Display Device Low-Speed Driving Flicker Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for driving display devices at low speed often result in a reduction in image quality due to flicker caused by voltage discharge, leading to a decrease in pixel brightness with each data update cycle.
Innovation Solution
A display device and method that reduce the driving frequency and power consumption by extending the horizontal blank time and distributing image data writing over multiple frames, preventing flicker by ensuring sufficient time to discharge parasitic capacitance between data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the pixels are driven at a low speed to reduce power consumption, then power consumption is reduced, but image quality deteriorates due to flicker caused by voltage discharge
Solution Approach 1:
The patent applies preliminary action by extending the horizontal blank time before data writing to allow parasitic capacitance to discharge completely. This pre-discharge action prevents voltage fluctuations during low-speed driving, eliminating flicker while maintaining reduced power consumption benefits.
Solution Approach 2:
The patent changes the timing parameter by extending the horizontal blank time period. This parameter adjustment ensures sufficient discharge time for parasitic capacitance, thereby preventing image quality deterioration while operating in low-speed mode with reduced power consumption.
2Reliability
If the horizontal blank time is extended to prevent flicker, then image quality is maintained, but the frame period increases
Solution Approach 1:
The patent applies partial action by extending the horizontal blank time only during low-speed driving mode, not during normal operation. This selective extension maintains image quality when needed while minimizing the impact on overall frame period and throughput.
Solution Approach 2:
The patent implements dynamic adjustment of the horizontal blank time based on driving mode. The blank time is extended specifically during low-speed mode to prevent flicker, while returning to normal duration in standard mode, thereby balancing image quality requirements with time efficiency.
3Productivity
If one frame of image data is written during one frame period in normal mode, then productivity is high, but power consumption increases compared to distributed writing
Solution Approach 1:
The patent applies segmentation by dividing the writing of one frame of image data into multiple frame periods during low-speed mode. This distributed writing approach reduces instantaneous power consumption while maintaining acceptable productivity through the extended horizontal blank time that prevents flicker.
Data Source
AI summary
Provided are a display device and method of driving the same. A display device includes: a display panel including: intersecting data lines and gate lines, and pixels in a matrix, a timing controller allowing the pixels to be driven at a lower refresh rate in low-speed driving mode than in normal driving mode, and controlling a horizontal blank time to be longer in the low-speed driving mode than the normal driving mode, the horizontal blank time being a period of time during which no data voltage exists, between an nth data voltage and an (n+1)th data voltage consecutively supplied through the data lines, “n” being a positive integer, and a display panel driving circuit writing one frame of image data to the pixels during one frame period in the normal driving mode, and in a distributed manner during a second to fourth frame period in the low-speed driving mode.