OLED Display Black Matrix Lens Configuration for Reflection Control
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Solution Overview
Problem
Organic light-emitting diode (OLED) display devices face issues with high external light reflection, which reduces contrast ratio and image quality, and the use of polarizing plates to mitigate this increases costs and reduces internal light transmission.
Innovation Solution
The OLED display device incorporates a lens and black matrix configuration with a translucent overcoat layer and color filter to limit the viewing angle, allowing for improved luminance without the need for a polarizing plate, by optimizing the width and placement of black matrices and lenses to control light refraction and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing plate is applied to prevent external light reflection, then the contrast ratio is improved, but the luminance is decreased and manufacturing costs increase
Solution Approach 1:
The device is divided into three distinct black matrix layers (first, second, and third black matrices) with different widths and positions, each serving specific functions in blocking external light from different angles. This segmentation allows selective blocking of reflected light while preserving forward-emitted light, thereby improving contrast ratio without sacrificing luminance.
Solution Approach 2:
Different regions of the display device have different black matrix configurations. The first black matrix has a first width, the second black matrix has a second width, and the third black matrix has a third width, creating localized light blocking properties that optimize both contrast and luminance in different areas of the display.
2Object-affected harmful factors
If a polarizing plate is applied to prevent external light reflection, then the contrast ratio is improved, but manufacturing costs increase
Solution Approach 1:
The patent extracts and eliminates the polarizing plate from the display device structure, replacing it with a multi-layer black matrix system. This removal of the expensive polarizing plate component directly reduces manufacturing costs while the black matrix layers provide the necessary light reflection control functions.
Solution Approach 2:
The black matrix layers are made from cost-effective materials and can be manufactured using standard fabrication processes, providing a cheaper alternative to polarizing plates. The black matrices serve their light-blocking function effectively without requiring the complex multi-film structure of polarizing plates.
3Illumination intensity
If the viewing angle is limited using lens and black matrix configuration, then the luminance is improved, but the device complexity increases
Solution Approach 1:
The patent merges the light-blocking and viewing angle control functions into a single integrated black matrix system that works in conjunction with the lens. The multiple black matrix layers are positioned at different locations (first over the lens, second between lens and color filter, third between color filter and cover window) to collectively control light paths and enhance luminance while maintaining a relatively simple overall structure.
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 enhances luminance while reducing costs by eliminating the polarizing plate and minimizing external light reflection, thereby improving image quality and reducing manufacturing expenses.
Implementation Method 1
a lens over the first black matrix and corresponding to the sub-pixel
Implementation Method 2
The first black matrix over the display panel; a second black matrix between the first black matrix and the color filter layer
Data Source
AI summary
An organic light-emitting diode display device includes a display panel including a first electrode, a light-emitting layer, and a second electrode provided at each sub-pixel; a first black matrix over the display panel; a lens over the first black matrix and corresponding to the sub-pixel; a translucent overcoat layer over the lens; a color filter layer over the translucent overcoat layer; a second black matrix between the first black matrix and the color filter layer; and a cover window over the color filter layer, wherein a width of the first black matrix is larger than a width of the second black matrix in a first direction.