Display Panel Demux Kickback Compensation by Pixel Position
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Solution Overview
Problem
Display apparatuses experience deteriorated display quality due to differences in kickback levels among pixels caused by demux switching, which is not adequately addressed by existing technologies.
Innovation Solution
Implement a demux structure that alternately applies data voltages to adjacent data lines and utilize a driving controller to compensate for kickback differences by determining pixel positions and applying offset values where necessary, reducing the number of output amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a demux structure is used to reduce the number of output amplifiers, then device complexity and manufacturing cost are reduced, but display quality deteriorates due to kickback differences among pixels
Solution Approach 1:
The patent applies local quality by determining the position of each pixel in the display panel and selectively compensating for kickback based on position. Pixels at different positions (e.g., odd vs even columns) receive different compensation treatments through the lookup table, which stores position-specific offset values. This resolves the contradiction by maintaining uniform display quality across all pixels while still using the simplified demux structure with fewer amplifiers.
Solution Approach 2:
The patent changes the parameter of data voltage by adding position-dependent offset values to compensate for kickback effects. The driving controller retrieves offset values from the lookup table based on pixel position and adds them to the input data voltage before output. This parameter modification eliminates display quality deterioration caused by the demux structure while preserving the reduced amplifier configuration.
2Productivity
If demux switching is implemented to alternately apply data voltages to adjacent data lines, then the number of output amplifiers is reduced, but kickback variations occur among pixels at different positions
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing kickback compensation offset values for different pixel positions in the lookup table before actual display operation. The driving controller uses this pre-prepared compensation data to adjust input voltages in real-time, ensuring consistent display quality while maintaining the efficient demux switching operation that alternately drives adjacent data lines.
Solution Approach 2:
The patent implements feedback by using the stored offset values in the lookup table to compensate for kickback effects that vary with pixel position. The driving controller continuously adjusts the input data voltage based on the pixel position and corresponding offset values, creating a closed-loop compensation mechanism that maintains input data consistency despite the demux switching operations.
Data Source
AI summary
A display apparatus includes a display panel, a data driver, a demux circuit and a driving controller. The data driver outputs a data voltage to the display panel. The demux circuit alternately outputs the data voltage to adjacent data lines of the display panel. The driving controller compensates a difference of kickback of input data which is generated due to a demux switching of the demux circuit.