LCD Driving Method for Data Coupling and Resolution
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Solution Overview
Problem
As the resolution of liquid crystal display devices increases, the gap between neighboring pixels decreases, leading to increased parasitic capacitance and data coupling, which results in uneven luminance and deteriorated display quality.
Innovation Solution
The implementation of a method where a first and second scan signal are applied to specific pixel rows with data voltages of different polarities, inverted on a frame-by-frame basis, to prevent data coupling and ensure sufficient data charge time, thereby improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of unit pixels is increased to improve resolution, then the resolution is improved, but the gap distance between neighboring pixels is shortened leading to increased parasitic capacitance and data coupling
Solution Approach 1:
The patent applies preliminary anti-action by applying scan signals and data voltages in a specific sequence before the harmful data coupling can occur. The second scan signal is applied to pixels (n+1) and (n+3) before the first scan signal is applied to pixels (n) and (n+2), creating a time-separated charging process that prevents simultaneous voltage application and thus prevents data coupling between neighboring pixels while maintaining high resolution
Solution Approach 2:
The patent implements preliminary action by pre-charging the pixel capacitors in a specific sequence. The second scan signal activates pixels (n+1) and (n+3) first, allowing their capacitors to charge before the first scan signal activates pixels (n) and (n+2). This sequential preliminary charging ensures that voltage is applied to each pixel group when the other group is already in a stable state, preventing interaction between neighboring pixels
2Measurement precision
If the number of scan lines is increased to improve resolution, then the resolution is improved, but the time required to charge external charge to one pixel electrode is decreased
Solution Approach 1:
The patent merges the scanning of multiple pixels by applying the second scan signal simultaneously to both pixels (n+1) and (n+3), and the first scan signal simultaneously to both pixels (n) and (n+2). This merging of scan operations allows multiple pixels to be charged in parallel within the same time frame, effectively increasing the data charge time available for each pixel while maintaining high resolution
Solution Approach 2:
The patent employs periodic action by using two alternating scan signals that are applied in a repeating sequence. The second scan signal is applied first to pixels (n+1) and (n+3), then the first scan signal is applied to pixels (n) and (n+2), creating a periodic charging cycle. This periodic alternation ensures that each pixel receives sufficient charging time while the overall scanning process maintains high resolution through efficient pixel sequencing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively prevents data coupling between neighboring pixels, ensuring consistent luminance and enhancing the overall display quality of liquid crystal display devices.
Implementation Method 1
The LCD device changes an electric field formed between the pixel electrode and the common electrode by providing external charge (i.e., gradation signal) to the pixel electrode through the thin film transistor. The alignment of liquid crystal molecules is controlled by the change of the electric field
Implementation Method 2
The pixel capacitor may include a pixel electrode, a common electrode and liquid crystals provided between the pixel electrode and the common electrode. The alignment of liquid crystal molecules is controlled by the change of the electric field
Implementation Method 3
The pixel capacitor may include a pixel electrode, a common electrode and liquid crystals provided between the pixel electrode and the common electrode
Data Source
AI summary
A liquid crystal display device includes a plurality of pixels arranged substantially in a matrix form, where a part of the plurality of pixels defines a pixel column block, a first scan signal is simultaneously applied to an n-th row pixel and an (n+2)-th row pixel of the pixel column block, a second scan signal, which is applied prior to the first scan signal, is simultaneously applied to an (n+1)-th row pixel and an (n+3)-th row pixel of the pixel column block, a first data voltage is applied to the n-th row pixel and the (n+1)-th row pixel, a second data voltage having a polarity different from a polarity of the first data voltage is applied to the (n+2)-th row pixel and the (n+3)-th row pixel, and the polarities of the first data voltage and the second data voltage are inverted on a frame-by-frame basis.