Driving Module Two-Wire Binding-Point Voltage Generation
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Solution Overview
Problem
The high cost of Flexible Flat Cables (FFC) in liquid crystal display panels due to the need for multiple metal wires to transmit binding-point voltages between control boards, which increases the overall production cost of display devices.
Innovation Solution
A driving module that uses a connecting cable with only two metal wires to generate and output positive and negative binding-point voltages, utilizing operational amplifiers to ensure sufficient driving capability for data driving chips, thereby reducing the need for additional pins and cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple metal wires are used in FFC to transmit binding-point voltages between control boards, then the driving capability and voltage transmission capability are improved, but the cost of the connecting cable and overall display device increases
Solution Approach 1:
The patent divides the voltage transmission function into two parts: (1) transmits only two reference voltages (first and second voltages) through the connecting cable to the second control board, and (2) generates the required multiple binding-point voltages locally on the second control board through voltage division. This segmentation reduces the number of wires needed in the connecting cable from multiple wires to just two wires, thereby reducing cable cost while maintaining the ability to provide all necessary voltages.
Solution Approach 2:
The patent performs voltage division in advance on the second control board to generate multiple binding-point voltages from the two transmitted reference voltages. By preparing the voltage division circuitry and resistor networks beforehand on the receiving end, the system can derive all necessary voltages locally without needing to transmit each voltage separately through dedicated wires, thus reducing cable complexity and cost.
2Ease of manufacture
If a two-wire cable is used to transmit binding-point voltages, then the cost of the connecting cable is reduced, but the driving capability may be insufficient
Solution Approach 1:
The patent changes the voltage parameters by transmitting only two reference voltages with sufficient voltage levels and current capability through the two-wire cable. These reference voltages are then used to generate all other binding-point voltages through voltage division. The key is that the two transmitted voltages have adequate power parameters to serve as sources for generating all other required voltages, thus maintaining driving capability despite using fewer wires.
Solution Approach 2:
The patent introduces voltage division circuits with resistors as intermediary elements on the second control board. These intermediary circuits convert the two transmitted reference voltages into multiple binding-point voltages with appropriate levels. The voltage division circuits act as mediators that transform the limited two-wire input into the multiple voltage outputs needed by various components, preserving full functionality while reducing cable requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces the cost of the connecting cable and overall display device by using a simpler two-wire cable to transmit binding-point voltages, while ensuring adequate driving capability for the display panel.
Implementation Method 1
each data driving circuit comprises an op-amp to amplify the gamma voltages, wherein the amplified gamma voltages are supplied to all data drivers
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A driving module (1) and a display device (100). The driving module (1) uses a binding point voltage generation circuit (11) to output first voltages, second voltages and a plurality of first voltage division binding point voltages. The two second voltages are divided by a first voltage division module (31) to generate a plurality of second voltage division binding point voltages. Each first data driving circuit (12) outputs first amplification binding point voltages. Each second data driving circuit (32) outputs second amplification binding point voltages. The first voltages, the second voltages, third voltages, fourth voltages, each first amplification binding point voltage, and each second amplification binding point voltage are inputted to each first data driving circuit (12) and each second data driving circuit (32).