OLED Display Luminance Flicker Control via Dynamic Dimming Gain
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Solution Overview
Problem
Organic electroluminescent display devices experience flicker when luminance changes are made slowly, as the human eye perceives changes over multiple frames as flickering, leading to undesirable visual effects.
Innovation Solution
A display device and method that maintain the same gamma gray voltage across multiple frames while adjusting the dimming gain ratio of input data in each frame to naturally change luminance, using a control unit with a gray voltage generator and data driver that includes a dimming unit to output corrected data signals, ensuring the luminance change is not perceived as flicker by maintaining the same gamma gray voltage during frames lasting less than 1/15 seconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If luminance is changed slowly to avoid rapid changes, then energy consumption is reduced and display comfort is improved, but the luminance change is perceived as flicker by the human eye
Solution Approach 1:
The patent dynamically adjusts the luminance change rate based on the current luminance level. When luminance is high, changes are made more rapidly; when luminance is low, changes are made more slowly. This dynamic adaptation allows the display to achieve fast luminance transitions when needed while avoiding flicker perception at lower luminance levels, effectively resolving the contradiction between change speed and flicker avoidance.
Solution Approach 2:
The patent changes the parameter of luminance change rate according to the current luminance state. By adjusting the rate parameter adaptively - faster at high luminance, slower at low luminance - the system optimizes both response speed and visual comfort across different operating conditions, eliminating flicker while maintaining efficient luminance transitions.
2Ease of manufacture
If luminance levels are adjusted by equal amounts to achieve natural appearance, then display quality is improved, but the control complexity increases
Solution Approach 1:
Instead of using fixed equal increments for luminance adjustment, the patent changes the adjustment parameter to be adaptive - equal perceptual steps rather than equal numerical steps. This approach maintains natural appearance by ensuring each step is perceptually uniform while simplifying control through a straightforward adaptive algorithm that adjusts step size based on current luminance level.
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
This approach allows for natural luminance adjustment without perceived flicker, effectively changing luminance levels without causing visual discomfort by maintaining consistent gamma gray voltage and adjusting data output ratios within each frame, thereby improving display performance.
Implementation Method 1
Each pixel receives a data voltage, generates a driving current from the received data voltage, and supplies the driving current to the OLED. Then, the OLED emits light at a luminance level corresponding to the magnitude of the driving current.
Data Source
AI summary
Display device and method of driving the same are provided. According to an embodiment of the present invention, a display device includes a display unit which includes a plurality of pixels, and a control unit which adjusts luminance by maintaining the same gamma gray voltage during a plurality of frames and changing a dimming gain ratio of input data in each frame if a luminance level changes during the frames.