Display Driving Circuit Voltage Deviation Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In organic light emitting display devices, the variation in driving voltage across different positions of the display panel leads to uneven luminance of subpixels, degrading image uniformity and quality, as the pulse width adjustment for gate clock to compensate for voltage deviation can further increase luminance deviations, especially at lower luminance levels.
Innovation Solution
A display device with a driving circuit and method that includes multiple driving voltage feedback lines to detect voltage deviations across the panel, using a differential amplifier circuit and analog-to-digital converter to generate a digital signal for compensating image data based on these deviations, ensuring consistent voltage supply to subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pulse width of the gate clock is changed to compensate for driving voltage deviation, then the driving voltage uniformity is improved, but the luminance uniformity deteriorates especially at low luminance levels
Solution Approach 1:
The patent implements a feedback mechanism by detecting the actual driving voltage at multiple positions in the display panel using sensing circuits, comparing these voltages with reference values, and generating compensation values based on the detected deviations. This closed-loop feedback system allows real-time adjustment without the side effects of gate clock pulse width modification.
Solution Approach 2:
The patent changes the parameter being adjusted from gate clock pulse width to data voltage compensation values. By modifying the data voltage based on detected driving voltage deviations, the system achieves voltage uniformity compensation without affecting the gate clock timing, thereby avoiding luminance uniformity deterioration.
2Device complexity
If driving voltage is transmitted from a power management circuit located on one side of the display device, then the device structure is simplified, but the driving voltage decreases as the distance from the power management circuit
Solution Approach 1:
The patent segments the driving voltage detection into multiple positions across the display panel by providing sensing circuits at different locations. This allows independent measurement and compensation of voltage deviations at each segment, addressing the voltage drop issue without requiring a complex distributed power supply architecture.
Solution Approach 2:
The patent introduces sensing circuits and compensation circuits as intermediary components between the power management circuit and the display panel. These intermediaries detect voltage deviations and generate compensation signals that adjust the driving voltage, effectively bridging the gap caused by distance-related voltage drops.
3Measurement precision
If multiple driving voltage feedback lines are added to detect voltage deviations at multiple positions, then the voltage detection precision is improved, but the device complexity increases
Solution Approach 1:
The patent makes existing circuit structures serve multiple functions. The data lines and gate lines are used not only for their primary functions but also as pathways for voltage sensing and compensation signal transmission. This multi-functionality allows voltage detection at multiple positions without adding dedicated feedback lines for each sensing point.
Solution Approach 2:
The patent merges the voltage sensing function with existing data and gate lines. By combining multiple functions into existing circuit structures, the system achieves multi-position voltage detection capability without proportionally increasing the number of dedicated feedback lines, thus reducing overall structural complexity.
Data Source
AI summary
Embodiments of the present disclosure relate to a display device, comprising: a display panel in which a plurality of driving voltage feedback lines branched from a driving voltage line for supplying a driving voltage to a plurality of subpixels are disposed; a driving circuit for supplying a data voltage to the plurality of subpixels and determining a deviation of a feedback driving voltage detected through the plurality of driving voltage feedback lines; and a timing controller for compensating for image data depending on positions at which the plurality of driving voltage feedback lines are branched in the display panel based on the deviation of the feedback driving voltage, and supplying a compensated image data to the driving circuit.