Gate Driving Apparatus for Display Panel with Sub-Frame Voltage Control
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Solution Overview
Problem
Current display panel driving technologies for vertical alignment mode liquid crystal display panels face challenges in improving display quality, particularly in maintaining optimal liquid crystal alignment and viewing angles, due to limitations in voltage control and signal management during sub-frame periods.
Innovation Solution
A display panel driving apparatus with a data driving part and a gate driving part that outputs different gate voltages during multiple sub-frame periods within a frame period, allowing for precise control of charge voltages in pixel electrodes, thereby optimizing liquid crystal alignment and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gate voltage is applied during the entire frame period, then the circuit design is simple, but the liquid crystal alignment and viewing angle are insufficient
Solution Approach 1:
The frame period is divided into multiple sub-frame periods (first, second, and third sub-frames), and different gate voltages are applied to the gate line during each sub-frame. This segmentation allows the liquid crystal molecules to be aligned at different angles sequentially, thereby improving the viewing angle without requiring complex additional hardware
Solution Approach 2:
The patent applies periodic gate voltage variations within the frame period by dividing it into sub-frames with different voltages (e.g., first gate voltage in first sub-frame, second gate voltage in second sub-frame, third gate voltage in third sub-frame). This periodic voltage modulation enables dynamic liquid crystal alignment that enhances viewing angle performance
2Illumination intensity
If different gate voltages are applied during sub-frame periods, then the viewing angle is improved, but the charge voltage control becomes more complex
Solution Approach 1:
The liquid crystal alignment is adjusted in advance during specific sub-frame periods before the main display frame. For example, the first gate voltage is applied during a first sub-frame period to pre-align the liquid crystal molecules, and then the data signal is applied during subsequent periods. This preliminary alignment action simplifies the overall control by separating the alignment phase from the display phase
Solution Approach 2:
The patent dynamically adjusts gate voltages during different sub-frame periods within the frame period. The gate driving circuit switches between different gate voltages (first, second, third gate voltages) at different times, creating a dynamic control scheme that improves viewing angle while managing charge voltage complexity through time-multiplexed operation
3Manufacturing precision
If multiple gate voltages are used for liquid crystal alignment, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent uses periodic gate voltage variations within the frame period by dividing it into sub-frames with different voltages (e.g., first gate voltage in first sub-frame, second gate voltage in second sub-frame, third gate voltage in third sub-frame). This periodic voltage modulation enables dynamic liquid crystal alignment that enhances viewing angle performance
Solution Approach 2:
The patent utilizes the natural relaxation and retention properties of liquid crystal molecules. After applying different gate voltages during sub-frames to achieve proper alignment, the system can maintain the alignment with reduced or zero gate voltage during the display period, effectively recovering energy while preserving the alignment state
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
The solution improves display quality by increasing the viewing angle and maintaining consistent grayscale representation across sub-frame periods, leading to better image display and reduced power consumption.
Implementation Method 1
The liquid crystal layer includes a liquid crystal interposed between the lower substrate and the upper substrate. An arrangement of the liquid crystal is changed by an electric field generated due to a pixel voltage applied to the pixel electrode and a common voltage applied to the common electrode.
Implementation Method 2
When the electric field between the pixel electrode and the common electrode is not applied to the liquid crystal in a liquid crystal display apparatus of a vertical alignment mode, the liquid crystal is arranged in a vertical direction with respect to the lower substrate and the upper substrate. When the electric field between the pixel electrode and the common electrode in a liquid crystal display apparatus of a vertical alignment mode is applied to the liquid crystal, the arrangement of the liquid crystal is changed according to an intensity of the electric field.
Data Source
AI summary
A display panel driving apparatus includes a data driving part and a gate driving part. The data driving part is configured to convert image data into a data signal and output the data signal to a data line of a display panel. The gate driving part is configured to output, to a gate line of the display panel, a gate signal having different gate on voltages during a first sub-frame period of a frame period and a second sub-frame period subsequent to the first sub-frame period. Thus, display quality of a display apparatus may be improved.