Display Luminance Compensation Using Data Voltage Feedback
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Solution Overview
Problem
Display devices experience luminance differences between driving regions due to varying distances of data driving integrated circuits from the gamma driver, leading to visible boundary lines in the output image.
Innovation Solution
A display device with a feedback transmission line connected to data lines, an analog-to-digital converter, and a BLVDS line to sense data voltage changes, allowing the timing controller to adjust image data and gamma reference voltages to maintain consistent luminance across regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple data driving integrated circuits are used to drive different regions of the display panel, then the display area is increased, but luminance differences occur between driving regions due to varying distances from the gamma driver
Solution Approach 1:
The patent implements a feedback mechanism where data voltages from each data driving integrated circuit are sensed through feedback transmission lines, converted to digital signals by ADCs, and transmitted to the timing controller. The timing controller uses this feedback information to adjust image data and gamma reference voltages, compensating for luminance differences between driving regions and achieving uniform display across the entire display area.
Solution Approach 2:
The patent dynamically adjusts electrical parameters (image data and gamma reference voltages) based on the sensed data voltages from different driving regions. By changing these parameters compensatorily, the system maintains uniform luminance across regions that are at different distances from the gamma driver, resolving the luminance non-uniformity issue while preserving the expanded display area.
2Manufacturing precision
If feedback transmission lines and ADCs are added to each data driving integrated circuit, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent makes the data transmission lines serve dual functions: they transmit image data from the timing controller to the data driving integrated circuits during normal operation, and they also function as feedback transmission lines to carry data voltage information back to the timing controller. This multi-functionality reduces the need for separate dedicated feedback lines, thereby limiting the increase in device complexity while achieving luminance uniformity.
3Manufacturing precision
If data voltages are sensed and adjusted in real-time, then luminance uniformity is improved, but manufacturing cost increases
Solution Approach 1:
The patent reuses existing data transmission lines and BLVDS communication interfaces for dual purposes (data transmission and feedback). By leveraging already-present infrastructure rather than adding completely new components, the patent reduces the manufacturing cost increase that would otherwise result from real-time sensing and adjustment capabilities.
Data Source
AI summary
The present disclosure relates to a display device, and more specifically, to a display device in which the formation of a boundary line caused by a luminance difference in an output image can be prevented by controlling image data output from a timing controller to a data driver or gamma reference voltages output from a gamma driver to the data driver based on data voltages output from the data driver.