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AN1368
GRAPHICS SUBSYSTEM HARDWARE
The hardware components required for a graphic appli-
cation, with their interconnection and design decisions,
are described in the following subsections.
COMPONENTS OF A GRAPHICS
SYSTEM
There are four basic components for any embedded
graphics system, as illustrated in Figure 6 . They
consist of the display glass, display controller, frame
buffer and the microcontroller.
FIGURE 6:
THE FOUR BASIC COMPONENTS OF A GRAPHICS SYSTEM
Microcontroller
Frame
Buffer
Display
Controller
Display Glass
Display Glass
Display glass is the device which displays a sequence of
colors on the pixels and also converts the digital
representation of colors to actual colors. The term, color,
includes grayscale. Generally, the types of displays used
are TFT LCDs, CSTN/MSTN LCDs or OLED/AMOLEDs.
All the LCD modules include gate and source drivers to
drive the voltage and current for displaying all the
pixels. Table 1 gives a brief comparison of different
display technologies.
TABLE 1:
COMPARISON OF DIFFERENT DISPLAY TECHNOLOGIES (1)
Property
Frame Rate
Ghosting
HBLANK and VBLANK
Backlight
Cost
Typical Size for QVGA
TFT LCD
High
No
Yes
Required
Medium
1.5" to 5.7"
STN (CSTN/MSTN)
Low
Yes
No
Required
Low
1.5" to 5.7"
AMOLED
High
No
Yes
Not Required
High
Up to 2.8"
(320x240) Resolution
Contrast
Power Consumption
Viewing Angle
Medium
High
Medium
Low
Medium
Medium
High
Low
High
Note 1:
Data mentioned in this table may change due to constant changes or advancements in the display
technology.
DS01368A-page 4
? 2011 Microchip Technology Inc.
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