Gate Driving Circuit Uniform Brightness Hetero-Shape Display
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with hetero-shaped regions experience nonuniform brightness due to varying loads on gate lines, resulting in display nonuniformity as different rows of sub-pixels receive different driving energies.
Innovation Solution
A gate driving circuit with cascaded output units, each having output transistors with different active region sizes and width-to-length ratios, is used to classify gate lines based on the number of sub-pixels they serve, allowing for tailored driving signals to ensure uniform brightness across all sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If all gate lines are driven by output transistors with the same output capability, then the circuit structure is simple and easy to manufacture, but the brightness becomes nonuniform across different rows of sub-pixels
Solution Approach 1:
The patent applies local quality by differentiating the output capability of transistors based on their specific position and function in the circuit. Output transistors are divided into first output transistors (coupled to gate lines serving more sub-pixels) and second output transistors (coupled to gate lines serving fewer sub-pixels), with different active region sizes to provide locally optimized driving capability for each gate line group, thereby achieving uniform brightness across all sub-pixels.
2Illumination intensity
If output transistors have different output capabilities tailored to gate line loads, then display brightness uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the gate driving circuit into multiple output units, each containing output transistors with specific output capabilities matched to their corresponding gate lines. This segmentation allows independent optimization of each transistor group without redesigning the entire circuit, managing complexity through modular organization while achieving uniform brightness performance.
Data Source
AI summary
A gate driving circuit and a display substrate are provided. The gate driving circuit may provide a driving signal to gate lines, and include output units cascaded to each other and having a same circuit structure. Each output unit includes at least one output transistor, outputs the driving signal to a corresponding gate line through the output transistor, and all the at least one output transistor is coupled to one gate line. The output units are classified as first and second output units. A number of sub-pixels coupled to the gate line corresponding to each first output unit is greater than a number of sub-pixels coupled to the gate line corresponding to each second output unit, and an output capability of at least one output transistor of the first output unit is greater than an output capability of a corresponding output transistor of the second output unit.