Stage Circuit Layout for Uniform Scan Signal Luminance
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Solution Overview
Problem
Existing display devices experience luminance differences across horizontal lines due to variations in scan signal distribution, which affect image quality.
Innovation Solution
A stage circuit design with a driving circuit, output circuits, and connection circuits that control voltage levels and electrical connections between nodes, using capacitors and transistors to synchronize scan signals and minimize luminance discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If scan signals are supplied to pixels through stage circuits, then display functionality is achieved, but luminance differences occur across horizontal lines
Solution Approach 1:
The stage circuit is divided into multiple independent stage circuits, each responsible for controlling specific scan signals to specific horizontal lines. This segmentation allows independent optimization of each stage circuit to compensate for luminance differences across different horizontal lines, thereby improving overall luminance uniformity while maintaining functional scan signal distribution
Solution Approach 2:
Each stage circuit is configured with different electrical connection characteristics tailored to its specific horizontal line requirements. By adjusting local circuit parameters such as connection timing and electrical characteristics, the patent compensates for luminance variations in different regions, achieving uniform luminance across all horizontal lines without compromising scan signal distribution functionality
2Stability of the object's composition
If connection circuits electrically connect first node and local nodes during first period, then voltage synchronization is improved, but circuit complexity increases
Solution Approach 1:
The connection circuits operate in periodic cycles, electrically connecting the first node and local nodes during specific first periods when voltage synchronization is needed, and disconnecting during second periods. This periodic operation maintains voltage level consistency through timed connections while simplifying the circuit structure by avoiding permanent complex interconnections, thus resolving the contradiction between stability and complexity
Solution Approach 2:
The electrical connection state between the first node and local nodes is dynamically changed based on operational requirements. The connection circuits can switch between connected and disconnected states, allowing the circuit to adapt its complexity level - connected during voltage synchronization periods and disconnected during other periods - thereby maintaining voltage consistency without permanently increasing circuit complexity
Data Source
AI summary
A stage circuit includes: a driving circuit connected to a first power input terminal configured to receive a first power source and a second power input terminal configured to receive a second power source, the driving circuit controlling a voltage of a first node; first output circuits receiving any one of a plurality of scan clock signals, the first output circuits outputting enable scan signals, based on a voltage of any one of local nodes; and connection circuits connected between the respective local nodes and the first node, the connection circuits controlling electrical connections between the first node and the local nodes, corresponding to a voltage input to a connection control line. The connection circuits electrically connect the first node and the local nodes to each other during a first period in a period in which the first node has a voltage of a first level or higher.