Color Calibrating Circuit Voltage Distribution Adjustment

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Solution Overview

Problem

Display devices misjudge analog image signals due to signal attenuation and interference, leading to lengthened response time and the longitudinal ripple phenomenon caused by inaccurate gray-scale value representation.

Innovation Solution

A color calibrating method that analyzes and adjusts the voltage distributions of minimum and maximum brightness voltages to set target values, preventing signal misjudgment and enhancing image quality by using a color calibrating circuit with analyzing, adjusting, and detecting modules.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If analog color signals are transmitted through a transmission cable, then the display device can receive color signals, but signal attenuation and interference cause surge points that lead to misjudgment of gray-scale values

Engineering Contradiction:
Improvesignal transmission accuracyVSAvoidgray-scale value accuracy
Core Design Contradiction:
ReliabilityVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by adjusting the maximum and minimum voltage values of the color signal before the signal is transmitted through the cable. The timing controller pre-adjusts the voltage distribution to compensate for expected attenuation and interference, ensuring that even after signal degradation during transmission, the gray-scale values remain accurate when received by the display device.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by using a feedback module that detects the actual voltage distribution of the transmitted color signal and adjusts the maximum and minimum voltage values accordingly. This closed-loop control system continuously monitors signal quality and makes real-time corrections to maintain accurate gray-scale representation despite transmission losses.

Inventive Principle:
Principle #23Feedback

2Speed

If the maximum and minimum voltage values of color signals are not adjusted, then the transmission process is simple, but the response time is lengthened due to misjudged gray-scale values

Engineering Contradiction:
Improveresponse timeVSAvoidsignal processing complexity
Core Design Contradiction:
SpeedVSDevice complexity

Solution Approach 1:

The timing controller performs preliminary adjustment of voltage values before signal transmission, setting optimal maximum and minimum voltage levels in advance. This pre-processing ensures that the liquid crystal molecules receive correctly calibrated voltage signals, enabling fast response times without requiring complex real-time adjustment mechanisms during operation.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The system uses the existing timing controller to perform voltage adjustment functions, leveraging its built-in capabilities rather than adding separate dedicated adjustment circuits. This self-service approach maintains relatively simple device architecture while achieving the necessary voltage calibration for optimal response time.

Inventive Principle:
Principle #25Self-service

3Reliability

If the voltage distribution of color signals is not adjusted, then the device operation is simple, but longitudinal ripple phenomenon occurs due to inaccurate gray-scale representation

Engineering Contradiction:
Improvecolor display accuracyVSAvoidvoltage adjustment mechanism
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent adjusts the voltage distribution of color signals in advance before they reach the pixel electrodes. By pre-calibrating the maximum and minimum voltage values for each color channel (R, G, B), the system ensures accurate gray-scale representation that prevents longitudinal ripple phenomena, while keeping the adjustment mechanism integrated within the existing timing controller.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent applies different voltage adjustment parameters to different color channels (red, green, blue) based on their specific characteristics. The timing controller independently adjusts the voltage distribution for each color signal, applying local quality control to optimize the gray-scale representation for each color channel and prevent color-specific display artifacts.

Inventive Principle:
Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The method ensures accurate gray-scale representation, preventing response time elongation and the longitudinal ripple phenomenon, thereby enhancing image display quality and maintaining precise color output.

Implementation Method 1

A color calibrating mechanism in a display device is used to provide more accurate gray-scale values by analyzing voltage distributions

Methodology Applied
Scientific EffectVoltage distribution analysis:

Data Source

PatentUS8421826B2Color calibrating method, color calibrating circuit and display apparatus
Publication Date: 2013.04.16 INNOLUX CORP
  • US8421826B2 patent drawing
  • US8421826B2 patent drawing
  • US8421826B2 patent drawing

AI summary

A color calibrating method includes receiving a color signal wherein the color signal is associated with a set of minimum brightness voltages and a set of maximum brightness voltages, analyzing a distribution of the set of the minimum brightness voltages and a voltage distribution of the set of the maximum brightness voltages to obtain a first distribution curve and a second distribution curve, and adjusting a maximum value of the first distribution curve to a first target value and adjusting a maximum value of the second distribution curve to a second target value.