Segmented Polarizing Panel for 3D Display Crosstalk Reduction
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Solution Overview
Problem
Passive polarized type 3D display apparatuses experience undesired crosstalk due to the sequential scanning of LCD panels and limitations in resistive characteristics of transparent electrodes, making it difficult to employ in large-sized display devices.
Innovation Solution
A polarizing panel is designed with segment electrodes and a light-blocking member that blocks oblique light and reduces RC delay by applying driving voltages sequentially, allowing for synchronized activation with the LCD panel's gate lines, and includes a conductive light-blocking material to improve electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a sequentially scanned LCD panel is used to form the underlying image for the polarizing panel, then the display can be updated frame by frame, but crosstalk occurs because part of the previous frame remains visible during the transition to the new frame
Solution Approach 1:
The polarizing panel is divided into multiple scanline segments that are activated sequentially to match the frame-by-frame update of the LCD panel. This segmentation allows each portion of the display to be controlled independently, preventing crosstalk between frames by ensuring that only the currently being updated scanlines are active during transition.
Solution Approach 2:
The polarizing panel's scanline segments are activated in advance of the LCD panel's frame completion, creating a synchronized transition. By preliminarily preparing the polarizing states to match the upcoming frame data, the system prevents residual image visibility and eliminates crosstalk before it can occur.
2Device complexity
If transparent electrodes with normal resistive characteristics are used in the time multiplexing polarizing panel, then the structure remains simple, but it becomes difficult to employ the display apparatus in large-sized display devices
Solution Approach 1:
The light-blocking member is designed with different properties in different regions: it has light-blocking capability to prevent crosstalk and also incorporates conductive material in specific areas to reduce RC delay. This local differentiation of properties allows the structure to simultaneously achieve crosstalk prevention and improved electrical performance for large-scale applications.
Solution Approach 2:
The light-blocking member is formed as a composite structure combining light-blocking material with conductive material. This composite approach allows the single component to fulfill multiple functions: blocking oblique light to prevent crosstalk while providing electrical conductivity to reduce RC delay, thereby enabling scalability to large display sizes without significantly increasing complexity.
3Device complexity
If the polarizing panel is flashed into one polarizing state all at once, then the switching is simple, but crosstalk occurs because the LCD panel is still displaying older frame data
Solution Approach 1:
The polarizing panel is divided into multiple scanline segments that can be switched independently. Instead of flashing the entire panel at once, each scanline segment is switched sequentially as its corresponding frame data becomes available. This segmentation maintains relatively simple switching mechanics while eliminating crosstalk by ensuring polarizing state changes are synchronized with frame updates.
Solution Approach 2:
The polarizing panel employs periodic switching of scanline segments in synchronization with the frame-by-frame update cycle of the LCD panel. Each scanline segment is activated in a repeating sequence that matches the periodic frame refresh, ensuring that polarizing state changes occur at the appropriate moments to prevent crosstalk while maintaining a relatively simple periodic control mechanism.
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
The solution effectively prevents crosstalk and reduces the RC delay factor, enabling the use of the display apparatus in large-sized display devices by ensuring accurate transmission of polarized light for 3D imagery.
Implementation Method 1
The liquid crystal layer transmits a first polarized light or a second polarized light in accordance with an electric field between the segment electrodes and the common electrode
Implementation Method 2
the polarizing panel has its own black matrix for blocking leakage of oblique light from a not-yet-repainted group of pixel rows
Data Source
AI summary
A polarizing panel includes a first substrate, a second substrate and an interposed first liquid crystal layer. The first substrate includes a plurality of spaced apart and segment electrodes and segments of a first light-blocking member disposed within interval areas between the segment electrodes. The second substrate faces the first substrate to include a common electrode facing the segment electrodes. The first liquid crystal layer is able to selectively apply a first polarizing effect to light rays passing therethrough when in a corresponding first state and to apply a different second polarizing effect to passing through light rays when in a corresponding second state, where the first and second states can be selectively chosen by voltages applied to the segment electrodes. The light-blocking member can reduce image crosstalk lights from being emitted from the interval areas between the segment electrodes, so that a crosstalk component of a formed 3D image may be prevented or reduced due to light-blocking effects.