LCD Frame Scan Timing Sequence Control for Power and Flickering
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Solution Overview
Problem
Liquid crystal display (LCD) panels face issues with power consumption and flickering at different refresh rates, as high refresh rates consume more power while low refresh rates lead to image instability and brightness differences.
Innovation Solution
A method and device for controlling a timing sequence in LCD panels by adjusting the frame scan timing sequence, which includes an active and blanking period, where the active period increases as the frame rate decreases, and the blanking period remains constant across different frame rates, ensuring stable image display and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the refresh rate is increased to improve image stability, then image stability is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the active period variable according to the refresh rate. The active period is extended at lower refresh rates and reduced at higher refresh rates, creating a dynamic timing sequence that adapts to different operating conditions. This resolves the contradiction by optimizing power consumption at low refresh rates while maintaining image stability through sufficient active period even at high refresh rates.
Solution Approach 2:
The patent changes the timing parameters (active period and blanking period) based on refresh rate. Specifically, the active period is adjusted to be longer at lower refresh rates to maintain liquid crystal capacitor charge, while the blanking period remains constant. This parameter adaptation resolves the contradiction between power consumption and image stability across different refresh rates.
2Use of energy by moving object
If the refresh rate is decreased to reduce power consumption, then power consumption is reduced, but image flickering increases
Solution Approach 1:
The patent makes the active period dynamic, extending it at lower refresh rates to ensure sufficient charging time for the liquid crystal capacitor. This dynamic adjustment prevents flickering by maintaining adequate charge even when the refresh rate is reduced for lower power consumption.
Solution Approach 2:
The patent applies preliminary action by extending the active period in advance at lower refresh rates to ensure the liquid crystal capacitor is fully charged before the frame is displayed. This preventive measure ensures image stability is maintained from the outset, avoiding flickering that would otherwise occur at low refresh rates.
3Illumination intensity
If the active period is extended to maintain image brightness at low refresh rates, then image brightness is maintained, but the total frame time increases
Solution Approach 1:
The patent changes the timing parameters by extending the active period only when necessary (at lower refresh rates) while keeping the blanking period constant. This selective parameter adjustment maintains image brightness when needed without unnecessarily increasing total frame time at higher refresh rates where the standard timing suffices.
Data Source
AI summary
Embodiments of the present disclosure provide a method and a device for controlling a timing sequence, a drive circuit, a display panel, and an electronic apparatus. In this method, a frame scan timing sequence for a display signal may be set according to a frame rate of the display signal, wherein the frame scan timing sequence includes an active period and a blanking period. The frame scan timing sequence may be arranged to increase the active period as the frame rate of the display signal decreases.