Pixel Reset Driving for Low-Frequency Display Flicker Control
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Solution Overview
Problem
Display devices driven at low frequency exhibit noticeable luminance decreases between frames, leading to user-perceptible flickering and image quality deterioration.
Innovation Solution
A display device and driving method that selectively switches between high and low frequencies, incorporating a reset voltage to minimize luminance changes and maintain consistent image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the display device is driven at a low frequency to reduce power consumption, then power consumption is reduced, but luminance decreases between frames causing user-perceptible flickering
Solution Approach 1:
The patent applies periodic action by implementing a dual-frequency driving scheme where the display device alternates between high frequency and low frequency modes. During still image display, the device operates at low frequency to save power, while during motion detection or initial display, it operates at high frequency to prevent flickering. This periodic switching between frequency modes resolves the contradiction between power consumption and luminance stability.
Solution Approach 2:
The patent implements dynamics by making the driving frequency adaptive rather than fixed. The system dynamically adjusts the operating frequency based on display content characteristics (still image vs. moving image) and detects luminance changes to switch between high and low frequency modes. This dynamic adaptation allows the device to optimize power consumption while maintaining acceptable luminance performance.
2Use of energy by stationary object
If the display device is driven at a low frequency, then power consumption is reduced, but image quality deteriorates due to noticeable luminance changes
Solution Approach 1:
The patent employs feedback mechanisms by detecting luminance changes between frames and using this information to control frequency switching. The system monitors whether luminance variation exceeds a threshold and adjusts the driving frequency accordingly. This feedback loop ensures that image quality is maintained by preventing excessive luminance changes while still allowing low-frequency operation for power savings.
Solution Approach 2:
The patent applies self-service by enabling the display device to automatically detect and respond to its own operating conditions. The system self-adjusts the driving frequency based on detected luminance changes and display content characteristics without external intervention. This self-service capability allows the device to maintain image quality while optimizing power consumption autonomously.
3Use of energy by stationary object
If the same data signal is written to the pixel during multiple frames, then power consumption is reduced, but luminance decreases between frames becomes more noticeable
Solution Approach 1:
The patent applies preliminary anti-action by proactively switching to high frequency mode when luminance decrease is detected or anticipated. Rather than waiting for luminance degradation to occur, the system preemptively adjusts the driving frequency to prevent the harmful effect. This preliminary counter-action maintains luminance stability while still allowing low-frequency operation during stable display conditions.
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 power consumption while preventing user-perceptible flickering and maintaining image quality by adjusting frequency modes and reset voltage application.
Implementation Method 1
the light-emitting device being configured to emit light by a driving current flowing from a first power voltage to a second power voltage in response to the data signal
Data Source
AI summary
A display device may include: a display panel including a pixel having a light-emitting device, where the pixel may be driven in a first or second frequency mode; and a gate driver circuit configured to supply at least one gate signal and at least one light emission control signal to the pixel. The light-emitting device may emit light by a driving current flowing from a first power voltage to a second power voltage in response to a data signal. The pixel may receive a reset signal having a voltage level less than a threshold voltage of the light-emitting device after the data signal is received while the display device is driven in the second frequency mode. The at least one light emission control signal may have a low voltage level at a portion of a period during which the at least one gate signal has a high voltage level.