Touch Display Panel with Segmented Viewing Angle Control Electrodes
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Solution Overview
Problem
Conventional liquid crystal display panels with wide viewing angles fail to provide a peep-proof function due to insufficient viewing angle control electrodes, leading to inconsistent voltage application and reduced peep-proof functionality.
Innovation Solution
A touch display panel design incorporating a plurality of viewing angle control electrode units, alternately arranged along a direction, and touch receiving electrode units, which form touch units, allowing for synchronized touch signal and viewing angle control voltage application to achieve both wide viewing angles and peep-proof capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wide viewing angle liquid crystal display panel is used, then the viewing angle is improved, but the peep-proof function deteriorates
Solution Approach 1:
The viewing angle control electrode is divided into multiple segments (first viewing angle control electrode and second viewing angle control electrode) that can be independently controlled. This segmentation allows different voltage to be applied to different regions, enabling precise control of liquid crystal alignment in various viewing zones to achieve both wide viewing angle and peep-proof function
Solution Approach 2:
Different regions of the display panel are provided with different electrode configurations and voltage controls. The first and second viewing angle control electrodes apply different voltages to create distinct liquid crystal alignment patterns in different areas, allowing the center region to maintain narrow viewing angle for security while peripheral regions provide wide viewing angle for visibility
2Device complexity
If only one or two viewing angle control electrodes are configured, then the device complexity is reduced, but the peep-proof function deteriorates due to inconsistent voltage application
Solution Approach 1:
Instead of using a single viewing angle control electrode, the patent divides it into multiple segmented electrodes (first viewing angle control electrode and second viewing angle control electrode) that can be independently controlled. This segmentation enables precise voltage application to different regions, ensuring consistent peep-proof function across all pixel lines while maintaining manageable device complexity
Solution Approach 2:
The multiple viewing angle control electrodes serve dual functions: they control the viewing angle of the display and simultaneously provide touch sensing capability. This multi-functionality reduces the need for separate touch sensor electrodes, thereby limiting device complexity while improving peep-proof function
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 design enhances the peep-proof function by ensuring consistent voltage application across pixel lines, improving the display's ability to maintain image integrity within a limited viewing angle range while supporting touch sensing capabilities.
Implementation Method 1
a voltage with a same polarity as that of a pixel voltage is provided in a narrow viewing angle mode, so that liquid crystal molecules adjacent to the upper substrate may present vertical alignment
Data Source
AI summary
A touch display panel and a driving method thereof are disclosed. The touch display panel includes a plurality of pixels, a plurality of viewing angle control (VAC) electrode units, and a plurality of touch receiving electrode units. Each pixel includes a pixel electrode and a common electrode. At least one of the pixel electrode and the common electrode has a plurality of slits. The VAC electrode units are arranged along a first direction. Each VAC electrode unit includes a plurality of first VAC electrode series and a plurality of second VAC electrode series, and each first VAC electrode series and each second VAC electrode series are alternately arranged along the first direction. The touch receiving electrode units are arranged along the second direction, and the VAC electrode units and the touch receiving electrode unit form a touch unit.