Pixel Layout Structure for High-Density Electroluminescent Displays
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Solution Overview
Problem
Current electroluminescent displays face limitations in increasing pixel density due to the inability to simultaneously place high-voltage and low-voltage devices in a limited subpixel layout area, constrained by process and design rules.
Innovation Solution
A pixel layout structure that includes a transition area with a second type of well contact, a high-voltage device area with a first type of high-voltage transistor and electroluminescent device, and a low-voltage device area with a second type of low-voltage transistor, where the high-voltage and low-voltage devices share a well contact and are separated by an insulating layer with a thickness gradient, allowing for the placement of both types of devices within a limited area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-voltage devices and low-voltage devices are placed in a limited subpixel layout area, then pixel density can be increased, but process and design rules prevent simultaneous placement of both device types
Solution Approach 1:
The pixel layout is segmented into distinct high-voltage device area and low-voltage device area, with a transition area between them. This segmentation allows each device type to be optimized independently while maintaining overall integration, resolving the contradiction between high pixel density and device compatibility.
Solution Approach 2:
A transition area is introduced as an intermediary zone between high-voltage and low-voltage device areas. This transition area contains specific well contacts that facilitate the coexistence of both device types in the limited subpixel layout, enabling higher pixel density without violating process rules.
2Quantity of substance
If the layout area for transistors is reduced to increase pixel density, then more pixel units can be fitted, but proper placement of high-voltage and low-voltage devices becomes difficult
Solution Approach 1:
Different regions of the pixel layout are assigned different qualities and functions: the high-voltage device area is optimized for high-voltage transistors, the low-voltage device area for low-voltage transistors, and the transition area facilitates integration. This local differentiation enables compact overall layout while maintaining proper device placement.
Data Source
AI summary
Embodiments of the present disclosure provide a structure of pixel layout and an electroluminescent display, wherein there is at least one pixel unit including the structure of pixel layout in the electroluminescent display. The structure of pixel layout includes a high-voltage device area, a low-voltage device area, and a transition area. The first type of high-voltage transistor and the capacitor of the transition area share the second type of well contact, and the second type of low-voltage transistor in the low-voltage device area includes a first type of well contact coupled to an intermediate voltage terminal. With such configuration, the operating voltage of each device may be adjusted so that the pixel circuit can operate normally in a limited layout area of a subpixel, and the problem that the pixel density cannot be improved is solved.