发明名称 |
Portable electronic display device with automatic lockout of message selection switches to prevent tampering with selected message |
摘要 |
A portable electronic display device includes an electronic display surface having at least one display panel that displays a graphical and/or textual message, memory that stores a plurality of the messages, and one or more switches on the device that allow user selection of one of the messages. The device further includes a controller that disables the one or more switches if none of the switches are selected after a predetermined period of time after power is turned on to the display device, or if none of the switches are selected after a predetermined period of time subsequent to the last switch selection occurrence. In this manner, a person is prevented from subsequently changing the message via the one or more switches.
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申请公布号 |
US7737912(B2) |
申请公布日期 |
2010.06.15 |
申请号 |
US20050054710 |
申请日期 |
2005.02.09 |
申请人 |
INTUITIVE CONTROL SYSTEMS, LLC |
发明人 |
GRAEF JOHN T.;KLINE ERIC;HALL PHILIP R. |
分类号 |
G09G5/00;G09F9/30;G09F9/33;G09F13/00 |
主分类号 |
G09G5/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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