Display Device Light-Shielding Layer Segmentation for MTF and Color
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Solution Overview
Problem
Liquid crystal display devices with built-in biosensors face degradation in Modulation Transfer Function (MTF) and luminance issues due to light-shielding layers blocking obliquely incident light, leading to undesired color impartation in the oblique field of view.
Innovation Solution
The implementation of a light-shielding member and light-shielding layer configuration, including a first and second opening structure, with a transparent organic insulating layer covering the light-shielding member, and a color filter arrangement to prevent light blocking and maintain display quality from various angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light-shielding layer is disposed on the upper layer of the optical sensor to suppress degradation in MTF, then the optical sensor's MTF is improved, but the luminance in the oblique field of view is degraded and undesired color is imparted to the display light
Solution Approach 1:
The light-shielding layer is segmented into multiple regions: a first light-shielding region disposed on the optical sensor to improve MTF, and a second light-shielding region disposed on pixels to prevent color degradation. This segmentation allows different parts of the light-shielding layer to serve different functions, resolving the contradiction between improving optical sensor performance and maintaining display quality in oblique viewing angles.
Solution Approach 2:
Different regions of the light-shielding layer are assigned different functions based on their local requirements. The first light-shielding region directly above the optical sensor focuses on improving MTF, while the second light-shielding region above the pixels focuses on preventing color degradation. This local differentiation allows each region to optimize its function without compromising the other.
2Measurement precision
If the light-shielding layer blocks obliquely incident light to improve optical sensor performance, then MTF is improved, but the display light in the oblique field of view is imparted with undesired color
Solution Approach 1:
The light-shielding layer is divided into functionally distinct regions: the first light-shielding region targets oblique light for MTF improvement, while the second light-shielding region targets oblique light to prevent color degradation. This segmentation enables the system to address both the harmful effect (color degradation) and the desired effect (MTF improvement) simultaneously through spatial differentiation.
Solution Approach 2:
The light-shielding layer, which initially causes color degradation by blocking oblique light, is redesigned with a second light-shielding region that converts this blocking action into a beneficial effect by preventing color degradation in the display region, while the first region maintains MTF improvement in the sensor region.
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 effectively suppresses the occurrence of undesired coloring in the display light when viewed from oblique angles without reducing the thickness of the organic insulating layer, ensuring accurate signal detection and display quality.
Implementation Method 1
a light-shielding layer as a collimator that blocks obliquely incident light is disposed on the upper layer of the optical sensor
Implementation Method 2
a transparent organic insulating layer covering the first light-shielding member
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate, and a liquid crystal layer, wherein the second substrate includes a first light-shielding member in a frame shape having a first opening overlapping an optical sensor, a light-shielding layer having a second opening overlapping the first opening, and a first pixel opening and a second pixel opening, the first light-shielding member has a first outer edge and a second outer edge elongated in a second direction, the first outer edge overlaps the light-shielding layer between the second opening and the first pixel opening in a planar view, and the second outer edge overlaps the light-shielding layer between the second opening and the second pixel opening in a planar view.