OLED Array Substrate Switch Layout for Uniform Pixel Driving
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Solution Overview
Problem
Inconsistent characteristics of pixel circuits in OLED array substrates can affect display uniformity, particularly at low grayscale levels under high refresh rates, due to uneven static electricity distribution and potential short circuits between nodes.
Innovation Solution
The array substrate design connects first semiconductor portions of adjacent pixel circuits through a second semiconductor portion, forming a switch element that cuts off electrical connection between nodes, ensuring even static distribution and consistent performance across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel circuits are arranged in an array on OLED array substrate, then display functionality is achieved, but inconsistent characteristics of pixel circuits occur affecting display uniformity
Solution Approach 1:
A switch element comprising a control portion and a semiconductor portion is introduced as an intermediary component between adjacent pixel circuits. The switch element includes a first node connected to a first reference signal line, a second node connected to a second reference signal line, and a control terminal. This intermediary structure isolates adjacent pixel circuits, preventing static electricity interference and ensuring even static distribution across the array substrate, thereby improving display uniformity without complicating the overall device architecture.
2Speed
If high refresh rate is implemented, then display responsiveness is improved, but static electricity distribution becomes uneven at low grayscale levels
Solution Approach 1:
The switch element acts as an intermediary that isolates adjacent pixel circuits during high refresh rate operations. By controlling the switch element through the control terminal, static electricity distribution is equalized across the array substrate even at low grayscale levels, enabling high refresh rates to be maintained without compromising static electricity distribution uniformity.
3Adaptability or versatility
If adjacent pixel circuits are connected on the substrate, then circuit functionality is achieved, but short circuits between nodes may occur
Solution Approach 1:
The switch element serves as an intermediary connection between adjacent pixel circuits. The semiconductor portion with control terminal allows controlled connectivity while preventing unwanted short circuits between first nodes and second nodes of adjacent pixel circuits. This maintains necessary circuit functionality while ensuring reliability by blocking short circuit paths.
Data Source
AI summary
An array substrate, a display panel and a display device are provided. The array substrate includes a plurality of pixel circuits arranged in an array in a first direction and a second direction, where each pixel circuit includes a first semiconductor portion including a first node and a second node; a first reference signal line and a second reference signal line electrically connected to the first node and the second node, respectively; and a switch element formed by a second semiconductor portion and a control portion. In adjacent two pixel circuits in the second direction, the first node of one pixel circuit is connected to the second node of the other one pixel circuit through the second semiconductor portion. The control portion has an orthographic projection on a plane of the array substrate at least partially overlapping the second semiconductor portion.