Boost Circuit Driving-Time Calibration for Display Gradation Voltage
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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 variations in source driver formation and load size across the display require calibration to supply desired gradation voltages effectively.
Innovation Solution
A method and device for calibrating the driving time of a boost circuit by resetting the load to a reference voltage, supplying a charging voltage, performing charge sharing, comparing the resulting voltage with a target voltage, and adjusting the driving time based on the comparison to ensure accurate gradation voltage delivery.
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 variations in source driver formation and load size across the display cause deviations in gradation voltage supply
Solution Approach 1:
The patent adjusts the driving time parameter of the boost circuit based on the position of the load within the display. By changing the driving time parameter according to position, the circuit compensates for variations in load characteristics and source driver formation, thereby maintaining accurate gradation voltage supply across the entire display area while operating at high speeds
Solution Approach 2:
The patent performs preliminary calibration of the boost circuit driving time for different positions before actual display operation. This preliminary action establishes the correct driving time parameters that account for manufacturing variations, enabling the system to maintain precision without requiring adjustment during normal high-speed operation
2Manufacturing precision
If the driving time of the boost circuit is extended to supply sufficient charging voltage, then the gradation voltage accuracy is improved, but the time required to drive the load increases
Solution Approach 1:
The patent optimizes the driving time parameter by adjusting it according to the specific position and load characteristics. This allows the system to use the minimum necessary driving time to achieve the required charging voltage for each position, avoiding unnecessary time extension while maintaining gradation voltage accuracy
Solution Approach 2:
The patent implements dynamic adjustment of the driving time parameter based on real-time or pre-calibrated position information. Rather than using a fixed extended driving time for all positions, the system dynamically adapts the driving time to match the specific requirements of each load position, thereby achieving accuracy without excessive time loss
Data Source
AI summary
A method of calibrating a boost circuit includes: resetting a load to a reference voltage; supplying a charging voltage to the load through a boost circuit for a driving time such that charge sharing is performed in the load; comparing a voltage of the load after the charge sharing with a target voltage; and adjusting a duration of the driving time according to a result of the comparing.