Display Apparatus Reverting Past State via Order-Based Object Data
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Solution Overview
Problem
Existing remote conference systems cannot revert the display state to a past time point, lacking a mechanism to reproduce the display state of drawing objects.
Innovation Solution
A display apparatus and system that includes a display unit, an obtaining unit for coordinates, an object display unit, a generating unit for object data with order information, and a script transmitting unit to allow users to revert the display state by transmitting object data and voice data based on user-specified order information, reducing communication quantity by only transmitting data corresponding to the specified order.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all object data is transmitted to the client, then the display state can be reproduced accurately, but the communication quantity increases
Solution Approach 1:
The patent extracts only the necessary portion of object data (from the specified order up to the latest order) and transmits it to the client, rather than transmitting all object data. This extraction principle reduces communication quantity while maintaining the ability to reproduce the display state accurately by sending only the relevant data subset.
Solution Approach 2:
The patent segments the object data transmission based on order information, dividing the data into chronological segments. When a user specifies a particular order, only the segment from that order to the latest order is transmitted, allowing selective reproduction of display states without communicating the entire data set.
2Adaptability or versatility
If the system transmits object data with order information, then the display can be reverted to past states, but the system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-adding order information to each object data element before transmission. This allows the client to later revert to past display states by simply requesting data from a specific order point, without requiring complex rollback mechanisms or stored historical states.
Solution Approach 2:
The system uses feedback through the order information mechanism, where the client can request specific past states by referencing order numbers, and the server responds by transmitting the appropriate data segment, enabling controlled reversion to past display states.
Data Source
AI summary
A client can return a display state of an object to the past. When a point body moves on a screen, a projector draws an object of a line representing a moving trajectory. The projector generates object data representing the object and transmits the generated object data to tablet terminals. The object data contains order information representing generation order of the object. The tablet terminals display the object represented by the transmitted object data on a touch panel. When performing an operation for returning the display, the tablet terminals return the display by object unit based on the order information contained in the object data.