Gamma Voltage Compensation Circuit for Uniform Display Luminance
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Solution Overview
Problem
Display devices experience voltage drop phenomena in driving voltage, leading to luminance non-uniformity and increased power consumption due to varying luminance across different areas of the display panel.
Innovation Solution
A gamma voltage compensation circuit is employed, which includes a feedback driving voltage generating circuit and a reference voltage conversion circuit to generate high and low reference voltages based on feedback driving voltages, compensating for voltage drops by supplying these voltages through multiple lines to a reference gamma voltage generating circuit and ultimately to the data driving circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single driving voltage is supplied to the display panel, then the circuit structure is simple, but voltage drop occurs causing luminance non-uniformity
Solution Approach 1:
The patent divides the single driving voltage supply into multiple voltage lines (first voltage line and second voltage line) that separately supply voltages to different regions of the display panel. This segmentation allows independent voltage control for different areas, compensating for voltage drops and achieving uniform luminance across the panel.
Solution Approach 2:
The patent applies different driving voltages to different regions of the display panel based on their specific requirements. The first voltage line supplies voltage to a first region while the second voltage line supplies voltage to a second region, allowing each region to receive the optimal voltage level for uniform luminance display.
2Manufacturing precision
If voltage drop compensation is implemented, then luminance uniformity is improved, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts the driving voltages supplied through the first and second voltage lines based on the actual voltage drops detected in different regions. This dynamic adjustment allows the system to compensate for voltage drops while minimizing unnecessary power consumption by only increasing voltage where needed.
Solution Approach 2:
The patent incorporates feedback mechanisms to monitor voltage drops in real-time and adjust the driving voltages accordingly. By using feedback information about actual voltage conditions, the system can precisely compensate for voltage drops without excessive power consumption, optimizing the balance between luminance uniformity and energy efficiency.
Data Source
AI summary
Embodiments of the present disclosure relate to relate to a display device and a driving method of a display device. More specifically, a gamma voltage compensation circuit for supplying the high reference voltage and the low reference voltage to a reference gamma generating circuit may be electrically connected to a display panel through a first voltage line and a second voltage line, thereby compensating a voltage drop phenomenon of a driving voltage VDD.