Display Device Dimming Controller Frame Frequency Transition
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Solution Overview
Problem
Display devices experience a posterization effect when frame frequency changes, leading to recognizable luminance changes due to nonlinear human eye response and varying gamma correction data with frame frequency, degrading display quality.
Innovation Solution
A display device with a dimming controller that gradually changes frame frequency and gamma correction data based on a duty ratio of the light emission control signal, allowing for seamless transitions and preventing luminance recognition during frequency changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the frame frequency is changed according to image characteristics to reduce power consumption, then power consumption is reduced, but the human eye recognizes the luminance change causing posterization effect
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing multiple sets of gamma correction data corresponding to different frame frequencies (60Hz, 75Hz, 90Hz, 120Hz) in advance. When frame frequency needs to be changed, the system selects and applies the appropriate pre-prepared gamma correction data, avoiding the need for real-time calculation and ensuring smooth transition without visible luminance changes.
Solution Approach 2:
The patent changes the parameter of gamma correction data according to frame frequency changes. Different frame frequencies have different corresponding gamma correction data values, and the system dynamically adjusts the gamma correction data parameter to match the new frame frequency, thereby compensating for the luminance change and preventing the posterization effect.
2Measurement precision
If gamma correction data is changed when frame frequency is changed, then luminance accuracy is improved, but the change in luminance is instantly recognized degrading display quality
Solution Approach 1:
The patent prepares multiple sets of gamma correction data for different frame frequencies in advance during system initialization or manufacturing. This preliminary preparation allows the system to instantly switch to the appropriate gamma correction data when frame frequency changes, ensuring both luminance accuracy and smooth transition without visible artifacts.
Solution Approach 2:
The patent creates multiple copies of gamma correction data tailored for different frame frequencies (60Hz, 75Hz, 90Hz, 120Hz). Each copy is optimized for its specific frame frequency, and the system selects the appropriate copy based on the current frame frequency, ensuring accurate luminance representation without visible transitions.
Data Source
AI summary
The present disclosure relates to a display device and a method of driving the same, and more specifically, to a display device for preventing a user from recognizing a change in luminance when a frame frequency is changed, and a method of driving the same. A display device of the present disclosure includes a display panel including a plurality of pixel regions, a gate driver configured to sequentially supply light emission control signals to horizontal lines of the display panel, a data driver configured to supply a data signal corrected by a source voltage to the display panel, and a dimming controller configured to control whether to gradually change a frame frequency and gamma correction data according to a duty ratio of the light emission control signal.