Unrecognized deferred tax assets related to loss carry-forward, investment credits and deductible temporary differences were summarized as follows:
| December 31 | ||||||||||||
| 2016 | 2017 | |||||||||||
| NT$ | NT$ | US$ (Note 4) | ||||||||||
| Loss carry-forward | $ | 652,593 | $ | 542,054 | $ | 18,288 | ||||||
| Investment credits | 280,068 | - | - | |||||||||
| Deductible temporary differences | 904,441 | 712,141 | 24,026 | |||||||||
| $ | 1,837,102 | $ | 1,254,195 | $ | 42,314 | |||||||