios to collectively achieve neutral black reflection color across the entire display
Solution Approach 2:
Different regions of the display are assigned different local optical properties: the first emission area has reflectance ratio of 5.3-9.2% for blue light, the second emission area has 67.6-73.6% for green light, and the third emission area has 18.3-24.7% for red light. This local differentiation enables overall neutral black reflection color
2Measurement precision
If color filters with appropriate thicknesses are used, then color accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise thickness parameters for each color filter: first color filter thickness of 50-150 nm, second color filter thickness of 20-80 nm, and third color filter thickness of 20-80 nm. By controlling these physical parameters within defined ranges, the reflectance ratios are maintained within target ranges, achieving neutral black reflection color with color difference ΔEab of 3 or less
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 approach allows for a neutral black reflection color with a color difference of 3 or less, enhancing color accuracy and visibility at various viewing angles, thereby improving the overall display performance.
Implementation Method 1
a first wavelength conversion pattern overlapping the first emission area; a second wavelength conversion pattern overlapping the second emission area
Implementation Method 2
a first color filter on the first wavelength conversion pattern; a second color filter on the second wavelength conversion pattern; and a third color filter on the light-transmitting pattern
Implementation Method 3
reflected light caused by a measurement light source emitted to the substrate includes light of a first color having a wavelength ranging from 380 nm to 500 nm, light of a second color having a wavelength ranging from 500 nm to 600 nm, and light of a third color having a wavelength ranging from 600 nm to 780 nm
Data Source
AI summary
A display device includes a first substrate including a first emission area, a second emission area, and a third emission area, each of which is to emit a first light; a second substrate having a first surface facing the first substrate and a second surface opposite to the first surface; a first color filter, a second color filter and a third color filter, and a first wavelength conversion pattern, a second wavelength conversion pattern and a light-transmitting pattern on the first surface of the second substrate. A thickness of the first color filter is greater than a thickness of the second color filter and the thickness of the second color filter is greater than a thickness of the third color filter.