At present, there are three different light guide dot placement processes in the industry: Printing light guide dot, laser engraving light guide dot and mould hot pressing light guide dot. The production efficiency and light guide effect of LGF made by mould hot pressing process are relatively good. Based on the mould hot pressing process, we independently developed a five-station roller press. The LGF light guide plate made of PC (PC Specification) material with better flexibility has a very good light guide effect. The distinction of different production network process are listing as follows:
| Item | Hot-pressing process | Laser process | Printing process |
| Working method | A mold is used to hot press the luminescent dot on the surface of LGF | The LGF surface is marked with a laser dot | White luminescent ink is used to print dots on the surface of the LGF |
| Samples production time | Mold making is required, and the lead time would be a little longer | The lead time is shorter | Need to do dot screen, using screen printing, sample speed is slow |
| Dot size | Min 0.05mm | / | Min 0.15mm |
| Press key request | Suitable for all keys | Suitable for not very transparent keys | Suitable for all keys |
| Adjustment of uniformity | The adjustment is complicated and the mold needs to be re-opened | The adjustment is fast, but unstable | Adjustment speed is not fast, need to re-make the screen |
| Production efficiency | Open mold for production, faster production | Laser dotting speed is slow, production is slow | Screen printing, faster speed |
And below are some photos of dot with different process:
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