Display Device Gate Clock Signal Recovery Mechanism

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Solution Overview

Problem

Display devices often display abnormal images due to abnormally outputted on-clock and off-clock signals caused by malfunctions, such as static electricity or electrical surges, leading to incorrect gate clock signals.

Innovation Solution

A display device with a power supply voltage generator that detects abnormal gate clock signals by comparing the activation periods of on-clock and off-clock signals, adjusts the count values of these signals to correct the gate clock signal, and includes a calculator to determine the reference time and a comparator to generate a clock recovery signal for correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the gate clock signal is generated based on on-clock and off-clock signals without detection mechanism, then the device complexity is reduced, but the reliability deteriorates due to abnormal signals causing display defects

Engineering Contradiction:
Improvegate clock signal reliabilityVSAvoidsignal detection and correction mechanism
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by calculating the gate clock reference time in advance based on the on-clock signal period and the number of gate clock signals, before actually generating the gate clock signal. This pre-calculated reference time is then used for comparison to detect abnormalities, allowing the system to prevent display defects before they occur rather than reacting after abnormalities manifest.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by comparing the gate clock reference time with the gate clock actual time (obtained by feeding back the generated gate clock signal) and using the comparison result to control whether to invert the on-clock and off-clock signals. This closed-loop feedback mechanism automatically corrects abnormal gate clock signals by adjusting the clock inversion logic based on detected timing deviations.

Inventive Principle:
Principle #23Feedback

2Manufacturing precision

If the activation period of gate clock signal is not monitored, then the ease of operation is improved, but the manufacturing precision deteriorates due to abnormal clock signals

Engineering Contradiction:
Improvegate clock signal timing precisionVSAvoidclock signal monitoring complexity
Core Design Contradiction:
Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent replaces complex mechanical or hardware-based clock signal monitoring mechanisms with a computational approach. The calculator computes the gate clock reference time based on software-defined parameters (on-clock signal period and number of gate clock signals), and the comparator performs digital timing comparison. This substitution of computational logic for physical monitoring mechanisms maintains timing precision while improving ease of operation.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent applies parameter changes by dynamically adjusting the inversion control of on-clock and off-clock signals based on the comparison result between reference time and actual time. When an abnormality is detected (timing deviation exceeds threshold), the system changes the operational parameters of the clock signal generation by inverting the clock signals, thereby correcting the timing precision without requiring manual intervention.

Inventive Principle:
Principle #35Parameter changes

3Object-affected harmful factors

If abnormal gate clock signals are not corrected, then the productivity is maintained, but the object-affected harmful factors increase due to display quality defects

Engineering Contradiction:
Improvedisplay quality defectsVSAvoidsignal correction processing time
Core Design Contradiction:
Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent applies the skipping principle by implementing a real-time automated correction mechanism that rapidly detects and corrects abnormal gate clock signals as they occur, rather than allowing defects to accumulate and requiring subsequent manual intervention. The comparator continuously monitors the gate clock actual time against the reference time and immediately triggers inversion control when abnormalities are detected, rushing through the correction process to prevent display quality defects before they affect productivity.

Inventive Principle:
Principle #21Skipping (Rushing through)

Solution Approach 2:

The patent implements self-service by designing an autonomous correction system where the calculator, comparator, and inversion control work together automatically without external intervention. The system self-detects timing abnormalities through feedback comparison and self-corrects by automatically inverting the on-clock and off-clock signals when needed, eliminating the need for manual debugging or production interruptions to address display quality defects.

Inventive Principle:
Principle #25Self-service

Data Source

PatentUS11715440B2Display device and method of driving the same
Publication Date: 2023.08.01 SAMSUNG DISPLAY CO LTD
  • US11715440B2 patent drawing
  • US11715440B2 patent drawing
  • US11715440B2 patent drawing

AI summary

A display device may include a display panel including a gate line, a data line, and a pixel electrically connected to the gate line and the data line, where display panel displays an image based on input image data, a gate driver which outputs a gate signal to the gate line, a data driver which outputs a data voltage to the data line, and a power supply voltage generator which provides a driving voltage to the display panel, the gate driver and the data driver. The power supply voltage generator generates a gate clock signal based on an on-clock signal and an off-clock signal and changes a count value of the on-clock signal or the off-clock signal when the gate clock signal is an abnormal signal.