Integrated circuit for use in plasma display panel, access control method, and plasma display system
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsMasaki Maeda, Naoki Ootani, Tokuzo Kiyohara
Life of this patent
Estimating the term…
Abstract
A plasma display system restricts peak data traffic when a shared memory is used. In the plasma display system, a control unit prohibits a moving picture decoder from accessing a shared memory while an SF reading unit is reading, from the shared memory, SF pixel data which is information about respective cells to be lit in a plurality of subfields. On the other hand, the control unit permits the moving picture decoder to access the shared memory while the SF reading unit is not reading the SF pixel data from the shared memory during a sustain discharge period.
Claims8
An integrated circuit for use in a plasma display panel, comprising:
- a decoder that reads encoded moving picture data from a shared memory, decodes the encoded moving picture data to obtain decoded data, and stores the decoded data directly in the shared memory using a direct connection to the shared memory,
- wherein the shared memory is shared by the decoder, a converter, a reader, and an access controller;
- the converter reads the decoded data from the shared memory, converts the decoded data into subfield data, and stores the subfield data directly in the shared memory using a direct connection to the shared memory;
- the reader reads the subfield data directly from the shared memory using a direct connection to the shared memory;
- and
- the access controller:
- (i) restricts access to the shared memory from the decoder during a first period in which a cell among plasma display panel cells is specified as a cell to be illuminated according to the subfield data;
- and
- (ii) restricts access to the shared memory from the reader during a second period in which the specified cell is illuminated.
A method for controlling an access to a shared memory in an integrated circuit for use in a plasma display, wherein the shared memory is shared by a moving picture decoder, a converter, and a reader included in the plasma display, the method comprising the steps of:
- a decoding step, performed by the moving picture decoder, of reading the encoded moving picture data from the shared memory, converting the encoded moving picture data into decoded data, and storing the decoded data directly in the shared memory using a direct connection to the shared memory;
- a conversion step, performed by the converter, of reading the decoded data from the shared memory, converting the decoded data into the subfield data, and storing the subfield data directly in the shared memory using a direct connection to the shared memory;
- a reading step, performed by the reader, of reading the subfield data directly from the shared memory using a direct connection to the shared memory;
- and
- a restriction step of:
- (i) restricting access to the shared memory from the moving picture decoder during a first period in which a cell among plasma display panel cells is specified as a cell to be illuminated according to the subfield data;
- and
- (ii) restricting access to the shared memory from the reader during a second period in which the specified cell is illuminated.
A plasma display system comprising:
- a decoder that reads encoded moving picture data from a shared memory, decodes the encoded moving picture data to obtain decoded data, and stores the decoded data directly in the shared memory using a direct connection to the shared memory,
- wherein the shared memory is shared by the decoder, a converter, a reader, and an access controller;
- the converter reads the decoded data from the shared memory, converts the decoded data into subfield data, and stores the subfield data directly in the shared memory using a direct connection to the shared memory;
- the reader reads the subfield data directly from the shared memory using a direct connection to the shared memory;
- and
- the access controller:
- (i) restricts access to the shared memory from the decoder during a first period in which a cell among plasma display panel cells is specified as a cell to be illuminated according to the subfield data;
- and
- (ii) restricts access to the shared memory from the reader during a second period in which the specified cell is illuminated.
Dependencies are inferred from the claim text.