Boost Circuit Driving-Time Calibration for Display Voltage Accuracy
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Solution Overview
Problem
As display area and frame rate increase, the need for a boost circuit to drive loads, including pixels, at high speeds arises, but existing methods struggle to calibrate the boost circuit effectively due to variations in resistance and capacitance, leading to deviations in output voltage.
Innovation Solution
A method involving resetting the load to a reference voltage, supplying a charging voltage through the boost circuit for a calibrated driving time, comparing the resulting voltage with a target voltage, and adjusting the driving time accordingly to ensure accurate gradation voltage supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a boost circuit is used to drive loads at high speeds in large-area displays, then the driving speed and frame rate are improved, but the output voltage deviates from the target voltage due to process variations and load changes
Solution Approach 1:
The patent implements a feedback mechanism by comparing the actual output voltage of the boost circuit with the target voltage and adjusting the driving time accordingly. The calibration unit measures the output voltage after the boost circuit charges the load, compares it with the target voltage, and modifies the driving time in subsequent operations to compensate for deviations, thereby maintaining voltage accuracy despite process variations and load changes.
Solution Approach 2:
The patent changes the driving time parameter of the boost circuit based on calibration results. By adjusting the duration for which the boost circuit operates, the system compensates for voltage deviations caused by process variations and load changes, ensuring that the output voltage matches the target voltage while maintaining high-speed driving capability.
2Measurement precision
If the driving time of the boost circuit is extended to supply sufficient charging voltage, then the target gradation voltage is achieved, but the calibration process becomes complex due to variations in resistance and capacitance
Solution Approach 1:
The calibration unit performs self-calibration by automatically measuring the output voltage, comparing it with the target voltage, and adjusting the driving time without requiring external intervention. This self-service approach simplifies the calibration process despite variations in resistance and capacitance, as the system autonomously adapts to its specific characteristics through iterative measurement and adjustment.
3Productivity
If the display area and frame rate are increased, then the resolution and performance are improved, but the resistance and capacitance of the load increase requiring longer charging time
Solution Approach 1:
The patent makes the driving time dynamic by adjusting it based on calibration results. Instead of using a fixed charging time, the system determines the optimal driving time through calibration that accounts for the specific load characteristics of large-area displays, enabling the boost circuit to charge the increased capacitance efficiently while maintaining high frame rates.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for precise calibration of the boost circuit's driving time, enabling the supply of target gradation voltages to loads, even with varying resistance and capacitance, thereby improving the display's performance and accuracy.
Implementation Method 1
a boost circuit configured to supply a charging voltage to the load including the pixels
Implementation Method 2
comparing a voltage of the load after the charge sharing with a target voltage
Data Source
AI summary
A display device for displaying an image, includes: a data line driver which includes a buffer configured to supply a reference voltage to a load including pixels and a boost circuit configured to supply a charging voltage to the load including the pixels; and a calibration unit which controls the boost circuit to supply the charging voltage to the load for a driving time and controls the driving time according to a difference between a target voltage and a voltage formed after charge sharing is performed in the load to which the charging voltage is supplied.