Clock Phase Adjustment for Display Stain Compensation
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Solution Overview
Problem
Display devices face challenges in maintaining uniform charging rates across pixels, leading to reduced image quality due to differences in slew rates, which can result in display stains, particularly affected by varying ambient temperatures among data driving circuits.
Innovation Solution
A data driving circuit with a clock generating and compensating circuit that detects the slew rate of data signals and adjusts the phase of the clock signal, advancing it when the detected slew rate is lower than a reference level to compensate for differences in charging rates, thereby ensuring uniform pixel charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the data signal is provided to multiple data lines simultaneously, then the display device can maintain high resolution and image quality, but differences in slew rates among data lines cause non-uniform pixel charging rates leading to display stains
Solution Approach 1:
The patent applies local quality by adjusting the phase of the clock signal for each data line individually based on its specific slew rate characteristics. The clock generating and compensating circuit detects the slew rate of each data line and provides a customized phase adjustment, ensuring that each data line charges its connected pixels uniformly without causing display stains.
Solution Approach 2:
The patent changes the phase parameter of the clock signal to compensate for slew rate variations. By detecting the slew rate of data signals on each data line and adjusting the clock phase accordingly, the system optimizes the charging rate of pixels to maintain uniformity across all pixels, preventing display stains.
2Manufacturing precision
If the clock signal phase is adjusted to compensate for slew rate variations, then pixel charging uniformity is improved, but the complexity of the clock generating and compensating circuit increases
Solution Approach 1:
The patent implements feedback by using the detected slew rate information to adjust the clock signal phase. The clock generating and compensating circuit continuously monitors the slew rate of data signals and dynamically adjusts the clock phase to maintain optimal pixel charging uniformity, creating a closed-loop control system that compensates for variations without requiring complex external calibration.
Data Source
AI summary
A display device having a charging compensation circuit to reduce/eliminate display stains based on pixels being charged at unequal charging rates. A data driving circuit of a display device includes an output circuit for converting an image signal into a data signal in response to a clock signal, and providing the data signal to a plurality of data lines, and a clock generating and compensating circuit for receiving a main clock signal and generating the clock signal, wherein the clock generating and compensating circuit detects a slew rate of the data signal provided to at least one of the plurality of data lines, and adjusts a phase of the clock signal depending on the detected slew rate.