Display Driving Circuit Transition Frame Generation for Flicker Reduction
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Solution Overview
Problem
When switching between different television standards, such as PAL and NTSC, the significant change in refresh frequency can cause screen flickering due to excessive differences in refresh frequencies, affecting the display quality.
Innovation Solution
A driving method and circuit that calculates and generates transition frames to smoothly adjust the refresh frequency between the two standards, reducing the difference in refresh frequencies between adjacent frames, thereby preventing flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the refresh frequency is directly switched between different television standards, then the switching speed is improved, but screen flickering occurs due to excessive difference in refresh frequencies
Solution Approach 1:
The direct frequency switching process is segmented into multiple stages by introducing transition frames. The frequency changes are divided into smaller increments across multiple frames rather than a single abrupt change, reducing the perceived flicker while maintaining reasonable switching speed.
Solution Approach 2:
Transition frames serve as an intermediary between the source frame and target frame with different refresh frequencies. These intermediate frames bridge the frequency gap, allowing smooth transition without direct switching that causes flickering.
2Reliability
If transition frames are generated to smooth frequency transition, then display stability is improved, but the complexity of the driving circuit increases
Solution Approach 1:
The driving circuit dynamically adjusts the refresh frequency based on the current frame type (source frame, transition frame, or target frame). The circuit transitions from a static fixed-frequency design to a dynamic variable-frequency design that adapts to different television standards and transition requirements.
Solution Approach 2:
The refresh frequency parameter is changed progressively through transition frames rather than abruptly. The circuit modifies the frequency parameter in controlled increments, and the timing control logic is adjusted to accommodate variable frame rates during the transition period.
3Loss of time
If the refresh frequency changes abruptly between standards, then the switching time is reduced, but screen flickering occurs affecting display quality
Solution Approach 1:
Instead of completing the full frequency transition in a single frame (excessive action causing flicker), the transition is distributed across multiple frames with partial frequency changes. Each transition frame implements a partial frequency adjustment, accumulating to the full transition over time, which prevents harmful flickering effects.
Data Source
AI summary
The present disclosure provides a driving method, a driving circuit, and a display device. The driving method includes steps of receiving a data signal of a first standard, generating a first data frame, and driving a display panel at a refresh frequency of the first data frame and receiving the data signal of the second standard, calculating and generating at least one transition frame according to the data signal of the first standard and the data signal of the second standard, and driving the display panel at a refresh frequency corresponding to the at least one transition frame. A refresh frequency of the at least one transition frame is between a refresh frequency of the first data frame and a refresh frequency of the second data frame.