Under-Display Sensing Layout With Local Light Blocking
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Solution Overview
Problem
Existing display devices face challenges in minimizing image quality degradation due to the impact of sensing module light, particularly infrared light, on pixel transistor characteristics, leading to leakage currents and reduced sensing accuracy.
Innovation Solution
Incorporating a first layer that overlaps and blocks light from the sensing module in specific pixel areas, while maintaining high transmittance in transmission areas, to prevent changes in transistor characteristics and enhance sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensing module is added to the display device, then sensing function is provided, but image quality degradation occurs due to light impact on transistors
Solution Approach 1:
The display panel is divided into a first region (display area) and a second region (sensing area). The sensing module is positioned in the second region, separating the sensing function from the display function. This segmentation prevents the sensing module light from affecting the entire display area, limiting its impact only to the second region where sensing occurs.
Solution Approach 2:
A first layer is selectively positioned in the second region between the sensing module and the transistors, creating local light blocking only where needed. The first layer has a specific shape that covers the transistor area while leaving other regions unaffected. This local quality approach blocks harmful light precisely where it would cause damage without interfering with the overall sensing function or display quality in other areas.
2Reliability
If light blocking layer is added to protect transistors, then transistor characteristics are maintained, but sensing accuracy may be reduced
Solution Approach 1:
The first layer is designed with a specific shape and position that provides local light blocking only in the transistor area of the second region. This selective positioning ensures that light blocking occurs precisely where needed to protect transistor characteristics, while minimizing interference with the sensing light path. The local quality approach optimizes the balance between protecting transistors and maintaining sensing accuracy by avoiding excessive or misplaced light blocking.
Solution Approach 2:
The first layer acts as an intermediary element positioned between the sensing module and the transistors. It mediates the interaction between sensing light and transistor structures, allowing the sensing function to operate while preventing harmful light from directly impacting the transistors. The intermediary layer filters and manages light transmission in a controlled manner.
3Reliability
If first layer covers entire pixel area, then all transistors are protected, but display quality and light transmittance are reduced
Solution Approach 1:
The first layer is designed with a specific shape that provides localized coverage only over the transistor areas in the second region, rather than covering the entire pixel area or first region. This selective positioning protects transistors from light exposure while maintaining high light transmittance in the display area (first region) and non-transistor areas. The local quality approach ensures that display quality and brightness are not compromised by unnecessary light blocking in regions where transistors are absent.
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
The solution effectively reduces image quality degradation and improves sensing accuracy by blocking sensing module light, ensuring excellent display quality and recognition rates.
Implementation Method 1
a first layer that blocks light output by the sensing module
Implementation Method 2
a transmission area to transmit light output by the sensing module
Data Source
AI summary
A display device includes a display panel including a first region and a second region, and a sensing module on a rear side of the display panel. The first region includes a first pixel area to display an image. The second region includes a second pixel area to display the image and a transmission area to transmit light output by the sensing module. The second region overlaps the sensing module. The second pixel area overlaps a first layer that blocks light output by the sensing module. The transmission area does not overlap the first layer.