Display Power Supply Control for Voltage Discrepancy Prevention
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Solution Overview
Problem
Liquid crystal display devices where source lines are driven from both ends face issues with voltage discrepancies leading to potential faults, such as connection failures and communication errors, which can result in serious damage like smoking or ignition, and existing methods only detect abnormalities after they occur, not preventing them.
Innovation Solution
A display device configuration with source lines driven from both ends, featuring a power supply circuit that switches output based on signals from source boards to control boards, including connection confirmation signals and drive finish signals, to prevent power supply voltage from being applied in case of abnormalities, thereby preventing serious damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If source lines are driven from both ends to improve drive capability for large-sized panels, then the drive capability is improved, but the risk of serious damage from voltage discrepancies and connection failures increases
Solution Approach 1:
The patent applies preliminary action by detecting connection status and drive completion status before voltage discrepancies can cause damage. The control board detects whether source drivers are properly connected and whether driving is completed before the next voltage application, preventing voltage discrepancies from occurring in the first place rather than merely detecting them after damage occurs
Solution Approach 2:
The patent implements feedback mechanisms where source boards send connection confirmation signals to the control board, and the control board monitors drive finish signals from source drivers. This feedback loop allows the system to adjust power supply timing based on actual connection status and drive completion status, preventing voltage discrepancies caused by improper connections or incomplete driving
2Reliability
If existing abnormality detection methods are used to detect connection failures, then abnormality detection is achieved, but the detection occurs only after damage has already occurred
Solution Approach 1:
The patent performs preliminary detection of connection status and drive completion status before voltage discrepancies can cause damage. By checking connection confirmation signals and drive finish signals in advance, the system identifies abnormalities before they lead to smoking or ignition, eliminating the time loss between detection and damage prevention
Solution Approach 2:
The patent introduces intermediary detection mechanisms through the control board that monitors connection confirmation signals from source boards and drive finish signals from source drivers. This intermediary layer detects abnormalities early by monitoring intermediate states (connection status, drive completion) before final damage occurs, enabling timely intervention
Data Source
AI summary
In a display device in which source lines on a display panel are driven from both ends, when a connection confirmation signal (S2) output from a source board (13) indicates abnormality, a power supply circuit (18) on a control board (12) stops outputting a power supply voltage (Va) used when source drivers drive the source lines. The control board (12) outputs a high-level connection confirmation signal (S1) to the source board (13), the source board (13) outputs the connection confirmation signal (S1) to the control board (12) as the connection confirmation signal (S2), and the control board (12) pulls down the connection confirmation signal (S2) to a low level. With this, it is possible to prevent serious damage from occurring even when a connection failure or the like occurs.