LCD Panel Pulse Signal Waveform Correction Circuit
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Solution Overview
Problem
Existing methods for cell testing in LCD panels, such as the shorting bar method, often result in distorted voltage pulse signals due to impedance issues, leading to errors in operator detection and equipment automatic detection, causing image abnormalities and inefficiencies in quality control.
Innovation Solution
A detecting method and circuit that real-time monitors the waveform of pulse detecting signals, compares them to predetermined parameters, corrects any distortions, and inputs the corrected signal to the LCD panel, ensuring accurate detection and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a shorting bar method is used to supply voltage pulse signals for cell testing, then the testing process can be performed, but the voltage pulse signals become distorted due to impedance issues, causing detection errors
Solution Approach 1:
The patent implements a feedback mechanism where the actual voltage pulse signal waveform is detected and compared with a standard waveform. The detection result feeds back to control the pulse signal generation, allowing real-time adjustment to compensate for impedance-induced distortions and ensure accurate pixel activation during cell testing.
Solution Approach 2:
The patent performs preliminary detection of the voltage pulse signal waveform before using it for cell testing. By detecting and verifying the waveform in advance, the system ensures that only properly formed pulses are used for testing, preventing detection errors caused by distorted signals.
2Device complexity
If voltage pulse signals are generated without waveform detection, then the testing process is simpler, but pixels cannot be certainly lit up, resulting in operator detection errors
Solution Approach 1:
The patent adds a feedback loop where the voltage pulse signal waveform is detected and compared with a standard waveform. This feedback mechanism ensures that only correctly formed pulses are used for testing, significantly improving detection reliability while maintaining reasonable system complexity through automated comparison and control.
3Device complexity
If impedance is not compensated in the voltage pulse signal path, then the circuit is simpler, but signal distortion occurs, causing automatic detection equipment errors
Solution Approach 1:
The patent implements feedback-based impedance compensation by detecting the actual voltage pulse waveform and using this information to adjust the pulse generation. This approach compensates for impedance effects without requiring complex pre-calculated compensation circuits, maintaining circuit simplicity while improving automatic detection accuracy.
Data Source
AI summary
A detecting method and a detecting circuit of a LCD panel are provided. The method includes steps of: a detecting module in real time detecting a waveform of a pulse detecting signal inputted into the LCD panel; providing a feedback of the waveform of the pulse detecting signal to a pulse output module; determining whether the waveform of the pulse detecting signal is deformed by the pulse output module; correcting the pulse detecting signal by the pulse output module if the waveform of the pulse detecting signal is determined to be deformed; inputting a corrected pulse detecting signal to the LCD panel to detect the LCD panel. The disclosure prevents from abnormal display panel images resulted from a shorting bar lit-up method, reduces over checking or missing, and find out defects quickly and correctly by operators or detecting equipment to enhance quality and benefits and to reduce cost.