Under-Screen Pixel Driver Circuit for Higher Optical Transmittance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display technologies face challenges in improving the transmittance of optical elements in under-screen display panels, particularly when using low-temperature poly-silicon transistors, which hinder the screen-to-body ratio and photosensitive performance.
Innovation Solution
Employing low-temperature polycrystalline oxide thin-film transistors in the pixel driver circuit of the second display region to enhance transmittance and photosensitive performance, combined with a simplified pixel driver circuit design using transistors like LTPO for compensation and reset functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If low-temperature poly-silicon transistors are used in the pixel driver circuit, then the transistor performance and switching speed are improved, but the transmittance of the optical element region deteriorates
Solution Approach 1:
The patent changes the material parameter of the transistor from low-temperature poly-silicon to low-temperature polycrystalline oxide semiconductor, which fundamentally alters the electrical and optical properties. This material substitution maintains adequate switching performance while dramatically improving light transmittance in the optical element region, resolving the contradiction between speed and transmittance.
2Area of stationary object
If the screen-to-body ratio is increased by using under-screen display design, then the display area is improved, but the transmittance of the optical element region deteriorates
Solution Approach 1:
The patent applies local quality by using different transistor materials in different regions: low-temperature polycrystalline oxide semiconductor transistors are specifically used in the optical element region (second display region) to maximize transmittance, while other regions can use different transistor types optimized for their specific functions. This localized material optimization allows the under-screen display design to achieve both high display area and high transmittance where needed.
Data Source
AI summary
A display panel includes a first display region and a second display region, the first display region and the second display region each include multiple subpixels which are arranged in an array, and each subpixel includes a pixel driver circuit. The second display region corresponds to a photosensitive element. Each pixel driver circuit located in the second display region includes at least one transistor, and at least one transistor of the at least one transistor is a low-temperature polycrystalline oxide thin-film transistor.