OLED Pixel Driving Control for Low-Frequency VRR Flicker
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Solution Overview
Problem
Display devices using electroluminescent devices experience flicker during scene changes due to luminance differences during grayscale changes in low-frequency VRR mode, causing unnatural perception.
Innovation Solution
A display device with a controller that divides pixels into refresh and hold periods, using a driving transistor with data and bias voltages to compensate for luminance deviations through methods of luminance deviation compensation driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If low-frequency driving is used in VRR mode to reduce power consumption, then power consumption is reduced, but luminance deviation occurs during grayscale change causing flicker
Solution Approach 1:
The patent applies preliminary action by performing bias stress compensation before the actual display of grayscale changed images. The controller identifies when grayscale changes occur and applies compensation signals to pixels in advance, preventing luminance deviation and flicker before they manifest, thus maintaining display quality during low-frequency VRR operation.
2Use of energy by stationary object
If refresh rate is reduced during low-frequency driving, then power consumption decreases, but flicker occurs during scene change
Solution Approach 1:
The patent converts the harmful effect of reduced refresh rate (which causes flicker) into a benefit by using the lower refresh rate to reduce power consumption while applying targeted compensation signals to eliminate flicker. The compensation mechanism transforms the disadvantage of low refresh rate into an acceptable solution that maintains both low power consumption and flicker-free display.
3Adaptability or versatility
If grayscale change is performed during low-frequency VRR mode, then image content can be updated, but luminance deviation occurs causing unnatural perception
Solution Approach 1:
The patent implements feedback by continuously monitoring grayscale changes and using this information to generate appropriate compensation signals. When a grayscale change is detected, the controller adjusts pixel driving signals based on the detected change, creating a closed-loop system that maintains display quality while enabling image updates during low-frequency VRR operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces luminance deviations and improves flicker by stabilizing the bias stress of driving transistors during scene changes, enhancing display quality.
Implementation Method 1
a plurality of pixels include an electroluminescent device and a pixel circuit for driving the electroluminescent device
Data Source
AI summary
Disclosed is a display device including: a display panel on which a plurality of pixels are arranged to display an image; a gate driver supplying scan signals and emission control signals to the display panel; and a controller driving the pixels by dividing the pixels into a refresh period and a hold period, and the plurality of pixels include an electroluminescent device and a pixel circuit for driving the electroluminescent device, and the pixel circuit includes a driving transistor having a first electrode configured to be applied with a data voltage and a bias voltage, and a second electrode connected to the electroluminescent device.