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Microchip Technology AC164127-9 Data Sheet

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AN1368
DS01368A-page 4
 2011 Microchip Technology Inc.
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 
consist of the display glass, display controller, frame
buffer and the microcontroller.
FIGURE 6:
THE FOUR BASIC COMPONENTS OF A GRAPHICS SYSTEM
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. 
 gives a brief comparison of different
display technologies.
Display Glass
Frame 
Buffer
Display 
Controller
Microcontroller
TABLE 1:
COMPARISON OF DIFFERENT DISPLAY TECHNOLOGIES
(1)
Property
TFT LCD
STN (CSTN/MSTN)
AMOLED
Frame Rate
High
Low
High
Ghosting
No
Yes
No
HBLANK and VBLANK
Yes
No
Yes
Backlight
Required
Required
Not Required
Cost
Medium
Low
High
Typical Size for QVGA 
(320x240) Resolution
1.5" to 5.7"
1.5" to 5.7"
Up to 2.8"
Contrast
Medium
Low
High
Power Consumption
High
Medium
Low
Viewing Angle
Medium
Medium
High
Note 1:
Data mentioned in this table may change due to constant changes or advancements in the display 
technology.