S3C44B0X Samsung, S3C44B0X Datasheet - Page 326

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S3C44B0X

Manufacturer Part Number
S3C44B0X
Description
BGA
Manufacturer
Samsung
Datasheets

Specifications of S3C44B0X

Date_code
02+
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S3C2400 RISC MICROPROCESSOR
DITHERING AND FRC (FRAME RATE CONTROL)
For STN LCD displays(except monochrome), video data must be processed by a dithering algorithm. The DITHFRC
block has two functions, such as a Time-based Dithering Algorithm for reducing flicker and FRC(Frame Rate Control)
for displaying gray and color level on the STN panel. The main principle of gray and color level display on the STN
panel based on FRC is described. For example, to display the third gray (3/16) level from a total of 16 levels, the 3
times pixel should be on and 13 times pixel off. In other words, 3 frames should be selected among the 16 frames, of
which 3 frames should have a pixel-on on a specific pixel while the remaining 13 frames should have a pixel-off on a
specific pixel. These 16 frames should be displayed periodically. This is basic principle on how to display the gray
level on the screen, so-called gray level display by FRC(Frame Rate Control). The actual example is shown in Table
15-2. To represent the 14
times pixel-on and one time pixel-off. The other cases for all gray levels are also shown in Table 15-2.
In the STN LCD display, we should be reminded of one item, i.e., Flicker Noise due to the simultaneous pixel-on and
-off on adjacent frames. For example, if all pixels on first frame are turned on and all pixels on next frame are turned
off, the Flicker Noise will be maximized. To reduce the Flicker Noise on the screen, the average probability of pixel-
on and -off between frames should be as same as possible. In order to realize this, the Time-based Dithering
Algorithm, which varies the pattern of adjacent pixels on every frame, should be used. This is explained in detail. For
the 16 gray level, FRC should have the following relationship between gray level and FRC. The 15
always have pixel-on, and the 14
level should have 4 times pixel-on and one times pixel-off, ,,,,,,,, , and the 0
as shown in Table 15-2.
(gray level number)
Pre-dithered Data
15
14
13
12
11
10
9
8
th
gray level in the table, we should have a 6/7 duty cycle, which mean that there are 6
th
gray level should have 6 times pixel-on and one times pixel-off, and the 13
Table 15-2. Dither Duty Cycle Examples
Duty Cycle
6/7
4/5
3/4
5/7
2/3
3/5
4/7
1
(gray level number)
Pre-dithered Data
7
6
5
4
3
2
1
0
th
gray level should always have pixel-off
th
Duty Cycle
LCD CONTROLLER
gray level should
1/2
3/7
2/5
1/3
1/4
1/5
1/7
0
th
gray
15-7

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