Display Panel Dummy Lines for Voltage Compensation
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Solution Overview
Problem
In liquid crystal display (LCD) apparatuses, the varying lengths of fan-out lines lead to different resistances, which reduce image quality due to uneven voltage distribution across the display panel.
Innovation Solution
The implementation of a display apparatus with first and second dummy lines connected to specific nodes, allowing a timing controller to compensate data signals based on node voltages, ensuring consistent voltage distribution across the panel by outputting data voltages through multiple data drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fan-out lines are used to connect data drivers to data lines, then data voltages can be supplied to the display panel, but varying lengths of fan-out lines cause different resistances that reduce image quality
Solution Approach 1:
The display panel is divided into multiple regions, each served by a separate data driver. The fan-out lines are segmented into different groups (first through n-th fan-out lines and (n+1)-th through m-th fan-out lines) with different data drivers, allowing independent control and compensation for each segment's resistance characteristics.
Solution Approach 2:
The timing controller dynamically adjusts data signal parameters (amplitude, timing) based on measured node voltages from dummy lines. By changing the electrical parameters of the data signals in real-time, the system compensates for resistance variations caused by different fan-out line lengths, ensuring uniform voltage distribution across all data lines.
2Manufacturing precision
If multiple data drivers are used to drive different regions of the display panel, then voltage distribution can be improved, but device complexity increases
Solution Approach 1:
Multiple data drivers are designed with standardized interfaces and control mechanisms. The timing controller provides unified management for all data drivers through common control signals, and the dummy lines follow a standardized configuration pattern. This universality reduces the practical complexity despite having multiple drivers.
Solution Approach 2:
Dummy lines are introduced as intermediary elements between the data drivers and the display panel. These dummy lines measure node voltages and feed this information back to the timing controller, which then adjusts data signals accordingly. This intermediary feedback mechanism simplifies the overall system by providing automatic compensation without requiring complex manual calibration.
3Manufacturing precision
If dummy lines are added to measure node voltages for compensation, then image quality can be improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The dummy lines are integrated into the existing display panel structure and serve the dual purpose of voltage measurement and compensation feedback. By using the same physical infrastructure (conductive paths, connection nodes) for both normal display operation and compensation measurement, the system achieves self-service functionality without adding separate dedicated measurement circuits.
Solution Approach 2:
The dummy lines create a feedback loop where node voltages are measured and fed back to the timing controller. This feedback mechanism automatically adjusts data signals to compensate for resistance variations. The feedback approach is more efficient than open-loop calibration methods, reducing the need for complex additional circuitry while improving image quality.
Data Source
AI summary
A display apparatus includes a display panel having fan-out lines, data lines, a first dummy line, and a second dummy line. The fan-out lines are sequentially disposed along a first direction. The data lines are connected to the fan-out lines at first through nodes. The first dummy line is connected to one of the nodes. The second dummy line is connected to another of the nodes. A first data driver is configured to output data voltages to some of the fan-out lines based on a data signal. A second data driver is configured to output voltages to other fan-out lines based on the data signal. A timing controller is configured to compensate the data signal based on a voltage of nodes that the dummy lines are connected to.