Display Timing Correction for Signal Propagation Delay
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Solution Overview
Problem
Display non-uniformity occurs due to waveform deformation of scanning line signals in display apparatuses, leading to luminance and color inconsistencies across pixels, caused by resistive and capacitive components in scanning lines, resulting in propagation delays and timing discrepancies.
Innovation Solution
A display apparatus with a timing control unit that adjusts the output timing of data line signals relative to scanning line signals, using first and second correction times to account for propagation delays, ensuring accurate voltage supply to pixels, thereby reducing display non-uniformity without increasing manufacturing complexity or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If timing correction is applied to reduce display non-uniformity, then display uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction times for each data line in a lookup table before operation. The timing control unit simply retrieves the appropriate correction time based on which data line is being driven, rather than performing complex real-time calculations. This reduces operational complexity while maintaining display uniformity through timing correction.
Solution Approach 2:
The patent segments the timing correction function by applying different correction times to different data lines individually. Each data line has its own specific correction time stored in the lookup table, allowing precise correction for each line's propagation delay characteristics without affecting other lines. This segmented approach enables targeted correction while keeping the overall system manageable.
2Manufacturing precision
If timing correction is applied to reduce display non-uniformity, then display uniformity is improved, but manufacturing cost increases
Solution Approach 1:
The correction times for all data lines are determined and stored in a lookup table during the manufacturing process, before the display device is deployed. This preliminary characterization of propagation delays allows the device to achieve uniform display performance without requiring complex real-time measurement or adjustment circuitry, thereby reducing manufacturing complexity and cost while maintaining display uniformity.
3Ease of operation
If scanning line signal propagates through resistive and capacitive components, then pixel selection is achieved, but waveform deformation occurs causing luminance non-uniformity
Solution Approach 1:
The patent creates a model or copy of the propagation delay characteristics for each data line by measuring and storing the correction time in a lookup table during manufacturing. This copied information about the electrical characteristics is then used during operation to compensate for waveform deformation, allowing the system to achieve uniform luminance without modifying the physical scanning line circuitry.
Data Source
AI summary
A display apparatus comprises: a display panel; a scanning line drive unit; a plurality of data line drive units to output a data line signal to target data lines; and a timing control unit. A first correction time is set individually for each data line drive unit and a second correction time is set individually for each target data line. The timing control unit transmits the image signal to each data line drive unit, with a delay by the first correction time from a transmission start time for a group of pixels lined up in a row direction based on a first clock signal, and each data line drive unit outputs the data line signal with a delay by the second correction time from an output reference time for target pixels being connected to the target data lines based on a second clock signal synchronized with the first clock signal.