Display Driver Module Voltage Calibration Circuit
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Solution Overview
Problem
Display panels in mobile devices experience image quality degradation due to changes in driving voltages caused by manufacturing errors or physical characteristics, leading to suboptimal performance.
Innovation Solution
A driver module with a driving voltage generator and calibration circuit that compares generated driving voltages to a reference voltage, determines calibration parameters, and adjusts the voltages to ensure accurate output, thereby maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the driver module combines with the display panel, then integration and compactness are improved, but driving voltage levels may change due to process error or physical characteristics, causing image quality degradation
Solution Approach 1:
The calibration circuit performs preliminary measurement and adjustment of driving voltage levels during the manufacturing process. By measuring actual voltage levels and storing calibration parameters before the display panel is shipped, the system pre-compensates for manufacturing variations, ensuring accurate image quality without requiring post-manufacturing adjustments.
Solution Approach 2:
The calibration circuit creates a feedback mechanism by measuring actual driving voltage levels, comparing them against target values, and generating calibration parameters that compensate for deviations. This feedback loop ensures that voltage level variations due to process errors or physical characteristics are corrected, maintaining image quality despite integration-related changes.
2Productivity
If driving voltage levels change due to process error or physical characteristics, then manufacturing variability is reflected, but image quality degrades
Solution Approach 1:
The calibration circuit enables the driver module to self-adjust its driving voltage levels by automatically measuring actual voltages, calculating calibration parameters, and applying corrections. This self-service capability eliminates the need for manual calibration processes, maintaining high manufacturing throughput while achieving precise voltage level control and consistent image quality.
3Measurement precision
If calibration circuit is added to measure and adjust driving voltages, then voltage accuracy is improved, but device complexity increases
Solution Approach 1:
The calibration circuit is merged with the existing driver module structure, sharing common components such as voltage generation circuits, control logic, and storage elements. By integrating calibration functions into the existing architecture rather than adding completely separate systems, the patent achieves accurate voltage measurement and adjustment while minimizing increases in overall device complexity.
Data Source
AI summary
A display panel includes a display module including a plurality of pixels connected to gate lines and source lines and a driver module configured to apply driving voltages to the gate lines and the source lines. The driver module includes a driving voltage generator configured to generate the driving voltages and a calibration circuit configured to compare each of the driving voltages with a reference voltage and to output a calibration parameter according to a comparison result. The driving voltage generator calibrates each of the driving voltages using the calibration parameter.