Touch Display Common Voltage Feedback Circuit
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Solution Overview
Problem
The increasing size and resolution of touch display devices lead to a load increase on touch electrodes, causing distortion in the common voltage supplied, which can result in image errors due to the embedding of touch electrodes within the display panel, making it difficult to maintain image quality and increasing manufacturing costs.
Innovation Solution
A touch display device with a common voltage feedback structure that includes a common voltage feedback line connected to the touch lines or overlapping with the gate lines in a non-display area, allowing for the detection and compensation of distortion in the common voltage through a common voltage compensation circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If touch electrodes are embedded in the display panel to reduce device thickness, then the device becomes thinner and integration is improved, but the load on touch electrodes increases causing common voltage distortion and image errors
Solution Approach 1:
The patent introduces a feedback mechanism where the distorted common voltage signal is detected through feedback lines, processed by a compensation circuit to generate a corrected common voltage signal, and then reapplied to the touch electrodes. This closed-loop feedback system actively compensates for the voltage distortion caused by electrode loading effects, thereby maintaining image quality while preserving the thin-profile design with embedded electrodes.
Solution Approach 2:
The patent changes the electrical parameters of the common voltage signal by introducing a compensation signal that adjusts the voltage characteristics. The compensation circuit modifies the common voltage parameter (Vcom) to counteract the distortion caused by the touch electrode load, thereby correcting the image display while maintaining the embedded electrode structure.
2Area of stationary object
If the size and resolution of the touch display device are increased, then the display capability is improved, but the load on touch electrodes increases causing greater common voltage distortion
Solution Approach 1:
The feedback mechanism continuously monitors the common voltage distortion regardless of display size or resolution. The compensation circuit processes the detected distortion and generates a corrected common voltage signal that maintains stability even as the display area increases, thereby preserving voltage reliability in large-high resolution displays.
Solution Approach 2:
The compensation circuit proactively counteracts the voltage distortion before it affects image quality. By detecting the distortion through feedback lines and applying a pre-corrected common voltage signal, the system prevents the harmful effects of voltage instability, especially important in large displays where loading effects are more pronounced.
3Adaptability or versatility
If a separate touch panel is stacked on the flat panel display device, then touch functionality is achieved, but the device becomes thicker and light transmission efficiency decreases
Solution Approach 1:
The patent merges the touch electrode structure with the display panel by embedding the touch electrodes within the display panel's electrode layers. This integration combines the display and touch sensing functions into a single unified structure, eliminating the need for a separate stacked touch panel, thereby reducing device thickness while maintaining full touch functionality.
4Volume of moving object
If touch electrodes are embedded in the display panel, then device thickness is reduced, but manufacturing cost increases due to complex processes
Solution Approach 1:
The patent segments the common voltage signal path into distinct components: the original common voltage line, the feedback line for detecting distortion, and the compensation circuit path. This segmentation allows for targeted modifications and optimizations in the manufacturing process, making the complex embedded electrode structure more manageable and cost-effective to produce.
Data Source
AI summary
A touch display device of the present disclosure may include a display panel on which a plurality of touch electrodes are electrically connected to a plurality of touch lines; a gate driving circuit for supplying scan signals to the display panel through a plurality of gate lines; a touch driving circuit for sensing a touch by detecting a touch signal from the plurality of touch electrodes and supplying a common voltage to the touch electrodes through the touch lines; a common voltage feedback line electrically connected to the plurality of touch lines or disposed to overlap with the plurality of gate lines in a non-display area of the display panel; and a common voltage compensation circuit for supplying a compensated common voltage based on a distortion in the common voltage.