Display Timing Controller Park Voltage Vertical Blank
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Solution Overview
Problem
Existing display devices face challenges in maintaining image quality during low-speed driving modes, particularly in reducing power consumption and preventing flicker, due to variations in pixel electrical characteristics and scanning orders.
Innovation Solution
A display device and driving method that include a timing controller to control refresh rates, transmit park data during vertical blank periods, and convert pixel data to data voltage, eliminating the need for a circuit to switch between data and park voltages, allowing for optimal park voltage adjustment based on pixel position and frame frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the refresh rate is reduced in low speed driving mode, then power consumption is reduced, but image quality deteriorates and flicker occurs
Solution Approach 1:
The patent applies preliminary action by transmitting park data during the vertical blank period before the actual display refresh. This allows the data driving circuit to prepare and convert park data to park voltage in advance, ensuring that when the low refresh rate occurs, the pixel electrodes are already charged with appropriate voltage levels, preventing image quality deterioration and flicker while maintaining reduced power consumption
Solution Approach 2:
The patent changes the parameter of voltage application timing by applying park voltage to pixel electrodes during the vertical blank period rather than during the active display period. This parameter change allows the system to maintain proper electrode charging at reduced refresh rates, resolving the contradiction between low power consumption and image quality in low speed driving mode
2Adaptability or versatility
If a circuit is added to switch between data voltage and park voltage, then voltage control flexibility is improved, but device complexity increases
Solution Approach 1:
The patent implements periodic action by applying park voltage during the vertical blank period and data voltage during the active display period in a time-multiplexed manner. This periodic switching is controlled by timing signals without requiring physical switch elements in the data driving circuit, achieving voltage control flexibility while minimizing circuit complexity
Solution Approach 2:
The patent extracts the voltage switching function from the data driving circuit by handling voltage selection at the timing controller level through periodic action. This removes the need for switch elements within the data driving circuit, reducing device complexity while maintaining the ability to apply different voltages at appropriate times
Data Source
AI summary
The present disclosure relates to a display device and a driving method thereof, wherein a refresh rate of pixels is controlled at a reference frame frequency in a normal driving mode, and the refresh rate of the pixels is controlled at a frequency lower than the reference frame frequency in a low speed driving mode. In the low speed driving mode, park data is transmitted to a data driving circuit during at least one vertical blank period.