Common Voltage Current Adjustment for Display Panel Reliability
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Solution Overview
Problem
In liquid crystal display devices, when a transmission error occurs in one common transmission line, the current supplied through another line can exceed its allowable limit, leading to reliability issues and abnormalities in the display panel.
Innovation Solution
A display device with multiple common transmission lines and detection units that adjust the current output of the common voltage generating circuit based on detected errors, ensuring that the current amount is reduced in affected lines to prevent overload, using an operational amplifier and current adjusting units with push-pull circuits and resistors to distribute the current effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple common transmission lines are used to supply common voltage, then the reliability of the display panel is improved, but when a transmission error occurs in one line, the current amount in another line increases and may exceed the allowable current amount
Solution Approach 1:
The patent employs detection units that continuously monitor the transmission status of each common transmission line and provide feedback signals to a current adjusting unit. When a transmission error is detected in any line, the detection unit generates an error signal that triggers the current adjusting unit to reduce the output current of the common voltage generating circuit, thereby preventing current overload on remaining healthy transmission lines.
Solution Approach 2:
The patent implements dynamic current adjustment by making the output current of the common voltage generating circuit variable based on the operational status of transmission lines. The current adjusting unit dynamically modifies the current amount in response to detection unit feedback, allowing the system to adapt its current distribution according to real-time transmission conditions rather than maintaining a fixed current level.
2Power
If the current amount is increased to compensate for transmission errors, then the voltage supply performance is improved, but the current may exceed the allowable current amount of connection portions
Solution Approach 1:
The patent applies preliminary anti-action by proactively reducing the current output before current overload can occur. When a transmission error is detected, the system preemptively lowers the current amount to a safe level that the remaining healthy transmission lines can handle, rather than attempting to increase current to compensate for the loss, thus preventing damage to connection portions before it happens.
Solution Approach 2:
The patent changes the current parameter of the common voltage generating circuit based on transmission status. The current adjusting unit modifies the output current parameter in response to detection unit feedback, transitioning from a high current state (when all lines are healthy) to a reduced current state (when transmission errors occur), thereby maintaining power supply adequacy while preventing connection portion overload.
Data Source
AI summary
Provided is a display device, including: a display panel including a pixel electrode and a common electrode; a common voltage generating circuit configured to generate a common voltage to be supplied to the common electrode; a plurality of common transmission lines configured to transmit, to the common electrode, the common voltage generated by the common voltage generating circuit; a plurality of detection units, which are connected to the plurality of common transmission lines, respectively, and are configured to detect a transmission error of the common voltage in the plurality of common transmission lines, respectively; and a current adjusting unit configured to adjust a current amount of an output current of the common voltage generating circuit based on detection results of the plurality of detection units.