# US 2010/0166080 A1 · Video display apparatus

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- Number: US 2010/0166080 A1
- Document ID: US20100166080A1
- Status: Published application
- Kind: A1
- Application number: 12/625,109
- Filed: 2009-11-24
- Published: 2010-07-01
- Earliest claimed: 2008-12-26
- Inventors: Satoko MIKI
- Web page: https://patentgrep.com/patent/US20100166080A1

## CPC

- H04N 21/23406: {involving management of server-side video buffer}
- H04N 5/50: Tuning indicators; Automatic tuning control
- H04N 19/124: Quantisation
- H04N 19/152: by measuring the fullness of the transmission buffer
- H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
- H04N 19/61: in combination with predictive coding
- H04N 21/23608: {Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers}
- H04N 21/4344: {Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers}
- H04N 21/4384: {involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency}
- H04N 21/44004: {involving video buffer management, e.g. video decoder buffer or video display buffer}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

There is provided a video display apparatus capable of reducing as much as possible the time taken until an image is first displayed after inputted video data has changed, wherein, when video data inputted into an input device changes, a decode timing generating device generates a decode timing signal at a point in time when a decodable frame that can be decoded is first acquired after the change, and a display timing generating device generates a display timing signal at a point in time when a displayable frame that can be displayed is first acquired after the change.

## Claims

### Claim 1

A video display apparatus for decoding video data that includes a plurality of coded frames and displaying the decoded data, said apparatus comprising:
an input device, into which said video data is inputted;
a decode timing generating device for generating a decode timing signal that indicates decode timing at which each frame of said video data inputted into said input device is decoded;
a decode device for decoding each frame of said video data inputted into said input device based upon said decode timing signal;
a display timing generating device for generating a display timing signal that indicates display timing at which each frame decoded by said decode device is outputted; and
an output device for outputting said each decoded frame based upon said display timing signal,
wherein,
when said video data inputted into said input device changes, said decode timing generating device generates said decode timing signal at a point in time when a decodable frame that can be decoded is first acquired after the change, and
when said video data inputted into said input device changes, said display timing generating device generates said display timing signal at a point in time when a displayable frame that can be displayed is first acquired after the change.

### Claim 2 (depends on 1)

The video display apparatus according to claim 1, wherein said point in time of the first acquirement of the decodable frame is a point in time when the whole of said decodable frame is acquired.

### Claim 3 (depends on 1)

The video display apparatus according to claim 1, wherein said point in time of the first acquirement of the decodable frame is a point in time when part of said decodable frame is acquired, as well as a point in time earlier than a point in time when the whole of said decodable frame is acquired.

### Claim 4 (depends on 1)

The video display apparatus according to claim 1, wherein, upon acquirement of a decodable frame after said point in time of the first acquirement of the decodable frame, said decode timing generating device generates said decode timing signal at a corrected decode time obtained by correcting a decode time previously set with respect to said acquired decodable frame.

### Claim 5 (depends on 1)

The video display apparatus according to claim 1, wherein, upon acquirement of a displayable frame after said point in time of the first acquirement of the displayable frame, said display timing generating device generates said display timing signal at a corrected presentation time obtained by correcting a presentation time previously set with respect to said acquired displayable frame.

### Claim 6 (depends on 5)

The video display apparatus according to claim 5, wherein said corrected presentation time is a time obtained by subtracting, from the presentation time previously set with respect to said acquired displayable frame, an amount of displacement of the time when said display timing signal with respect to said first displayable frame is generated from a presentation time previously set.

### Claim 7 (depends on 5)

The video display apparatus according to claim 5, wherein said corrected presentation time is the presentation time previously set with respect to said acquired displayable frame.

### Claim 8 (depends on 5)

The video display apparatus according to claim 5, wherein said corrected presentation time is selected so as to take a stepwise approach to the presentation time previously set with respect to said acquired displayable frame.