Display Panel Gamma Voltage Circuit for Low-Flicker Driving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display panel driving technologies face challenges in reducing power consumption and flicker noise in the low frequency section, as well as noise in general, which affect image quality and stability.
Innovation Solution
A driving device for a display panel incorporating a reference voltage generator, capacitor circuit, and gamma voltage generator to stabilize gamma voltages by compensating for variations in driving voltages, using capacitors to maintain constant charge levels and generate multiple gamma voltages based on maximum and minimum gamma signals, thereby reducing noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gamma voltage setting is used with DC-DC converter, then gamma voltage can be generated for each gray, but power consumption increases and flicker noise occurs in low frequency section
Solution Approach 1:
The patent extracts the DC-DC converter from the gamma voltage generation path and replaces it with a capacitor-based voltage storage and switching circuit. The converter is removed entirely, and its function is replaced by capacitors that store voltage and switches that select between different voltage levels, thereby eliminating the source of flicker noise and reducing power consumption while maintaining gamma voltage generation capability
Solution Approach 2:
The patent implements periodic charging of capacitors during horizontal blanking intervals when the display panel is not actively displaying images. This periodic action allows the capacitors to be recharged without affecting the ongoing display operation, enabling voltage stabilization during idle periods while maintaining continuous operation during active display periods
2Adaptability or versatility
If DC-DC converter is used for gamma voltage generation, then voltage can be converted and distributed, but flicker noise and general noise increase
Solution Approach 1:
The patent converts the periodic blanking intervals, which are normally idle time in display operation, into beneficial charging periods for the capacitors. This transforms what would be wasted time into an opportunity to recharge the voltage storage elements, thereby eliminating the need for continuous converter operation and reducing the harmful flicker noise while maintaining voltage conversion capability
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
The solution enables stable, high-quality image output by reducing noise and power consumption, ensuring consistent luminance and color accuracy across the display panel.
Implementation Method 1
The capacitor circuit may include a first end configured to receive an input of a first driving voltage or a second driving voltage, a second end configured to receive an input of a maximum gamma voltage, and a third end configured to receive an input of a minimum gamma voltage. The capacitor circuit may be configured to charge a first charge based on a voltage difference between the first driving voltage and the maximum gamma voltage and charge a second charge based on a voltage difference between the first driving voltage and the minimum gamma voltage
Data Source
AI summary
A driving device of a display panel includes a reference voltage generator, a capacitor circuit, and a gamma voltage generator. The reference voltage generator is configured to generate a maximum gamma voltage and a minimum gamma voltage. The capacitor circuit is configured to, response to receiving the first driving voltage, charge a first charge based on a voltage difference between a first driving voltage and the maximum gamma voltage and charge a second charge based on a voltage difference between the first driving voltage and the minimum gamma voltage. The capacitor circuit is configured to, in response to receiving a second driving voltage, output a first gamma reference voltage and a second gamma reference voltage. The gamma voltage generator is configured to generate a plurality of gamma voltages based on the first gamma reference voltage and the second gamma reference voltage.