Display Device Flicker Reduction via On-Pixel Ratio Compensation
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Solution Overview
Problem
Display devices experience visible flicker when switching from high to low display frequency, leading to a change in luminance cycle, which affects user perception.
Innovation Solution
A display device and driving method incorporating a demultiplexer, compensator, and data driver that calculate and apply an on-pixel ratio (OPR) to generate compensation data, which is supplied during a blank period to reduce flicker visibility by maintaining data signal integrity across frequency changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If display frequency is reduced from high frequency to low frequency, then power consumption is reduced, but flicker becomes visible
Solution Approach 1:
The patent applies preliminary action by calculating the on-pixel ratio before the frequency switch occurs and storing the compensation data in advance. The compensator calculates the OPR based on input data during the high-frequency operation phase, and the memory unit stores the compensation data before switching to low frequency. This ensures that when frequency switching happens, the compensation data is already ready to be applied during the blank period, preventing flicker without requiring real-time calculation during the transition.
2Use of energy by moving object
If display frequency is switched from high frequency to low frequency, then power consumption is reduced, but luminance cycle changes causing visible flicker
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the data signal based on the on-pixel ratio. The compensator calculates the OPR which reflects the proportion of active pixels, and the data driver uses this information to modify the data signal amplitude. By changing the signal parameter according to the actual pixel activation state, the system maintains consistent luminance waveform despite the lower refresh rate, thereby eliminating flicker while preserving image quality.
3Object-affected harmful factors
If data signal is supplied continuously during blank period, then flicker is reduced, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the demultiplexer and compensator to serve multiple functions. The demultiplexer not only distributes data signals to multiple data lines during normal operation but also handles the compensation data signal during the blank period. The compensator simultaneously calculates the on-pixel ratio for normal display operation and generates compensation data for flicker reduction during blank periods. This multi-functionality reduces the need for separate dedicated circuits, thereby limiting the increase in device complexity while achieving flicker reduction.
Data Source
AI summary
Embodiments of the present disclosure relate to a display device and a driving method thereof, and the display device includes a demultiplexer connected to a first data line and transferring a data signal from the first data line to a plurality of second data lines during a data writing period of one frame, a compensator calculating an on-pixel ratio (OPR) using input data in the one frame and generating compensation data corresponding to a calculated OPR, and a data driver supplying the data signal to the first data line using the input data during the data writing period, and supplying a compensation data signal to the first data line using the compensation data in a blank period of the one frame, and the demultiplexer supplies the compensation data signal from the first data line to a second data line during the blank period.