LCD Timing Controller Frequency Conversion Error Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display (LCD) devices experience errors in the timing controller during frequency conversion, leading to the display of defective images due to unstable synchronizing signals.
Innovation Solution
An apparatus and method that include a graphic system generating frequency-conversion prediction information to control the timing controller, allowing it to prepare and display video data from a previous frame during frequency conversion, using internal clock signals to maintain image stability and prevent driver activation during unstable periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If frequency conversion is performed to reduce power consumption, then energy efficiency is improved, but timing controller errors occur due to unstable synchronizing signals
Solution Approach 1:
The timing controller predicts the frequency conversion timing in advance by detecting changes in synchronizing signal parameters (such as horizontal/vertical synchronizing signal periods) before the actual frequency conversion occurs. This allows the controller to prepare and maintain the previous frame image data during the conversion period, preventing display defects caused by unstable synchronizing signals while enabling power-saving frequency conversion.
2Adaptability or versatility
If synchronizing signals are modulated for frequency conversion, then frame frequency is changed, but image quality degrades due to signal instability
Solution Approach 1:
The timing controller uses the previous frame image data as an intermediary during frequency conversion. When synchronizing signals become unstable during frequency conversion, the controller continues to output the previous frame data instead of processing new unstable signals, thereby maintaining image quality while still allowing frequency conversion to occur.
Solution Approach 2:
The system detects and predicts frequency conversion timing in advance by monitoring synchronizing signal parameters. By identifying the conversion period before it occurs, the timing controller can switch to maintaining previous frame data proactively, ensuring image quality is preserved during the transition period when synchronizing signals are unstable.
3Use of energy by moving object
If frequency conversion is implemented, then power consumption is reduced, but defective images are displayed due to timing errors
Solution Approach 1:
The timing controller continuously monitors synchronizing signal parameters (such as horizontal synchronizing signal period and vertical synchronizing signal period) to detect changes indicating frequency conversion. This feedback mechanism allows the controller to identify when frequency conversion is occurring or about to occur, and accordingly switch to maintaining previous frame data to prevent defective image display while enabling power-saving operation.
Solution Approach 2:
By detecting changes in synchronizing signal parameters in advance, the timing controller predicts the frequency conversion timing before it occurs. This allows the controller to proactively switch to maintaining previous frame image data during the conversion period, preventing display defects while enabling power-consuming frequency conversion operation.
Data Source
AI summary
An apparatus and method for driving a liquid crystal display (LCD) device is disclosed, to prevent error of a timing controller and to prevent the defective image on a frequency conversion, the apparatus comprising a liquid crystal display part to display images, a driver to drive the liquid crystal display part, a graphic system to output frequency-conversion prediction information in accordance with a frequency-conversion signal, and perform frequency conversion of a plurality of synchronizing signals, and a timing controller to control the driver to display video data according to a previous frame during the frequency conversion, in response to the frequency-conversion prediction information.