Sensor-Area Subpixel Structure for Uniform Luminance in Displays
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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 overlapping specific transistors, to block light and improve transistor characteristics, thereby maintaining uniform luminance across the display panel.
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:
The patent segments the display panel into a general area with first subpixels and a sensor area with second subpixels. This segmentation allows different structures to be applied to different regions, with the sensor area subpixels including additional light-blocking layers to prevent light interference from sensor devices while maintaining the display function.
Solution Approach 2:
The patent introduces a light-blocking layer as an intermediary element between the sensor devices and the transistors in the second subpixels. This light-blocking layer specifically prevents light from sensor devices from reaching the transistors, thereby protecting transistor performance while allowing the sensor devices to function and the display area to be maximized.
2Reliability
If a light-blocking layer is added to block light from sensor devices, then transistor characteristics are improved, but device complexity increases
Solution Approach 1:
The patent applies the light-blocking layer locally only to the second subpixels in the sensor area, not to all subpixels throughout the display panel. This localized application prevents light interference where it is actually needed (in the sensor area) while avoiding unnecessary complexity in the general area, thus improving transistor characteristics only where required without uniformly 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 light-blocking layer and metal layer configuration effectively block light, enhancing turn-on characteristics, threshold-voltage characteristics, and subthreshold swing of transistors, ensuring uniform luminance and improved display performance by compensating for light interference from sensor devices.
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.