Display Driving Circuit Voltage Difference Control
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Solution Overview
Problem
Existing driving circuits for liquid crystal display panels face issues with voltage drops and increased ripple voltage under heavy loading conditions, causing the voltage difference between data driving voltage (VAA) and gamma voltage (GAMMA) to approach zero, leading to abnormal image display and potential overheating.
Innovation Solution
A driving circuit comprising a source driving chip, a timing controller, and a power management circuit chip that monitors and adjusts the voltage difference between VAA and GAMMA voltages, using a voltage comparator and voltage calibrating module to ensure the voltage difference remains within a predetermined range, thereby preventing voltage drops and overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the display panel operates under heavy loading conditions, then the driving current increases to meet the high current demand, but the data driving voltage VAA encounters significant voltage drop due to load draining
Solution Approach 1:
The patent implements a feedback mechanism where the source driving chip continuously monitors the voltage difference between VAA and GAM1 voltages. When the voltage difference falls outside the predetermined range, the system automatically adjusts the VAA voltage through the Power Management IC to maintain it within the acceptable range, thereby resolving the voltage drop issue under heavy loading conditions
Solution Approach 2:
The patent dynamically adjusts the VAA voltage parameter based on the monitored voltage difference. By changing the VAA voltage level in response to loading conditions, the system maintains the voltage difference between VAA and GAM1 within the predetermined range, ensuring stable operation under varying current demands
2Reliability
If the voltage difference between VAA and GAM1 is maintained within a reasonable range, then the display quality is preserved, but the temperature of the output buffer may exceed the acceptable range
Solution Approach 1:
The patent employs dynamic adjustment of the VAA voltage based on real-time monitoring of the voltage difference. This dynamic control allows the system to maintain display quality by keeping the voltage difference within the predetermined range while simultaneously preventing excessive temperature rise in the output buffer by adjusting voltage levels according to actual operating conditions
3Reliability
If additional monitoring and adjustment mechanisms are added to the driving circuit, then the voltage difference can be maintained within the predetermined range, but the device complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where the source driving chip autonomously monitors the voltage difference between VAA and GAM1 voltages and generates adjustment signals when necessary. This self-monitoring and self-adjusting capability eliminates the need for external complex control circuits, maintaining system reliability while minimizing additional device complexity
Solution Approach 2:
The patent integrates the voltage monitoring and adjustment functions directly into the existing source driving chip and Power Management IC. By merging these control functions with the existing driving circuitry rather than adding separate dedicated circuits, the system achieves reliable voltage difference control without significantly increasing overall device complexity
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 solution ensures stable voltage differences, preventing abnormal image display and overheating, while maintaining normal operation of large-scale display panels without the need for additional hardware-designed circuits or increased manufacturing costs.
Implementation Method 1
The source driving chip determines whether a voltage difference between the data driving voltage and the gamma voltage is within a predetermined range
Data Source
AI summary
A driving circuit, a driving method and a display device are provided. The driving circuit is used to driving a display panel. The driving circuit includes at least one source driving chip, a timing controller and a power management circuit chip. The power management circuit chip outputs a data driving voltage and a gamma voltage to the at least one source driving chip. The source driving chip determines whether a voltage difference between the data driving voltage and the gamma voltage is within a predetermined range. Based on a result of the determination, the driving circuit decides whether to adjust the driving voltage and the gamma voltage.