参数资料
| 型号： | AC164127-9 |
| 厂商： | Microchip Technology |
| 文件页数： | 5/34页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO GRAPH TRULY7 800X480 |
| 标准包装： | 1 |
| 系列： | PICtail™ Plus |
| 主要目的： | 显示器，LCD 显示器 |
| 已用 IC / 零件： | S1D13517 |
| 主要属性： | 7" WVGA TFT LCD |
| 次要属性： | 电阻式 4 线触控屏幕 |
| 已供物品： | 模块 |
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AN1368
Some of the important properties of display
technologies are explained as follows:
? Frame Rate: The number of times the display
screen is refreshed in a second (this parameter
does not reflect the refresh capacity of the
microcontroller but only the capacity of the display
glass).
? Ghosting: When the screen is changed, the
previous frame is visible with lower intensity for a
fraction of time, which appears to be the ghost of
the current screen.
? HBLANK and VBLANK: Horizontal and vertical
blanking periods, where the display is not updated.
For more information, refer to Section 43 . “Graph-
ics Controller Module (GFX)” (DS39731) in the
“ PIC24F Family Reference Manual” .
? Backlight: For TFT/STN LCDs, backlight is
necessary to view the display. It could be either
CCFL or LED type.
? Contrast: It is defined as the ratio of intensities of
white to black on the display. The higher the
contrast, the better is the display quality.
? Viewing Angle: It is the horizontal or vertical
angle within which the display is properly
viewable.
The display glass has no inherent memory and must be
constantly updated with pixel data in each row and
column, failing which, the display will go blank (similar
to DRAM refresh). This refreshing of the display data is
handled by the display controller.
Display Controller
The display glass must be constantly refreshed by
feeding the horizontal and vertical pixel data repeatedly
from the frame buffer. This task is performed by the
display controller. It fetches the data from the frame
buffer, decodes it to the required bit format and feeds it
to the display glass, along with proper control signals.
The display controller must adhere to the timing
requirements of the display glass.
? 2011 Microchip Technology Inc.
Frame Buffer
The frame buffer is a memory (usually a RAM), which
holds the data to be shown on the display screen and
acts as the data source for the display controller. The
required size of the frame buffer depends on the
resolution and color depth. The minimum requirement
is that it should hold the data required to display one full
frame and must support the scan rate (preferred
refresh rate as per the data sheet of the display glass)
of the display controller.
EQUATION 1:
Frame Buffer Size Required (Bytes) = Number of Pixels x
Color Depth (Bits)/8
EXAMPLE 1:
For a QVGA (320x240) display using a 16 BPP color
depth:
Frame Buffer = 320 x 240 x 16/8
= 153,600 Bytes
= 150 Kbytes
EXAMPLE 2:
For a WQVGA (480x272) display using a 16 BPP
color depth:
Frame Buffer = 480 x 272 x 16/8
= 261,120 Bytes
= 255 Kbytes
EXAMPLE 3:
For a QCIF (176x144) display using an 8 BPP color
depth:
Frame Buffer = 176 x 144 x 8/8
= 25,344 Bytes
= 24.75 Kbytes
DS01368A-page 5
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