Timing Controller Reduces Flicker via Dynamic Data Inversion

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Solution Overview

Problem

Conventional TFT-LCD panels experience flicker due to the kick-back effect caused by parasitic capacitors, which worsens with certain image patterns, making exact compensation of the common voltage offset difficult across different panels and positions.

Innovation Solution

A timing controller is implemented with line and frame pattern detectors to dynamically adjust the data inversion method based on detected image patterns, using adders, subtractors, and polarity detection blocks to generate a polarity control signal, thereby reducing flicker by optimizing the data inversion process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a fixed data inversion method is used to drive the display panel, then the driving method is simple and easy to implement, but flicker occurs due to the kick-back effect from parasitic capacitors when certain image patterns are displayed

Engineering Contradiction:

Improvesimplicity of driving methodVSAvoidflicker

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent applies the dynamics principle by transitioning from a fixed data inversion method to a dynamic one that adapts based on detected image patterns. The timing controller continuously monitors the displayed image content and adjusts the data inversion strategy in real-time, changing the polarity of data signals based on whether the current image pattern is prone to causing kick-back effects. This dynamic adaptation eliminates flicker while maintaining driving simplicity.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback by introducing image pattern detection into the driving loop. The timing controller detects the current image pattern, evaluates whether it is susceptible to kick-back effects, and uses this information to adjust the data inversion method accordingly. This closed-loop feedback mechanism allows the system to automatically respond to image content changes and prevent flicker without requiring manual intervention or complex hardware modifications.

Inventive Principle:

Principle #23Feedback

2Reliability

If variable resistance is used to compensate for common voltage offset, then some compensation is achieved, but exact compensation is difficult because the offset voltage changes according to panel type and pixel position

Engineering Contradiction:

Improvecommon voltage stabilityVSAvoidcompensation accuracy across different panels

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by addressing the kick-back effect at its source - the data signal polarity - rather than attempting global compensation of the common voltage. Instead of trying to uniformly adjust the common voltage across the entire panel (which fails due to position-dependent offset variations), the method locally inverts data signal polarity in response to specific image patterns, effectively compensating for kick-back effects at each pixel location without requiring panel-specific calibration.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the parameter being controlled from common voltage level to data signal polarity. Rather than attempting to maintain a fixed common voltage value through resistance adjustment, the system maintains voltage stability by dynamically changing the polarity parameter of data signals based on image content. This parameter transformation bypasses the need for precise voltage compensation while achieving the same practical effect of eliminating flicker.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the same image pattern that coincides with the data inversion method is continuously input, then the data inversion method appears effective, but the kick-back effect is increased and flicker becomes worse

Engineering Contradiction:

Improvedisplay stabilityVSAvoidkick-back effect

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent directly applies inversion by reversing the data signal polarity when image patterns prone to causing kick-back effects are detected. Instead of maintaining a fixed inversion pattern, the system inverts data polarity dynamically in response to image content, using the inversion mechanism itself to counteract the harmful kick-back effect. This inverted approach transforms the data inversion method from a potential source of flicker into the solution that eliminates it.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS7965286B2Timing controller to reduce flicker and method of operating display device including the same

Publication Date: 2011.06.21 SAMSUNG ELECTRONICS CO LTD

AI summary

A timing controller to reduce a flicker in a display device is provided. The timing controller includes a line pattern detector and a frame pattern detector. The line pattern detector divides received data into a plurality of unit blocks and detects a line polarity of each of a plurality of horizontal lines included in each of the unit blocks. The frame pattern detector generates a polarity control signal to control a data inversion method based on a frame image pattern detected based on line polarities of the respective horizontal lines.