Under-Display Color Filter Thickness for Uniform Luminance
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Solution Overview
Problem
Existing electronic devices face challenges in achieving uniform luminance and lifespan across areas with and without electronic modules, particularly due to differences in transmittance and structural design.
Innovation Solution
The electronic device incorporates a display panel with varying thicknesses of color filter layers in different areas to enhance transmittance, including thinner color filter layers over electronic modules, ensuring uniform luminance and extended lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform thickness color filter layer is used across the entire display panel, then the manufacturing process is simple, but the luminance and lifespan are not uniform across areas with and without electronic modules
Solution Approach 1:
The color filter layer is designed with different thicknesses in different regions: a first thickness in the first area (over electronic modules) and a second thickness in the second area (without electronic modules). This local differentiation allows the area over electronic modules to have higher transmittance for improved sensor performance, while maintaining adequate filtering in other areas, thus achieving uniform luminance and lifespan across the display panel.
2Illumination intensity
If the color filter layer thickness is reduced in the area overlapping electronic modules, then light transmittance is improved, but the color filtering performance may be compromised
Solution Approach 1:
The color filter layer thickness is locally optimized: reduced in the first area over electronic modules to maximize light transmittance for sensor operation, and maintained at a greater thickness in the second area to ensure adequate color filtering performance for display quality where sensors are not located.
Solution Approach 2:
The thickness parameter of the color filter layer is changed spatially across the display panel. By varying this physical parameter based on location, the design achieves high transmittance where needed (over sensors) while maintaining color filtering performance in display areas, resolving the contradiction between these two requirements.
3Device complexity
If electronic modules are disposed under the display panel, then device integration is improved, but transmittance differences cause non-uniform luminance and lifespan
Solution Approach 1:
The color filter layer is designed with spatially varying thickness to compensate for the presence of electronic modules under the display. The thinner region directly over the modules provides enhanced transmittance for their operation, while the thicker surrounding regions maintain display quality, achieving both high integration and uniform luminance characteristics.
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 design improves light transmittance in areas overlapping electronic modules, leading to a uniform luminous lifespan across the display area, reducing bezel size, and enhancing overall device performance.
Implementation Method 1
A thickness of the first color filter layer may be smaller than a thickness of the second color filter layer... improves light transmittance in areas overlapping electronic modules
Data Source
AI summary
An electronic device includes a display panel including a first area including a light blocking area and a transmission area, a first pixel disposed in the first area, a second area adjacent to the first area, and a second pixel disposed in the second area, an input sensor disposed on the display panel, the input sensor including at least one insulating layer and a conductive layer, a black matrix disposed on the at least one insulating layer, a first color filter layer disposed on the at least one insulating layer, the first color filter overlapping the first pixel in a plan view, and a second color filter layer disposed on the at least one insulating layer, the second color filter overlapping the second pixel in a plan view. A thickness of the first color filter layer is smaller than a thickness of the second color filter layer.