LCD LOG Signal Line Resistance Compensation
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Solution Overview
Problem
The existing liquid crystal display (LCD) devices using the LOG-type signal line system suffer from signal attenuation due to increasing line resistance, leading to non-uniform common voltage distribution across the panel, which results in brightness inconsistencies and a cross-line effect, thereby deteriorating picture quality.
Innovation Solution
Incorporating an inspection line to detect and compensate for the resistance-induced voltage differences along the LOG-type signal lines, ensuring uniform common voltage distribution by calculating and applying a phase-inverted average common voltage to each gate drive IC, thereby maintaining consistent brightness across horizontal line blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If LOG-type signal lines are used to eliminate gate PCB and reduce display thickness, then device thickness is reduced, but signal attenuation occurs due to increasing line resistance
Solution Approach 1:
The patent introduces a feedback mechanism where the resistance value of the LOG-type signal line is detected, and a compensation voltage is generated based on this detected value. The compensation voltage is then fed back to compensate for the voltage drop caused by line resistance, thereby maintaining signal quality while using the thin LOG-type connection method.
Solution Approach 2:
The patent dynamically adjusts the compensation voltage parameter based on the detected resistance value of the signal line. By changing the voltage parameter in response to resistance variations, the system compensates for signal attenuation and maintains reliable signal transmission despite the long signal lines required for thin display construction.
2Device complexity
If LOG-type signal lines are used to connect gate drive ICs, then device complexity is reduced, but brightness uniformity deteriorates due to non-uniform common voltage distribution
Solution Approach 1:
The timing controller detects the resistance value of the LOG-type signal line and generates a compensation voltage based on this feedback. This compensation voltage is applied to counteract the non-uniform common voltage distribution caused by line resistance, thereby ensuring uniform brightness across the display while maintaining the simplified LOG-type connection structure.
Solution Approach 2:
The patent introduces a compensation voltage as an intermediary element that mediates between the non-uniform common voltage caused by line resistance and the required uniform brightness output. This compensation voltage acts as a corrective intermediary that balances the voltage distribution across different gate drive ICs.
3Ease of manufacture
If long LOG-type signal lines are used to supply signals to gate drive ICs, then ease of manufacture is improved, but picture quality worsens due to cross-line effects
Solution Approach 1:
The system detects the resistance value of the long LOG-type signal lines and generates compensation voltages based on this feedback. This allows the use of long, easy-to-manufacture signal lines while compensating for the signal attenuation and cross-line effects that would otherwise degrade picture quality.
Solution Approach 2:
The patent converts the harmful effect of line resistance (which increases with longer signal lines) into a beneficial compensation mechanism. By detecting the resistance value and generating appropriate compensation voltages, the system transforms the potential harm of long signal lines into an opportunity for precise voltage control, thereby maintaining high picture quality while enjoying the manufacturing simplicity of long LOG-type lines.
Data Source
AI summary
A liquid crystal display device includes an integrated circuit, a signal line, an inspection line and a signal generator. The integrated circuit drives a liquid crystal display panel. The signal line applies a driving signal to the integrated circuit. The inspection line detects the driving signal inputted to the integrated circuit. The signal generator supplies a compensation signal corresponding to the detected driving signal from the inspection line.