Under-Panel Display Subpixel Layout for Light-Blocked Sensor Areas
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Solution Overview
Problem
Display devices face challenges in maintaining uniform luminance due to light interference from sensor devices, which affects the performance of transistors in subpixels, particularly in areas where sensor devices overlap with the display panel.
Innovation Solution
Incorporating a light-blocking layer between the substrate and the active layer in subpixels, along with a metal layer in specific configurations, to block light incident on transistors and maintain compensated values across different subpixel areas, ensuring uniform luminance and improved transistor characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensor devices are installed overlapping the display panel to increase display area, then the display area is increased, but light from sensor devices interferes with transistor performance in subpixels
Solution Approach 1:
A light-blocking layer is introduced as an intermediary component between the sensor device and the subpixel transistors. This layer selectively blocks harmful light from reaching the transistor channels while allowing necessary electrical signals to pass through, thereby resolving the contradiction between maintaining display area and preventing light interference.
Solution Approach 2:
The solution adds a new dimension (depth layer) to the display structure by inserting the light-blocking layer in the vertical stack between the sensor and the active layer. This dimensional addition allows light blocking without reducing the planar display area, effectively separating the optical and electrical functional layers.
2Reliability
If a light-blocking layer is added to block light interference, then transistor characteristics are improved, but device structure becomes more complex
Solution Approach 1:
The light-blocking layer is designed to serve multiple functions simultaneously: it blocks light from reaching the transistor channel, provides electrical connection pathways for signal transmission, and maintains structural integrity of the overlapping region. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Area of stationary object
If sensor devices overlap subpixels, then display area increases, but luminance uniformity deteriorates due to light interference
Solution Approach 1:
The light-blocking layer is selectively applied only in the regions where sensor devices overlap with subpixels, rather than uniformly across the entire display. This localized approach blocks light interference precisely where it occurs while leaving other regions unchanged, thereby maintaining luminance uniformity without unnecessarily increasing device complexity.
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 blocks light interference, enhancing turn-on characteristics, threshold-voltage characteristics, and subthreshold swing of transistors, thereby maintaining uniform luminance across the display panel by matching compensated values of first and second subpixels.
Implementation Method 1
a light-blocking layer disposed between the substrate and the first active layer and overlapping the second active layer in a thickness direction
Data Source
AI summary
A display device includes a display panel having a general area including first subpixels, and a sensor area including second subpixels and light-transmitting area. Each of the first subpixels and the second subpixels includes a first active layer disposed on a substrate and formed of a first material, a first gate layer disposed on the first active layer, a second gate layer disposed on the first gate layer, a second active layer disposed on the second gate layer and formed of a second material different from the first material, a third gate layer disposed on the second active layer, and a light-blocking layer disposed between the substrate and the first active layer and overlapping the second active layer in a thickness direction.