Title:
IMAGE DISPLAY DEVICE
Document Type and Number:
Japanese Patent JPS6486769
Kind Code:
A
Abstract:
PURPOSE:To prevent a joint part from being generated on a slave picture by providing a storage means having three memories, selecting the three memories sequentially in a prescribed order synchronizing with video signals for displaying the slave picture and a master picture, writing the video signal for displaying the slave picture field by field, and reading out stored data. CONSTITUTION:A control circuit 16 selects the three memories MEM 1-3 in a memory 17 sequentially in the prescribed order synchronizing with a horizontal synchronizing signal HD1 and a vertical synchronizing signal VD1 separated from a first video signal V1 for displaying the slave picture by a synchronizing separator circuit 15. And the digital output of the first video signal V1 is written on a selected memory field by field. Also, the three memories MEM1-3 in the memory 17 are selected sequentially in the prescribed order synchronizing with synchronizing signals HD2 and VD2 separated from a second video signal for displaying the master picture, and the stored data is read out. Therefore, since to simultaneous read and write is performed in each of the memories MEM1-3, no joint part is generated on the slave picture.
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Inventors:
TAKEUCHI HISAHARU
Application Number:
JP24548687A
Publication Date:
March 31, 1989
Filing Date:
September 29, 1987
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
H04N5/265; H04N5/45; (IPC1-7): H04N5/265; H04N5/45
Attorney, Agent or Firm:
Takehiko Suzue (2 outside)