Integrated Light Sensing Panel for Display Thickness Reduction
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Solution Overview
Problem
Conventional liquid crystal display devices with integrated light sensing panels face issues such as deteriorated optical characteristics and increased thickness due to the addition of a touch panel, which affects brightness and viewing angle.
Innovation Solution
A light sensing panel design featuring sensors arranged in rows and columns, with specific bias voltage lines and scan lines, including a third bias line to connect shorted sub-lines, allowing for efficient light sensing and signal transfer without the need for a separate touch panel, incorporating infrared and visible wavelength sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a touch panel is separately provided on the liquid crystal display device, then light sensing capability is improved, but optical characteristics (brightness and viewing angle) are deteriorated and total thickness increases
Solution Approach 1:
The patent combines the light sensing panel with the liquid crystal display panel into a single integrated structure. The light sensing panel is positioned at the same location as the display panel, with sensors arranged in rows and columns that serve both display and sensing functions simultaneously, eliminating the need for a separate touch panel layer
2Difficulty of detecting and measuring
If a touch panel is separately provided on the liquid crystal display device, then light sensing capability is improved, but total thickness increases by the thickness of the touch panel
Solution Approach 1:
The light sensing panel and liquid crystal display panel are merged into a single integrated panel structure, where the sensors are embedded within the display panel's substrate or active matrix, eliminating the need for additional thickness from a separate touch panel layer
3Measurement precision
If sensors are arranged in rows and columns with multiple bias lines and sub-lines, then light sensing precision is improved, but device complexity increases
Solution Approach 1:
The bias lines are segmented into main lines and sub-lines, where main lines extend across the panel and sub-lines branch off to connect to individual sensor columns. This segmentation allows systematic voltage distribution to multiple sensors while maintaining manageable line routing and reducing overall complexity
Solution Approach 2:
Different regions of the panel use different bias line configurations - main lines for broad voltage distribution and sub-lines for localized sensor connections. This local differentiation optimizes the balance between sensing precision and structural complexity by providing detailed control only where needed
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 optical performance and reduces the thickness of the display device while maintaining effective light sensing capabilities, improving user interaction without compromising display quality.
Implementation Method 1
a plurality of sensors arranged in a plurality of rows and a plurality of columns, where the plurality of sensors receives a first bias voltage and a second bias voltage and outputs light sensing signals based on light incident thereto
Data Source
AI summary
A light sensing panel includes sensors arranged in rows and columns, where the sensors receive a first bias voltage and a second bias voltage and output light sensing signals based on light incident thereto; first and second bias lines which transfers the first and second bias voltages, respectively, to the sensors, where each of the first and second bias lines includes a main line and sub lines diverged from the main line and arranged in a second direction corresponding to the columns;, where the sub lines of the first and second bias lines are alternately arranged, and where when two adjacent sub lines are shorted, the shorted sub line of the first bias line is separated from the main line of the first bias line.