Display Driver Light-Emission Timing for Variable Frame Rates
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Solution Overview
Problem
Emissive display devices face challenges in maintaining image quality when operating in variable frequency modes due to mismatched frame rates and light emitting cycles, leading to potential flicker phenomena.
Innovation Solution
A display device with a driving controller that adjusts the light emitting cycle periods and duty ratios based on frame rate variations, using a data converting block and a light emitting control block to synchronize image data output with display synchronization signals, ensuring alignment of light emitting cycles with frame periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device operates in variable frequency mode with mismatched frame rates and light emitting cycles, then the device can support variable frame rates, but flicker phenomena occur and image quality deteriorates
Solution Approach 1:
The light emitting cycle is made dynamic by adjusting its period based on the current frame rate. The controller modifies the light emitting cycle duration to match the display period of the current frame section, allowing the system to adapt to variable frame rates while maintaining synchronization and preventing flicker phenomena.
Solution Approach 2:
The period of the light emitting cycle is changed as a parameter to match the display period. By calculating the difference between the light emitting cycle period and the display period, and adjusting the light emitting cycle period accordingly, the system maintains proper synchronization across different frame rates.
2Device complexity
If the light emitting cycle period is fixed, then the light emitting control is simple, but it cannot synchronize with variable frame rates causing image quality degradation
Solution Approach 1:
The light emitting cycle period transitions from a fixed value to a dynamic value that changes based on the frame rate. The controller adjusts the light emitting cycle period in real-time to match the display period, enabling precise synchronization without overly complicating the control mechanism.
3Ease of operation
If the light emitting cycle does not align with frame periods, then the control is simpler, but flicker phenomena occur reducing image quality
Solution Approach 1:
The controller uses feedback by calculating the difference between the light emitting cycle period and the display period. Based on this difference, it adjusts the light emitting cycle period to achieve alignment, thereby eliminating flicker phenomena while maintaining relatively simple control 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
Prevents or reduces flicker phenomena by aligning light emitting cycles with frame periods, thereby improving image quality and stability in variable frequency operations.
Implementation Method 1
An emissive display device displays an image by using a light emitting diode that generates light through the recombination of electrons and holes
Data Source
AI summary
A display device includes a display panel and a display driver circuit. The display driver circuit includes a driving controller configured to receive an image signal at a variable frame rate, and output image data obtained through by converting of the image signal in response to a synchronization signal. The driving controller includes a light emitting control block. The light emitting control block compares a reference period of a reference cycle section of a light emitting cycle of the display panel, which is preset, with a display period of the present frame section, changes the reference period to an adjusted period depending on a comparison result, and outputs a driving control signal for controlling the display panel to emit light during an adjusted cycle section in which the display panel has the adjusted period from a starting time point of a next frame section.