Concept - Epson S1D13506 Technical Manual

Page 200
15 SwivelView™

15.1 Concept

15.2 90° SwivelView™
S1D13506
X25B-A-001-12
Most computer displays are refreshed in landscape – from left to right and top to bottom.
Computer images are stored in the same manner. SwivelView™ is designed to rotate the
displayed image on an LCD by 90°, 180°, or 270° in a clockwise direction. 90° rotation is
also available on CRT.
The rotation is done in hardware and is transparent to the user for all display buffer reads
and writes. By processing the rotation in hardware, SwivelView™ offers a performance
advantage over software rotation of the displayed image.
90° SwivelView™ uses a 1024 × 1024 pixel virtual window. The following figures show
how the display buffer memory map changes in 90° SwivelView™. The display is
refreshed in the following sense: C–A–D–B. The application image is written to the
S1D13506 in the following sense: A–B–C–D. The S1D13506 rotates and stores the
application image in the following sense: C–A–D–B, the same sense as display refresh.
The user can read/write to the display buffer naturally, without the need to rotate the image
first in software. The registers that control the panning and scrolling of the panel window
are designed for a landscape window. However, it is still possible to pan and scroll the
portrait window in 90° SwivelView™, but the user must program these registers somewhat
differently (See Section 15.2.1, "Register Programming" on page 201).
Epson Research and Development
Vancouver Design Center
Hardware Functional Specification
Issue Date: 02/03/26