Gamma Voltage Adjustment in Display Drivers for Luminance Stability
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Solution Overview
Problem
Display devices experience changes in pixel driving voltage due to internal and external loads, leading to variations in pixel luminance, which existing technologies fail to adequately address.
Innovation Solution
A display device with a driver IC that includes a weight selector and gamma reference voltage generating unit to adjust the gamma voltage based on changes in pixel driving voltage, using a weight circuit to boost or reduce the voltage and generate reference voltages to stabilize luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel driving voltage is supplied to the display panel, then the pixels can be driven to display images, but the pixel driving voltage changes depending on load conditions causing luminance variations
Solution Approach 1:
The patent implements a feedback mechanism where the pixel driving voltage is monitored and used to dynamically adjust the gamma reference voltage. The gamma reference voltage generating unit receives the pixel driving voltage as input and generates an adjusted gamma reference voltage that compensates for voltage fluctuations, thereby maintaining consistent luminance despite load variations.
Solution Approach 2:
The patent changes the gamma reference voltage parameter based on the pixel driving voltage level. By dynamically adjusting the gamma reference voltage according to the actual pixel driving voltage, the system compensates for voltage fluctuations and maintains stable luminance output across different load conditions.
2Reliability
If gamma voltage is adjusted based on pixel driving voltage changes, then luminance variations are minimized, but the device complexity increases due to additional circuit components
Solution Approach 1:
The patent merges the gamma reference voltage generation function with the pixel driving circuitry. The gamma reference voltage generating unit is integrated into the existing display driver architecture, combining multiple functions into a unified circuit structure that reduces overall system complexity while achieving luminance stabilization.
Solution Approach 2:
The gamma reference voltage generating unit serves multiple functions: it generates the gamma reference voltage, adjusts it based on pixel driving voltage feedback, and compensates for luminance variations. This multi-functional design eliminates the need for separate compensation circuits, thereby reducing device complexity.
Data Source
AI summary
The display device includes a display panel including a plurality of pixels; a driver IC configured to convert digital data corresponding to an input image to an analog voltage using a gamma voltage, and to supply the analog voltage to the plurality of pixels; and a power supply configured to supply a pixel driving voltage to the display panel and the driver IC. The driver IC includes a weight selector configured to select a weight for adjusting the gamma voltage based on a change amount of the pixel driving voltage supplied from the power supply; and a gamma reference voltage generating unit configured to generate a gamma reference voltage based on the selected weight.