Image display device
First Claim
1. An image display device that has an authentication/decryption unit for authenticating and decrypting encrypted video signals and a display for displaying video signals thereon, said image display device comprising:
- open-condition detecting means for detecting whether a cabinet of said image display device is opened;
storing means for storing one of a first flag indicating that an authentication operation of said authentication/decryption unit is enabled and a second flag indicating that the authentication operation of said authentication/decryption unit is disabled;
flag writing means for writing said second flag into said storing means when said open-condition detecting means detects that said cabinet is opened;
enabling/disabling control means for controlling enabling/disabling of the authentication operation of said authentication/decryption unit according to the flag stored in said storing means;
first display control means for putting said display in a first state by displaying the video signals decrypted from the encrypted video signals when the flag stored in said storing means is the first flag; and
second display control means for putting said display in a second state, which is different from the first state, when the flag stored in said storing means is the second flag.
2 Assignments
0 Petitions
Accused Products
Abstract
An authentication/decryption unit authenticates and decrypts video signals received from a video signal output device. An open-condition detector detects the open condition of a cabinet. A memory stores therein one of a first flag indicating that an authentication operation of the authentication/decryption unit is enabled and a second flag indicating that an authentication operation of the authentication/decryption unit is disabled. A micro-controller controls whether the authentication operation of the authentication/decryption unit will be enabled or disabled according to the flag in the memory. When the open-condition detector detects that the cabinet is opened, the micro-controller writes the second flag into the memory.
8 Citations
8 Claims
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1. An image display device that has an authentication/decryption unit for authenticating and decrypting encrypted video signals and a display for displaying video signals thereon, said image display device comprising:
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open-condition detecting means for detecting whether a cabinet of said image display device is opened; storing means for storing one of a first flag indicating that an authentication operation of said authentication/decryption unit is enabled and a second flag indicating that the authentication operation of said authentication/decryption unit is disabled; flag writing means for writing said second flag into said storing means when said open-condition detecting means detects that said cabinet is opened; enabling/disabling control means for controlling enabling/disabling of the authentication operation of said authentication/decryption unit according to the flag stored in said storing means; first display control means for putting said display in a first state by displaying the video signals decrypted from the encrypted video signals when the flag stored in said storing means is the first flag; and second display control means for putting said display in a second state, which is different from the first state, when the flag stored in said storing means is the second flag. - View Dependent Claims (2, 3, 4)
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5. An image display device that has an authentication/decryption unit for authenticating and decrypting encrypted video signals and a display for displaying video signals thereon, said image display device comprising:
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detecting means for detecting that there is a possibility that video signals, decrypted from the encrypted video signals by said authentication/decryption unit, will be taken out of said image display device; storing means for storing one of a first flag indicating that an authentication operation of said authentication/decryption unit is enabled and a second flag indicating that the authentication operation of said authentication/decryption unit is disabled; flag writing means for writing said second flag into said storing means when said detecting means detects that there is a possibility that the video signals decrypted from the encrypted video signals will be taken out of said image display device; enabling/disabling control means for controlling enabling/disabling of the authentication operation of said authentication/decryption unit according to the flag stored in said storing means; first display control means for putting said display in a first state by displaying the video signals decrypted from the encrypted video signals when the flag stored in said storing means is the first flag; and second display control means for putting said display in a second state, which is different from the first state, when the flag stored in said storing means is the second flag. - View Dependent Claims (6, 7, 8)
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Specification