5

CL VFDs Application Note APN130

5. DESIGN GUIDANCE

Standard CL VFD's line up, covers most of popular dot configurations. If you do not find a suitable CL VFD dot configuration in our standard line up, we will be pleased to design a custom CL VFD as well. Please use the following general design guide for your initial design.

5.1 Number of Silicon Chips and Glass Package Size

There are 2 types of silicon chips available as of August 1998, their dot pitches are 0.347mm and 0.308mm. Both of them have 16 x 16 dot matrix configuration per chip. Minimum number of the chip per VFD tube is "ONE", and the maximum is up to about 20 chips per array or 40 chips for 2 rows.
The relationship between the number of chips and the outer dimension of glass package is shown in the following table.

Table 4 Number of Chips and Glass Package Size

Dot Pitch 0.347mm 0.308mm

No. of
Chips Dot
Config. Display
Area
(mm) Outer
Dimension
LxH(mm) Standard
Item Display
Area
(mm) Outer
Dimension
LxH(mm) Standard
Item

4 64x16

19.6x4.8 45.0x16.0 MW06416D

5 80x16

24.5x4.8 50.0x16.0

6 96x16

29.4x4.8 55.0x16.0

8 128x16 44.2x5.4 70.0x17.0 MW12816A 39.3x4.8 62.0x16.0 MW12816D

12 192x16

59.1x4.8 85.0x16.0

16 256x16 88.6x5.4 115.0x17.0 MW25616L 78.7x4.8 102.0x16.0 MW25616N^*

4x2 64x32

19.6x9.7 45.0x20.5

5x2 80x32

24.5x9.7 50.0x20.5

8x2 128x32 44.2x11.0 70.0x22.5 MW12832D 39.3x9.7 62.0x20.5 MW12832G

12x2 192x32

59.1x9.7 85.0x20.5 MW19232B

16x2 256x32 88.6x11.0 115.0x22.5 MW25632C 78.7x9.7 102.0x20.5 MW25632E^*

Note: * is under development. (4Q 1998)

5.2 Multi-Line Chip Array

Required space between lines of silicon chips is as follows.

Table 5 Minimum Space Between Line

Condtions No wire bonding area between line One wire bonding area between line Two wire bonding area between line

Minimum
Gap

5.3 Combination with Conventional VFD's Display Pattern

The silicon chips of CL VFDs can be combined with conventional custom designed display pattern as shown in Figure 15.
The silicon chips can also be combined with BD VFD technologies. (c.f.APN140). Please contact us for details.

Fig.15 Combination with Conventional VFD's Display Patten Pattern

5.4 Lead pins

The standard lead pin form of the CL VFDs is 6.0mm length and 2.0mm pitch. The dimensions of standard lead pin is shown in Figure 16. Custom lead pin from is also available upon request.

Fig.16 Standard Lead Pin Form

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