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comparison FC-handset-spec @ 82:e279a924f7a3

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FC-handset-spec: update for Formike LCD modules being here
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 12 Nov 2021 20:44:41 +0000
parents 3e32484f8832
children 8df29c96327a
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81:3e32484f8832 82:e279a924f7a3
131 131
132 Formike KWH020ST23-F01 is an LCD module that was discovered by Mother Mychaela 132 Formike KWH020ST23-F01 is an LCD module that was discovered by Mother Mychaela
133 in May-June of 2021, and it satisfies all of our requirements. In June of 2021 133 in May-June of 2021, and it satisfies all of our requirements. In June of 2021
134 we received sample pieces, then we designed a test board for the purpose of 134 we received sample pieces, then we designed a test board for the purpose of
135 evaluating this new LCD, connecting it to our Luna interface from 2020. Our 135 evaluating this new LCD, connecting it to our Luna interface from 2020. Our
136 lunalcd2 test board was finally assembled in August, all tests passed, and as 136 lunalcd2 test board was finally assembled in August, all tests passed, and in
137 of September we are in process of ordering a larger batch of these finally 137 September of 2021 we have bought 100 pcs of this finally chosen LCD module.
138 chosen Formike LCD modules. 138 This stash of 100 LCD modules is expected to be sufficient as a lifetime buy.
139 139
140 1.4.3. Backlight and readability considerations 140 1.4.3. Backlight and readability considerations
141 141
142 Out of the various pre-existing mobile phones which I (Mychaela) have 142 Out of the various pre-existing mobile phones which I (Mychaela) have
143 experienced, there have been 3 different kinds of LCDs in terms of how display 143 experienced, there have been 3 different kinds of LCDs in terms of how display
1604 be best to switch to it now, starting with Venus. 1604 be best to switch to it now, starting with Venus.
1605 1605
1606 3.5. LCD module and backlight 1606 3.5. LCD module and backlight
1607 1607
1608 The LCD module on FC Venus will be Formike KWH020ST23-F01, the same LCD module 1608 The LCD module on FC Venus will be Formike KWH020ST23-F01, the same LCD module
1609 which we have settled on for the actual FC handset. As of 2021-09, we are in 1609 which we have settled on for the actual FC handset. In 2021-09 we made a
1610 the process of ordering 100 pcs of this LCD module (the payment has already been 1610 lifetime buy of 100 pcs of this LCD module, thus we are now past the point of
1611 made, and we are waiting for the shipment to clear customs), thus we are now 1611 considering different candidate LCD modules. Our chosen Formike LCD module is
1612 past the point of considering different candidate LCD modules. Our chosen 1612 almost perfect for development boards such as FC Venus; the only blemish is
1613 Formike LCD module is almost perfect for development boards such as FC Venus; 1613 that in the absence of additional mechanical restraints, an elastic force that
1614 the only blemish is that in the absence of additional mechanical restraints, an 1614 originates somewhere in the area of the folded-under FPC tail pushes the bottom
1615 elastic force that originates somewhere in the area of the folded-under FPC tail 1615 of the module upward, away from the PCB, acting against both gravity and
1616 pushes the bottom of the module upward, away from the PCB, acting against both 1616 adhesive forces. However, we have a planned workaround: we are working with a
1617 gravity and adhesive forces. However, we have a planned workaround: we are 1617 local-to-us mechanical engineering company to produce a custom retaining
1618 working with a local-to-us mechanical engineering company to produce a custom 1618 bracket; with the addition of this bracket, the mounting of our LCD module is
1619 retaining bracket; with the addition of this bracket, the mounting of our LCD 1619 expected to become secure enough for development board purposes.
1620 module is expected to become secure enough for development board purposes.
1621 1620
1622 The backlight circuit design of section 1.4.4.1, which is hoped to be final, is 1621 The backlight circuit design of section 1.4.4.1, which is hoped to be final, is
1623 being included in the Venus board design. Specific LED currents don't need to 1622 being included in the Venus board design. Specific LED currents don't need to
1624 be finalized for Venus PCB layout or PCB fabrication; resistor values that set 1623 be finalized for Venus PCB layout or PCB fabrication; resistor values that set
1625 these currents will only need to be finalized when the time comes to populate 1624 these currents will only need to be finalized when the time comes to populate