LCD Edge Frame Reduction via Dual-Side Drive Circuit Segmentation
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Solution Overview
Problem
The challenge is to reduce the width of the edge frame in liquid crystal display devices with touch detection functionality while maintaining sufficient driving ability for the drive circuit to supply the required voltage to the drive electrodes within a predetermined time.
Innovation Solution
The solution involves a liquid crystal display device configuration with a plurality of drive electrodes and signal lines, where drive circuits are arranged along the sides of the liquid crystal element array, and voltage wires are used to supply periodic voltage changes to selected and non-selected drive electrodes, ensuring efficient touch detection without compromising the driving ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the edge frame width is reduced to meet market demands, then the aesthetic appearance and screen-to-body ratio are improved, but the driving ability of the drive circuit becomes insufficient to supply the required voltage to the drive electrodes within a predetermined time
Solution Approach 1:
The drive circuit is divided into multiple independent drive circuits, each responsible for driving a specific drive electrode. This segmentation allows each drive circuit to be optimized for high-speed voltage supply capability while reducing the overall area requirement compared to a single large drive circuit, thus enabling edge frame reduction without compromising driving ability.
Solution Approach 2:
The invention transitions from a conventional single-side drive circuit arrangement to a dual-side arrangement where drive circuits are positioned on both left and right sides of the liquid crystal element array. This dimensional change distributes the driving load and reduces the area constraint on each individual drive circuit, enabling sufficient voltage supply capability within a compact edge frame structure.
2Length of stationary object
If the drive circuit area is reduced due to narrower edge frame, then the edge frame width is reduced, but the time required to supply voltage to drive electrodes increases beyond the predetermined time
Solution Approach 1:
By segmenting the drive circuit into multiple independent units positioned on both sides of the display, each drive circuit can supply voltage to its assigned drive electrode simultaneously. This parallel operation reduces the total voltage supply time while allowing each individual drive circuit to remain compact, thus achieving both narrow edge frame and fast voltage supply.
Solution Approach 2:
The drive circuits are designed to continuously and simultaneously supply voltage to their respective drive electrodes without interruption or sequential delay. This continuous parallel operation ensures that the voltage supply time remains within the predetermined limit even with reduced drive circuit area in the narrow edge frame configuration.
3Reliability
If multiple drive circuits are arranged on both sides of the liquid crystal element array, then the voltage supply capability is improved, but the device complexity increases
Solution Approach 1:
While drive circuits are positioned on both sides of the liquid crystal element array, the invention uses asymmetric arrangement where the left and right drive circuits may have different configurations optimized for their respective positions. This asymmetric design maintains voltage supply capability while managing complexity by allowing flexible, position-specific optimization rather than requiring symmetric duplication of all components.
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 configuration allows for a reduction in the edge frame width while maintaining the necessary driving ability, enabling effective touch detection and image display in liquid crystal display devices.
Implementation Method 1
proximity of an external object is detected by utilizing the change in the capacitance value at an intersecting portion where a drive electrode and a detection electrode intersect
Data Source
AI summary
A liquid crystal display device is provided and includes a liquid crystal element array having pixel electrodes and switching elements arranged in a matrix form; scanning lines arranged in each row of the liquid crystal element array and supply a scanning signal to switching elements; signal lines arranged in each column of the liquid crystal element array and supply an image signal to the pixel electrodes through switching elements; touch electrodes overlapping pixel electrodes and arranged in the column of the liquid crystal element array; signal line drive circuit arranged along one side of the liquid crystal element array parallel to the row of the liquid crystal element array and forms the image signal; first circuit arranged along the other side of the liquid crystal element array parallel to the row of the liquid crystal element array and is connected to the touch electrodes; and second circuit arranged along the one side of the liquid crystal element array and is connected to the touch electrodes, wherein a touch signal is supplied from the second circuit on the one side of the liquid crystal element array and the touch signal is supplied from the first circuit on the other side of the liquid crystal element array.