Flat Display Panel Defect Compensation Circuit
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Solution Overview
Problem
Flat panel display devices suffer from panel defects such as brightness and color differences, which affect picture quality and product reliability, and existing methods primarily focus on process improvements rather than effective compensation during production.
Innovation Solution
A picture quality controlling method that measures brightness and color differences in panel defect locations, determines compensation values, and generates a compensated video signal to adjust the display, using a compensation circuit to drive the display panel and convert RGB data into YUV data for precise brightness and color adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If process improvements are implemented to reduce panel defects, then manufacturing quality improves, but it remains difficult to properly deal with panel defects generated in the improved process
Solution Approach 1:
The patent applies preliminary action by measuring brightness and color difference at defect locations during the test process, storing these measurements in advance, and using them to generate compensation values before actual display operation. This allows the system to pre-characterize defects and prepare compensation parameters, enabling effective handling of remaining defects even after process improvements.
Solution Approach 2:
The patent changes parameters by measuring actual brightness and color difference values at panel defect locations and using these measured parameters to generate compensation values. Instead of relying on theoretical or standardized compensation, the system adjusts compensation parameters based on actual measured deviations, enabling precise compensation for various defect types and shapes.
2Productivity
If panel defects are left unaddressed to maintain production speed, then productivity is maintained, but picture quality deteriorates and reliability drops
Solution Approach 1:
The patent applies self-service by enabling each display panel to compensate for its own defects through embedded compensation circuits that use stored compensation values. The system automatically adjusts brightness and color at defect locations without requiring manual intervention or rework, allowing defective panels to be shipped as-is while maintaining picture quality through electronic compensation.
Solution Approach 2:
The patent introduces an intermediary compensation circuit between the display panel and the viewer. This circuit measures defect characteristics, stores compensation values, and dynamically adjusts the display signal to compensate for panel defects. The intermediary system bridges the gap between imperfect manufacturing and high picture quality requirements, allowing both productivity and reliability to be maintained.
3Reliability
If compensation circuits are added to compensate for panel defects, then picture quality improves, but device complexity increases
Solution Approach 1:
The patent merges the compensation function with the existing display driver circuitry. The compensation circuit is integrated into the timing controller or data driver, sharing resources with the normal display operation. Compensation values are stored in memory that is also used for frame buffer storage, and the compensation process is combined with the video signal processing pipeline, reducing overall system complexity despite adding compensation functionality.
Data Source
AI summary
A flat panel display device may improve picture quality by compensating a panel defect by use of a circuit and a picture quality controlling method.A flat panel display device includes a display panel. A memory stores a location information and a compensation value for a panel defect location on the display panel. A first converter calculates a brightness and color difference signals from red, green, blue video signals to be displayed in the display panel. The first converter expands the number of data bits of the brightness signal to generate the expanded brightness signal. A compensating part generates a compensated brightness signal by increasing or decreasing the expanded brightness signal of the video signal to be displayed in the panel defect location. A second converter calculates the red, green, blue signals from the color difference signal and the compensated brightness signal, and generates the compensated video signal by reducing the number of bits of the calculated red, green, blue signals. A drive circuit drives the display panel by use of the compensated video signal and the uncompensated video signal.