Under-Display Camera Pixel Circuit Layout for Higher Transmittance
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Solution Overview
Problem
Electronic devices with under-display cameras face challenges in increasing transmittance and reducing luminance and lifespan differences between pixels in the UDC area and normal areas, leading to visibility issues due to decreased pixel density and luminance variations.
Innovation Solution
The electronic device employs a structure with first and second pixels in the UDC and normal areas, respectively, featuring distinct driving TFTs with different channel widths and lengths, and extends pixel components into the wiring area to enhance transmittance and reduce visibility of the UDC area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the arrangement density of pixels in the UDC area is decreased to increase transmittance, then the amount of light introduced into the camera is increased, but a luminance difference occurs between the UDC area and normal areas
Solution Approach 1:
The patent applies local quality by differentiating pixel structures between UDC area and normal areas. First pixels in the UDC area have a different internal structure compared to second pixels in normal areas, allowing optimized light transmission characteristics specifically in the camera overlay region while maintaining overall display uniformity
Solution Approach 2:
The patent changes physical parameters of the pixel structure, specifically the channel width and channel length of driving TFTs, to adjust the electrical characteristics and light emission properties of pixels in the UDC area, thereby compensating for transmittance differences and reducing luminance variation across the display
2Illumination intensity
If the arrangement density of pixels in the UDC area is decreased to increase transmittance, then light transmission is improved, but the UDC area becomes visible to users due to reduced pixel density
Solution Approach 1:
The patent implements local quality by creating distinct pixel configurations for different display regions. The first pixels in the UDC area utilize a different driving TFT structure with modified channel dimensions, enabling them to maintain appropriate visual density characteristics while still allowing enhanced light transmission for camera operation
3Illumination intensity
If different pixel structures are used in UDC area and normal areas, then transmittance in the UDC area is increased, but a lifespan difference occurs between first pixels and second pixels
Solution Approach 1:
The patent adjusts the electrical parameters of the driving TFTs by modifying channel width and channel length to balance the operational stress and lifetime characteristics of pixels in different regions, ensuring that first pixels in the UDC area and second pixels in normal areas have comparable operational lifespans despite structural differences
Data Source
AI summary
Various embodiments of the disclosure relate to an electronic device including an under display camera (UDC). The electronic device includes: a housing, a display, and a camera disposed inside the housing overlapping a portion of the display and acquiring light passing through the display from outside. The display includes a first area in which a first pixel overlapping with at least a portion of the camera and a first pixel driving circuit for driving the first pixel are disposed, and a second area, other than the first area, in which a second pixel and a second pixel driving circuit for driving the second pixel are disposed. The first pixel driving circuit includes a first driving thin film transistor (TFT) having a first channel region having a straight shape does not include a curved shape, and the second pixel driving circuit includes a second driving TFT having a second channel region of a curved shape. A first channel width of the first driving TFT is greater than a second channel width of the second driving TFT, and a first channel length of the first driving TFT is less than a second channel length of the second driving TFT.