Variable-Frequency Display Panel Gain Control for Flicker-Free Luminance
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Solution Overview
Problem
Display devices experience image distortion and flickering due to luminance differences caused by varying driving frequencies during low-speed operation, leading to a degradation of image quality.
Innovation Solution
The display device includes a frequency generation unit to generate frequency information, a gain generation unit to calculate gain values based on previous frame frequencies, and a video data output unit to adjust video data based on these gain values, ensuring consistent luminance across frames with different driving frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the refresh rate is reduced to lower operating frequency, then power consumption is reduced and device lifespan is extended, but luminance differences occur between pixels due to voltage discharge causing image distortion and flickering
Solution Approach 1:
The patent applies preliminary action by performing voltage compensation before the low-frequency operation begins. The compensation voltage is calculated and prepared in advance based on the expected discharge characteristics during low-refresh-rate operation, ensuring that luminance uniformity is maintained from the start of low-speed operation without requiring real-time adjustments that would increase power consumption.
Solution Approach 2:
The patent changes the voltage parameter by introducing a compensation voltage that is added to the data voltage during low-frequency operation. This parameter change counteracts the voltage discharge effect that occurs at lower refresh rates, maintaining consistent pixel luminance while preserving the energy savings benefits of reduced operating frequency.
2Use of energy by stationary object
If the refresh rate is reduced to low-speed operation, then power consumption is reduced, but voltage discharge causes luminance differences and image distortion
Solution Approach 1:
The patent converts the harmful voltage discharge effect into a beneficial compensation mechanism. Instead of allowing voltage discharge to cause luminance differences, the system calculates a compensation voltage based on the discharge characteristics and applies it to counteract the effect. This transforms the harmful discharge phenomenon into a controlled and beneficial voltage adjustment that maintains image quality.
Solution Approach 2:
The patent implements feedback by continuously monitoring the operating conditions during low-frequency operation and adjusting the compensation voltage accordingly. The system uses information about the actual voltage discharge behavior to refine the compensation strategy, ensuring optimal luminance uniformity while maintaining low power consumption.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, the plurality of pixels driven during a first frame with a first driving frequency and a second frame with a second driving frequency, a frequency generation unit configured to generate first frequency information indicative of the first driving frequency of the first frame after an end of the first frame, a gain generation unit configured to receive the first frequency information indicative of the first driving frequency generated by the frequency generation unit and generate a first gain value for the second frame based on the first driving frequency of the first frame indicated in the received first frequency information, and a video data output unit configured to output video data generated based on the first gain value to a data driving unit during the second frame.