Display Panel Reset Synchronization to Recover Black Screen Startup

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Solution Overview

Problem

Display devices can get stuck in a black screen state due to an error during the start-up initialization procedure, where a temporary lowering of the high level reference voltage reset signal prevents the timing controller from restarting the sensing operation, leading to an incomplete initialization and failure to display images.

Innovation Solution

A display panel driving unit with a control circuit that autonomously restarts the sensing operation by synchronizing the power on reset signal with the high level reference voltage reset signal, ensuring it shifts from a high logic level to a low logic level and back when the reset signal normalizes, allowing the sensing operation to resume.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the timing controller uses the high level reference voltage reset signal to determine sensing operation completion, then the sensing operation can be monitored, but when the reset signal temporarily drops and returns, the timing controller cannot restart the sensing operation, causing a black screen state

Engineering Contradiction:

Improvesensing operation completion detectionVSAvoidability to restart sensing operation after temporary fault

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent introduces a control circuit as an intermediary between the high level reference voltage reset signal and the power on reset signal. This control circuit monitors the reset signal and mediates the restart process by generating a restart control signal that triggers the power on reset signal to restart the sensing operation, thereby solving the problem of inability to restart after temporary faults

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The control circuit implements a feedback mechanism by continuously monitoring the high level reference voltage reset signal and automatically generating restart control signals when the reset signal returns to normal level. This feedback loop enables the system to detect and respond to temporary faults, automatically restarting the sensing operation without manual intervention

Inventive Principle:

Principle #23Feedback

2Reliability

If the timing controller determines sensing is not completed when reset signal drops, then faulty operations can be detected, but the display gets stuck in black screen state without ability to reset

Engineering Contradiction:

Improvefault detection capabilityVSAvoidautomatic reset capability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The control circuit provides self-service functionality by automatically detecting when the high level reference voltage reset signal returns to normal and autonomously generating the restart control signal to resume the sensing operation. This eliminates the need for external intervention or manual reset, allowing the system to recover from temporary faults independently

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The control circuit acts as an intermediary that bridges the fault detection mechanism and the reset functionality. It monitors the reset signal status and mediates the transition from fault state to normal operation by controlling the power on reset signal, thereby enabling automatic recovery without compromising fault detection

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the operation performing signal VOE stops at low logic level when reset signal drops, then the system halts incorrect operations, but the sensing operation cannot be restarted after reset signal normalizes

Engineering Contradiction:

Improveprevention of incorrect operationsVSAvoidsensing operation restart capability

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The control circuit implements periodic monitoring of the high level reference voltage reset signal and triggers periodic restart attempts when the signal returns to normal level. This periodic action ensures that the sensing operation is restarted at the appropriate moment, balancing the need to halt incorrect operations with the need to resume normal functionality

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The control circuit serves as an intermediary that coordinates between the operation performing signal VOE and the power on reset signal. It monitors when VOE is halted due to reset signal drops and mediates the restart process by generating control signals that resume VOE and restart the sensing operation, thereby maintaining both operational safety and productivity

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10347186B2Display panel driving unit, driving method thereof, and display device including the same

Publication Date: 2019.07.09 LG DISPLAY CO LTD

AI summary

A display panel driving unit can include: a timing controller to supply a power on reset signal for starting a sensing operation for pixel compensation during a sensing period before displaying an image; a power management integrated circuit (PMIC) to supply a high level reference voltage reset signal to the timing controller, and generate a control signal; and a control circuit to receive the high level reference voltage reset signal and the PMIC, in response to the high level reference voltage reset signal transitioning from a high to low logic level and then from the low logic level back to the high logic level, shift the power on reset signal to transition from a high to low logic level and then from the low logic level back to high, to follow the high level reference voltage reset signal, and supply the power on reset signal to the timing controller.