Reference Voltage Generator Feedback for Stable Display Gamma
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Solution Overview
Problem
Display devices face issues with undesired patterns and noise due to changes in driving voltage, which affect the display screen, primarily caused by resistance and capacitance variations in the display panel.
Innovation Solution
A reference voltage generator is introduced that converts sensing and reference driving voltages into currents, compares them, and generates first and second reference voltages based on their difference, which are then used to produce gamma voltages, thereby compensating for voltage changes and eliminating noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If driving voltage is increased to improve display brightness, then illumination intensity is improved, but noise and undesired patterns increase due to voltage changes
Solution Approach 1:
The patent implements a feedback mechanism where the sensing circuit continuously monitors the actual driving voltage applied to the display panel and feeds this information back to the reference voltage generator. This closed-loop feedback enables real-time detection and compensation of voltage variations, allowing the system to maintain stable display brightness while eliminating noise and undesired patterns caused by voltage fluctuations.
Solution Approach 2:
The patent dynamically adjusts the reference voltage parameter based on the sensed driving voltage conditions. By changing the reference voltage in response to detected voltage variations, the system compensates for the harmful effects of voltage changes while maintaining the desired display brightness level, thus resolving the contradiction between brightness and noise.
2Device complexity
If driving voltage changes are compensated slowly, then device complexity is reduced, but noise and patterns remain on display screen
Solution Approach 1:
The patent introduces a sensing circuit as an intermediary component that bridges the driving voltage source and the reference voltage generator. This intermediary circuit rapidly senses voltage changes and transmits this information for immediate compensation, enabling fast noise elimination without requiring complex compensation mechanisms. The sensing circuit acts as a simple yet effective mediator that speeds up the compensation process.
3Device complexity
If reference voltage is generated without noise filtering, then device complexity is reduced, but undesired patterns appear on display
Solution Approach 1:
The feedback mechanism in the patent inherently filters noise by continuously comparing the sensed driving voltage with the reference voltage and adjusting the reference voltage accordingly. This feedback-based noise filtering eliminates undesired patterns without requiring additional complex filtering circuits, as the compensation process itself acts as a noise-rejection mechanism.
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 rapidly compensates for changes in driving voltage, reducing noise and ensuring stable gamma voltages, thus improving the display quality by minimizing unwanted patterns and flicker on the screen.
Implementation Method 1
a first voltage-to-current converter converting a sensing driving voltage generated by measuring a driving voltage provided to a plurality of pixels into a sensing driving current
Implementation Method 2
a second voltage-to-current converter converting a preset reference driving voltage into a reference driving current
Implementation Method 3
a current-to-voltage converter generating a first reference voltage and a second reference voltage based on a difference between the sensing driving current and the reference driving current
Data Source
AI summary
Provided is a display device which comprises a display panel including a plurality of pixels displaying an image based on a driving voltage, a reference voltage generator converting a sensing driving voltage generated by measuring the driving voltage into a sensing driving current, converting a preset reference driving voltage into a reference driving current, comparing the sensing driving current and the reference driving current, and generating a first reference voltage and a second reference voltage based on a difference between the sensing driving current and the reference driving current, a gamma voltage generator generating a plurality of gamma voltages by dividing the first reference voltage and the second reference voltage, and a data driver converting image data into a data voltage based on the gamma voltages and providing the data voltage to each of the pixels.