Data Driving Device Overdrive Multiplexer Slew Rate
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Solution Overview
Problem
Existing display devices face limitations in improving slew rate and display speed due to the constraints of the maximum output voltage from the data driving device's buffer, which restricts the reduction of display time.
Innovation Solution
A data driving device that overdrives pixels using a power voltage higher than the buffer's maximum output voltage, with a multiplexer receiving the power voltage and generating an overdrive control signal based on pixel data comparisons to differentiate overdrive times according to pixel distance from the buffer, thereby enhancing slew rate and display speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a buffer outputs a data voltage to drive a pixel, then the pixel can be driven with a controlled voltage, but the slew rate and display speed are limited by the maximum output voltage of the buffer
Solution Approach 1:
The patent applies preliminary action by overdriving the pixel with a power voltage before the buffer outputs the data voltage. The multiplexer switches to connect the power voltage to the data line, pre-charging or pre-discharging the pixel's capacitance to accelerate the voltage transition. This preliminary voltage application reduces the time required for the pixel to reach its final display voltage, thereby improving display speed without requiring the buffer to output a higher maximum voltage.
2Power
If the buffer uses its maximum output voltage to overdrive pixels, then display speed can be improved, but the voltage is still insufficient to achieve further slew rate improvement
Solution Approach 1:
The patent introduces an intermediary power voltage source that operates independently of the buffer's voltage constraints. The multiplexer acts as a switch that selectively connects this external power voltage to the data line during overdrive periods. This intermediary voltage source provides the additional voltage headroom needed to achieve higher slew rates, while the buffer continues to operate within its original voltage limits, maintaining its design simplicity.
3Productivity
If a multiplexer is added to switch between power voltage and data voltage, then overdrive capability is improved, but device complexity increases
Solution Approach 1:
The multiplexer is designed to perform multiple functions: it switches between the power voltage and the buffer's data voltage output, and it controls the timing of the overdrive signal. By integrating these switching and timing control functions into a single multiplexer component, the patent reduces the overall device complexity compared to using separate switches and timing circuits. The multiplexer's multi-functionality justifies its addition by delivering significant performance improvements in display speed and slew rate.
Data Source
AI summary
The present disclosure relates to a data driving device and a display device including the same, and more particularly, to a data driving device and a display device including the same, capable of improving the slew rate and the display speed of the display device by overdriving a pixel of a display panel with a power voltage of the data driving device.