Parallel Sensing Line for Real-Time Threshold Voltage Compensation
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Solution Overview
Problem
In light emitting display apparatuses, the quality of the image output from light emitting display panels deteriorates over time due to changes in threshold voltages of driving transistors, especially when the apparatus is continuously used in a state that it is turned on, and existing methods fail to compensate for these changes effectively, particularly in black image mode where threshold voltage sensing is hindered.
Innovation Solution
A light emitting display panel configuration that includes a sensing line parallel to the gate line, allowing for simultaneous image output and threshold voltage sensing, with a sensing unit that supplies a reference voltage and converts sensing signals into data, enabling real-time compensation for threshold voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threshold voltage sensing is performed using existing methods in black image mode, then the apparatus can operate in black image mode, but threshold voltage sensing cannot be performed at one frame period while the apparatus is being driven
Solution Approach 1:
The patent divides the sensing function into a separate sensing line parallel to the gate line, allowing independent sensing operations. This segmentation enables threshold voltage sensing to occur simultaneously with image output without interfering with the black image mode operation, thus maintaining both reliable image quality and continuous sensing capability at one frame period
Solution Approach 2:
The sensing line acts as an intermediary component that enables threshold voltage sensing without disrupting the normal gate line operation. By introducing this intermediate sensing path, the system can perform sensing operations concurrently with image display, resolving the contradiction between maintaining black image mode reliability and achieving continuous sensing at full frame rate
2Duration of action of stationary object
If the apparatus is continuously used in a turned-on state, then continuous operation is maintained, but threshold voltage changes cannot be compensated and image quality deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where threshold voltage is continuously sensed through the parallel sensing line during operation. The sensed threshold voltage information is used to generate compensation values that are fed back to adjust the data voltages, ensuring image quality is maintained even during continuous operation. This closed-loop feedback system resolves the contradiction by enabling real-time compensation without interrupting continuous operation
Solution Approach 2:
The sensing line enables continuous threshold voltage sensing and compensation to occur throughout the entire operating period. By making the sensing action continuous rather than periodic or interruptive, the system maintains image quality compensation throughout continuous operation, eliminating the deterioration that occurs in conventional systems during extended use
3Measurement precision
If a sensing line is provided in parallel with the gate line, then real-time threshold voltage sensing is enabled, but device complexity increases
Solution Approach 1:
The patent combines the sensing function with the existing gate line structure by providing a sensing line in parallel. This merging approach allows threshold voltage sensing to be integrated into the existing display driving architecture without requiring completely separate sensing circuits, thus improving measurement precision while limiting the increase in device complexity to only the additional parallel line and associated control circuitry
Data Source
AI summary
A light emitting display panel and a light emitting display apparatus using the same are provided, in which a sensing line is provided in parallel with a gate line. The light emitting display panel comprises a data line provided along a first direction, a black line provided along the first direction, a first voltage supply line provided along the first direction, a gate line provided along a second direction different from the first direction, a sensing line provided along the second direction, a sensing control line provided along the second direction, a black control line provided along the second direction, a pixel driving circuit coupled with the data line, the black line, the first voltage supply line, the gate line, the sensing line, the sensing control line and the black control line, and a light emitting element coupled to the pixel driving circuit.