Back-End Interface Voltage Compensation for 8K Display Noise
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Solution Overview
Problem
High-resolution displays like 8K suffer from deviations in output voltage levels due to external temperature changes, back-end setting variations, and differences in impedance between physical patterns, leading to image noise such as vertical bars.
Innovation Solution
A display device with a processor that senses input voltage, compares it to an initial set voltage, calculates a compensation value, and adjusts the DC/DC converter to maintain a constant output voltage level using a compensation table or temperature-dependent values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display resolution is increased to 8K, then the image quality is improved, but the deviation in VCM level increases causing image noise
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the VCM level compensation values based on temperature conditions and line characteristics. The processor modifies the voltage level parameters of the back-end interface to compensate for deviations, thereby maintaining stable image output even at 8K resolution where VCM level deviation would normally cause image noise
Solution Approach 2:
The patent implements feedback mechanisms where the processor continuously monitors the VCM level output from the back-end interface and compares it against reference values. Based on the detected deviations, the system adjusts compensation parameters and re-regulates the voltage levels, creating a closed-loop control system that maintains VCM level stability despite temperature variations and manufacturing tolerances
2Area of stationary object
If the physical pattern length is increased for larger displays, then the display size is improved, but the impedance difference between patterns increases causing VCM level deviation
Solution Approach 1:
The patent applies local quality by implementing line-specific compensation values for different source lines in the back-end interface. Each physical pattern is assigned individual compensation parameters based on its specific impedance characteristics and length, allowing localized adjustment of VCM levels to account for variations across different regions of the large display panel
Solution Approach 2:
The system dynamically adjusts electrical parameters (voltage levels, compensation values) for different physical patterns based on their specific characteristics. By changing the voltage parameters individually for each line or region, the system compensates for impedance differences caused by varying physical pattern lengths in large displays
3Measurement precision
If the number of source lines is increased for high-resolution displays, then the resolution is improved, but the VCM level deviation between lines increases
Solution Approach 1:
The patent segments the back-end interface into individual source line units, each with its own VCM level compensation mechanism. The processor handles each line separately, applying specific compensation values to each source line to correct deviations independently, thereby maintaining uniform VCM levels across all lines even when the total number of lines is increased for high resolution
4Adaptability or versatility
If the external temperature varies, then the operating environment is improved, but the VCM level deviation increases causing image noise
Solution Approach 1:
The patent implements temperature-based feedback control where the processor detects temperature conditions and adjusts VCM level compensation accordingly. The system uses temperature as a feedback parameter to dynamically modify voltage compensation values, maintaining stable VCM levels across varying external temperatures and preventing image noise caused by thermal effects
Solution Approach 2:
The system transitions from static VCM level settings to dynamic adjustment based on temperature conditions. The processor continuously adapts the voltage compensation parameters in response to temperature changes, making the back-end interface dynamically responsive to environmental conditions while maintaining reliable operation
Data Source
AI summary
A display device according to an embodiment of the present invention may comprise: a display panel; a back-end interface which transmits image data to the display panel; a memory which stores an initial setting voltage; and a processor which senses an input voltage output from a DC/DC converter and transmitted to the back-end interface, compares the sensed input voltage with the initial setting voltage, acquires a voltage compensation value on the basis of a result of the comparison, and transmits the acquired voltage compensation value to the DC/DC converter.