Micro-lens Layer for Electroluminescence Display Brightness
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Solution Overview
Problem
Electroluminescent displays face challenges in maintaining consistent front luminance across different wavelengths and are susceptible to foreign material penetration, which affects their optical properties and reliability.
Innovation Solution
Incorporating a micro-lens layer between the upper substrate and the color filter layer, with optimized lens size and pitch for specific wavelengths, to enhance viewing angle and brightness while preventing moisture and gas intrusion through an additional encapsulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional electroluminescent display structure is used, then the display can operate, but the front luminance varies significantly across different wavelengths resulting in poor color gamut representation
Solution Approach 1:
The patent applies local quality by introducing a micro-lens layer with specific refractive index (1.7-1.9) positioned between the color filter and upper substrate. This localized optical structure selectively focuses specific wavelengths (e.g., 450-480nm for blue, 520-550nm for green, 620-650nm for red) to improve front luminance consistency across different color channels, thereby enhancing color gamut representation without affecting other display parameters.
2Ease of operation
If the color filter is positioned closer to the organic light emitting diode to improve viewing angle, then viewing angle property improves, but the gap reduction may cause manufacturing difficulties
Solution Approach 1:
The patent introduces a micro-lens layer as an intermediary component between the color filter and the upper substrate. This intermediate layer maintains an optimal gap distance (3μm-10μm) while still achieving the desired viewing angle improvement. The micro-lens structure allows light to be properly directed without requiring direct contact or extremely small gaps, thus facilitating easier manufacturing while achieving superior viewing angle properties.
3Device complexity
If the display structure is simplified to reduce manufacturing complexity, then manufacturing cost decreases, but protection against foreign materials such as moisture and gas is compromised
Solution Approach 1:
The patent designs the micro-lens layer to serve multiple functions simultaneously: (1) optical focusing to improve front luminance, (2) structural support to maintain gap distance, and (3) protective barrier against moisture and gas penetration. By combining these functions into a single integrated component, the overall device complexity is reduced while maintaining or even enhancing protection against foreign materials compared to separate protective layers.
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 improves front brightness for specific wavelengths, maintains superior viewing angles, and extends the display's lifespan by effectively sealing against foreign materials.
Implementation Method 1
a micro-lens layer disposed on the inner surface of the upper substrate... light of a specific wavelength passing through the color filter selectively reacts to the micro-lens
Data Source
AI summary
The present disclosure relates to an electroluminescence display having micro-lens layer. The electroluminescence display according to the present disclosure comprises: a lower substrate having a light emitting layer at middle portions; an upper substrate facing the upper substrate; a dam disposed at circumferences of the lower substrate and surrounding the light emitting layer; a filling layer filling space surrounded by the dam and covering the light emitting layer; a micro-lens layer disposed on the inner surface of the upper substrate; a color filter disposed as corresponding to the light emitting layer under the micro-lens layer; and a black matrix disposed at a side of the color filters under the micro-lens layer.