Pixel Circuit Driving Method for Display Device
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Solution Overview
Problem
The existing driving methods for pixel circuits, such as Z inversion, often result in cross striation due to asymmetry in positive and negative pixel voltages, leading to poor display quality.
Innovation Solution
A method involving alternating between two different preset modes for outputting gate and data signals to the pixel circuit, where the first mode groups rows disorderly and the second mode outputs signals sequentially, balancing charging time across rows to alleviate cross striation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If Z inversion driving mode is used, then column inversion achieves point inversion effect, but cross striation appears during image displaying
Solution Approach 1:
The patent applies periodic action by alternating between two different driving modes (first preset mode and second preset mode) in a cyclic manner. The driving device switches between these modes periodically, where each mode uses different gate signal output sequences to different rows of pixel units. This periodic alternation prevents the formation of cross striation by disrupting the fixed pattern that causes the visual artifact, while maintaining the benefits of inversion driving.
2Ease of operation
If gate signals are output in fixed sequence to all rows, then driving control is simplified, but bright and dark differences between rows occur
Solution Approach 1:
The patent implements dynamics by making the gate signal output sequence adaptable rather than fixed. The driving device dynamically adjusts the output sequence based on the current driving mode: in the first preset mode, it uses a first sequence for grouping rows, while in the second preset mode, it uses a second sequence. This dynamic adjustment eliminates bright and dark differences between rows while maintaining operational simplicity through automated mode switching.
3Stability of the object's composition
If single driving mode is used continuously, then driving circuit operation is stable, but charging time asymmetry occurs between positive and negative pixel voltages
Solution Approach 1:
The patent applies asymmetry principle by using two different driving modes with asymmetric characteristics. The first preset mode and second preset mode employ different gate signal output sequences that are asymmetric with respect to each other. By alternating between these asymmetric modes, the system compensates for charging time asymmetry in positive and negative pixel voltages, achieving overall symmetry in charging characteristics while maintaining circuit operation stability.
Data Source
AI summary
A display device, a pixel circuit and its driving method and driving device. The driving method includes the steps of, during a frame sequence formed by successive X frames of image displaying, outputting gate signals and data signals to the pixel circuit in a first preset mode; during a frame sequence formed by successive Y frames and adjacent to the frame sequence formed by successive X frames of image displaying, outputting gate signals and data signals to the pixel circuit in a second preset mode, wherein the first preset mode is different from the second preset mode, and X and Y are positive integers not less than 2. The method can enable the charging time of the pixel circuit to be balanced in space, thereby improving image display quality.