LED Video Wall Pointer Sensing Through Subframe Signal Control
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Solution Overview
Problem
Existing light emitting diode (LED) panel-based image display apparatuses require a separate optical sensor to sense pointer light, complicating panel implementation.
Innovation Solution
An image display apparatus with a driving controller that outputs scan and data signals during different subframe periods to stabilize pointer light sensing without a separate optical sensor, utilizing forward and backward currents, and varying voltage levels to sense and display pointer light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate optical sensor is added to sense pointer light in LED panel-based display apparatus, then pointer light sensing capability is improved, but panel implementation complexity increases
Solution Approach 1:
The light emitting diodes are made to serve dual functions: displaying images during display mode and sensing pointer light during sensing mode. The driving controller switches between these modes by controlling the LEDs to emit light for display or remain off for sensing, eliminating the need for separate optical sensors while maintaining both display and sensing capabilities
Solution Approach 2:
The display function and pointer light sensing function are merged into a single system using the same light emitting diodes. By timing the sensing operation to occur when LEDs are not emitting display light, the patent combines both functions without requiring additional hardware components, thus reducing panel implementation complexity
2Device complexity
If light emitting diodes are used for both display and pointer light sensing, then device complexity is reduced, but sensing stability during display operation may deteriorate
Solution Approach 1:
The patent implements periodic switching between display mode and sensing mode. During display mode, LEDs emit light to show images. During sensing mode, LEDs are turned off to sense pointer light. This periodic alternation allows the same LEDs to perform both functions stably without interference, maintaining sensing stability while reducing device complexity
Solution Approach 2:
The operation is segmented into distinct time periods: display mode periods where LEDs emit light for image display, and sensing mode periods where LEDs are off for pointer light detection. This temporal segmentation allows each function to operate optimally during its designated period, ensuring sensing stability while using the same hardware for both purposes
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
Stable sensing and display of pointer light without a separate optical sensor, reducing complexity and power consumption while maintaining efficient operation.
Implementation Method 1
a light emitting diode; a driving controller configured to control a forward current to flow on the light emitting diode in the first mode, and control a backward current to flow on the light emitting diode on which the pointer light is incident in the second mode
Data Source
AI summary
The present disclosure relates to an image display apparatus and a video wall including the same. The image display apparatus according to an embodiment of the present disclosure includes: a panel including a plurality of light emitting diodes; and a driving controller configured to output a scan signal to the plurality of light emitting diodes for each of a plurality of subframe periods, in which the driving controller outputs a scan signal and a data signal to the light emitting diode during the plurality of subframe periods in a first mode corresponding to a display mode, and outputs only any one of the scan signal and the data signal during some subframe periods among the plurality of subframe periods in a second mode for sensing a pointer light. Accordingly, the pointer light can be stably sensed without a separate optical sensor.