Display Panel Inter-Subpixel Photosensor Aperture Ratio
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Solution Overview
Problem
Conventional fingerprint recognition display panels have a reduced aperture ratio due to the placement of photosensors and other components in subpixel regions, which affects their performance.
Innovation Solution
A display panel design that includes a light filtering layer in the inter-subpixel region with a photosensor sensitive to a specific wavelength of light, such as infrared or ultraviolet, coupled with a thin film transistor, allowing for increased aperture ratio and effective fingerprint or palmprint detection without compromising display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photosensor and associated components are disposed in subpixel regions, then fingerprint recognition function is achieved, but aperture ratio of display panel is decreased
Solution Approach 1:
The patent divides the pixel structure into subpixel regions and inter-subpixel regions, placing photosensors only in the inter-subpixel regions. This segmentation allows the display area (subpixel regions) to remain fully functional while dedicating specific non-display areas (inter-subpixel regions) to sensing functions, thereby maintaining high aperture ratio while achieving fingerprint recognition.
Solution Approach 2:
The patent utilizes the inter-subpixel regions, which are normally wasted space between functional subpixels, to house the photosensors. By exploiting this previously unused dimensional space, the design adds fingerprint sensing capability without encroaching on the light-emitting subpixel areas, thus preserving aperture ratio.
2Area of stationary object
If photosensor is placed in inter-subpixel region with light filtering layer, then aperture ratio is increased, but detection accuracy may be affected
Solution Approach 1:
The patent applies a light filtering layer with specific wavelength selectivity (transmissive to infrared or ultraviolet light) only in the inter-subpixel region where the photosensor is located. This local quality enhancement ensures that the photosensor receives only the desired wavelength range for accurate fingerprint detection, while the subpixel regions maintain their full-color display properties, thus achieving both high aperture ratio and accurate detection.
Solution Approach 2:
The patent changes the wavelength parameter of light detection by using a light filtering layer that selectively transmits infrared or ultraviolet wavelengths. This parameter change allows the photosensor to detect fingerprint patterns based on wavelength-specific light interactions, improving detection accuracy despite the photosensor's location in the inter-subpixel 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
The solution enhances the aperture ratio of the display panel while enabling accurate biometric detection by utilizing a photosensor in the light filtering region to differentiate ridge lines from valley lines based on light wavelength changes, improving detection accuracy without affecting the display's performance.
Implementation Method 1
a light filtering layer forming a light filtering region within the inter-subpixel region, the light filtering layer comprising a light filtering Material at least partially transmissive for a light of a selected wavelength
Implementation Method 2
a photosensor in the light filtering region for detecting the light of the selected wavelength, the photosensor being sensitive to the light of the selected wavelength
Implementation Method 3
a photoelectric conversion layer on a side of the transparent electrode layer distal to the light emitting surface of the display panel, wherein a resistance of the photoelectric conversion layer undergoes a change when the photoelectric conversion layer is irradiated by the light of the selected wavelength
Implementation Method 4
the light guide being capable of reflecting the light of the selected wavelength by total reflection
Data Source
AI summary
A display panel having a plurality of pixels, each of which includes a subpixel region and an inter-subpixel region. The display panel includes a light filtering layer forming a light filtering region within the inter-subpixel region, the light filtering layer comprising a light filtering material at least partially transmissive for a light of a selected wavelength; and a photosensor in the light filtering region for detecting the light of the selected wavelength, the photosensor being sensitive to the light of the selected wavelength.