2001 OSRAM Opto Semiconductors Inc. San Jose, CA
SCE5780/1/2/3/4/5/6
www.inneon.com/opto 408-456-4000
OSRAM Opto Semiconductors GmbH & Co. OHG Regensburg, Germany
www.osram-os.com +49-941-202-7178
12
August 1, 2001-18
Additional contrast enhancement is gained by shading the dis-
plays. Plastic band-pass lters with built-in louvers offer the
next step up in contrast improvement. Plastic lters can be
improved further with anti-reective coatings to reduce glare.
The trade-off is fuzzy characters. Mounting the lters close to
the display reduces this effect. Take care not to overheat the
plastic lter by allowing for proper air ow.
Optimal lter enhancements are gained by using circular
polarized, anti-reective, band-pass lters. The circular polariz-
ing further enhances contrast by reducing the light that travels
through the lter and reects back off the display to less than
1.0%.
Several lter manufacturers supply quality lter materials.
Some of them are: Panelgraphic Corporation, W. Caldwell, NJ;
SGL Homalite, Wilmington, DE; 3M Company, Visual Products
Division, St. Paul, MN; Polaroid Corporation, St. Paul, MN;
Polaroid Corporation, Polarizer Division, Cambridge, MA; Marks
Polarized Corporation, Deer Park, NY, Hoya Optics, Inc., Fre-
mont, CA.
One last note on mounting lters: recessing displays and
bezel assemblies is an inexpensive way to provide a shading
effect in overhead lighting situations. Several Bezel manufac-
turers are: R.M.F. Products, Batavia, IL; Nobex Components,
Grifth Plastic Corp., Burlingame, CA; Photo Chemical Prod-
ucts of California, Santa Monica, CA; I.E.E.-Atlas, Van Nuys,
CA.
Microprocessor Interface
The microprocessor interface is through the serial port, SPI port
or one out of eight data bits on the eight bit parallel port and
also control lines SDCLK and LOAD.
Power Up Sequence
Upon power up display will come on at random. Thus the dis-
play should be reset at power-up. The reset will set the
Address Register to Digit 0, User RAM is set to 0 (display
blank) the Control Word is set to 0 (100% brightness) and the
internal counters are reset.
Loading Data into the Display
Use following procedure to load data into the display:
1. Power up the display.
2. Bring RST low (600 ns duration minimum) to clear the Multi-
plex Counter, Address Register, Control Word Register, User
Ram and Data Register. The display will be blank. Display
brightness is set to 100%.
3. If a different brightness is desired, load the proper bright-
ness opcode into the Control Word Register.
4. Load the Digit Address into the display.
5. Load display row and column data for the selected digit.
6. Repeat steps 4 and 5 for all digits.
Data Contents for the Word “ABCDEFGH”
Step
D7 D6
D5
D4 D3
D2
D1
D0 Function
A
B
1
0
1
00
0
00
0
CLEAR
100% BRIGHTNESS
1
2
3
4
5
6
7
8
1
0
1
00
0
00
0
100
01
0
1
0
10
0
1
11
1
0
001
1
0
001
10
0
1
DIGIT D0 SELECT
ROW 0 (A)
ROW 1 (A)
ROW 2 (A)
ROW 3 (A)
ROW 4 (A)
ROW 5 (A)
ROW 6 (A)
9
10
11
12
13
14
15
16
10
1
00
0
00
0
001
1
111
1
0
001
10
0
1
0
10
0
1
10
0
1
11
1
DIGIT D1 SELECT
ROW 0 (B)
ROW 1 (B)
ROW 2 (B)
ROW 3 (B)
ROW 4 (B)
ROW 5 (B)
ROW 6 (B)
17
18
19
20
21
22
23
24
1
0
1
0
00
0
1
0
111
0
1
000
10
0
10
0
1
0
000
01
0
00
1
DIGIT D2 SELECT
ROW 0 (C)
ROW 1 (C)
ROW 2 (C)
ROW 3 (C)
ROW 4 (C)
ROW 5 (C)
ROW 6 (C)
25
26
27
28
29
30
31
32
1
0
1
0
011
11
1
0
10
0
1
0
001
10
0
1
10
0
1
0
001
1
110
DIGIT D3 SELECT
ROW 0 (D)
ROW 1 (D)
ROW 2 (D)
ROW 3 (D)
ROW 4 (D)
ROW 5 (D)
ROW 6 (D)
33
34
35
36
37
38
39
40
1
0
1
0
100
11
1
10
0
1
0
000
11
1
0
10
0
1
0
000
1
111
DIGIT D4 SELECT
ROW 0 (E)
ROW 1 (E)
ROW 2 (E)
ROW 3 (E)
ROW 4 (E)
ROW 5 (E)
ROW 6 (E)
41
42
43
44
45
46
47
48
1
0
1
0
101
11
1
10
0
1
0
000
11
1
0
10
0
1
0
000
1
0
000
DIGIT D5 SELECT
ROW 0 (F)
ROW 1 (F)
ROW 2 (F)
ROW 3 (F)
ROW 4 (F)
ROW 5 (F)
ROW 6 (F)
49
50
51
52
53
54
55
56
1
0
1
0
110
01
1
0
10
0
1
0
000
10
0
10
0
1
0
001
0
1
110
DIGIT D6 SELECT
ROW 0 (G)
ROW 1 (G)
ROW 2 (G)
ROW 3 (G)
ROW 4 (G)
ROW 5 (G)
ROW 6 (G)
57
58
59
60
61
62
63
1
0
1
0
111
10
0
1
10
0
1
0
001
11
1
10
0
1
0
001
1
0
001
DIGIT D7 SELECT
ROW 0 (H)
ROW 1 (H)
ROW 2 (H)
ROW 3 (H)
ROW 4 (H)
ROW 5 (H)
ROW 6 (H)