Common Pixel Circuit Topology for Fine-Pitch HMD Displays
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Solution Overview
Problem
Existing display devices, particularly head-mounted displays (HMDs), face challenges in achieving high-resolution images due to the need for fine pixels, which are not adequately addressed by current technologies.
Innovation Solution
A display device design that includes a display panel with pixels sharing a common circuit, reducing the number of transistors per pixel by utilizing a common circuit connected to a node between the light-emitting element and the driving transistor, and incorporating specific transistor operations during initialization, threshold voltage detection, data write, and emission periods to enhance pixel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple transistors are disposed in each pixel to achieve high-resolution display, then the resolution is improved, but the pixel size increases and fine pixels cannot be implemented
Solution Approach 1:
The patent merges the initialization transistor from individual pixel circuits into a shared common circuit that serves multiple pixels. This consolidation reduces the transistor count per pixel while maintaining the necessary initialization function, thereby reducing pixel size and enabling fine pixel implementation while preserving display resolution
Solution Approach 2:
The common circuit is designed to perform initialization functions for multiple pixels simultaneously, making it a multi-functional component. This universal approach allows a single circuit to serve multiple purposes across different pixels, reducing overall circuit complexity and pixel area while maintaining high-resolution capability
2Area of moving object
If the number of transistors per pixel is reduced to achieve fine pixels, then the pixel size is reduced, but the display resolution and image quality may deteriorate
Solution Approach 1:
The patent segments the initialization function from individual pixel circuits and places it in a separate common circuit. This segmentation allows the pixel circuit to be minimized for fine pixel implementation while the common circuit handles the initialization tasks, ensuring that resolution is maintained despite reduced per-pixel transistor count
Solution Approach 2:
The common circuit acts as an intermediary that provides initialization signals to multiple pixels through shared pathways. This mediator approach enables reduced pixel size while maintaining proper initialization and control functions necessary for high-resolution display performance
Data Source
AI summary
According to an embodiment of the disclosure, a display device includes a display panel having a display area and a non-display area; a plurality of pixels disposed in the display area; a light-emitting element disposed in each of the plurality of pixels; a driving transistor disposed in each of the plurality of pixels and electrically connected to the light-emitting element; and a common circuit disposed in the non-display area and electrically connected to a node between the light-emitting element and the driving transistor.