Data Line Voltage Driving for Flat Panel Displays
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Solution Overview
Problem
As flat panel displays increase in size, the trace resistance and parasitic capacitance of data lines lead to higher charge/discharge driving power consumption during voltage switching, necessitating a reduction in power consumption.
Innovation Solution
A pixel voltage driving method and adaptation-mode data line voltage driving mechanism that calculate and compare voltage differences between adjacent pixels, adjusting data line voltages based on a preset value to minimize unnecessary voltage switching and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the dimensions of the flat panel display are increased, then the display area is improved, but the trace resistance and parasitic capacitor of each data line increase, resulting in higher charge/discharge driving power consumption
Solution Approach 1:
The patent applies preliminary action by predicting future pixel voltages before actual writing operations. The data driver predicts the voltage that will be written to adjacent pixels in the next row, and based on this prediction, pre-adjusts the data line voltage to minimize the voltage change magnitude. This proactive approach reduces the charge/discharge power consumption during voltage switching.
Solution Approach 2:
The patent implements dynamics by making the data line voltage adaptive rather than static. The voltage level on the data line is dynamically adjusted based on the predicted voltage difference between current and next row pixels. The driver selectively applies different voltage levels (first voltage level for large differences, second voltage level for small differences) to optimize power consumption while maintaining display performance.
2Productivity
If the voltage switching frequency at each data line is increased, then the pixel voltage writing speed is improved, but the charge/discharge driving power consumption increases
Solution Approach 1:
The patent applies parameter changes by modifying the voltage level parameter dynamically. Instead of using a fixed voltage switching scheme, the system changes the voltage level parameter based on the predicted voltage difference. When the difference is small, a smaller voltage swing is used; when the difference is large, a larger voltage swing is applied. This adaptive parameter adjustment reduces energy consumption while maintaining writing speed.
3Reliability
If the data line voltage is frequently switched to maintain image quality, then the display performance is improved, but the power consumption increases
Solution Approach 1:
The patent implements feedback by using the predicted voltage information to adjust the data line voltage. The system continuously monitors the voltage difference between adjacent pixels and uses this feedback to optimize the voltage switching strategy. This closed-loop approach ensures that voltage switching occurs only when necessary and with the minimum required magnitude, reducing energy loss while maintaining display quality.
Data Source
AI summary
A display apparatus includes a pixel array, a data line and a data driver. The pixel array has adjacent first and second pixels disposed in different rows. The data line transmits first and second pixel voltages to be written into the first and second pixels respectively. The first and second pixel voltages are employed to illustrate a same frame. The data driver is utilized for generating the first and second pixel voltages furnished to the data line based on input image data. The data driver includes a voltage analysis unit and a voltage setting unit. The voltage analysis unit is used for calculating a voltage difference between the first and second pixel voltages, and for comparing the voltage difference with a preset value so as to generate a control signal. The voltage setting unit is utilized for setting the voltage of the data line according to the control signal.