DLP230NP: Smartwatch setup

Hello Hosam,

I understand that this smart watch is wearable and battery operated.  Pleas correct me if I misunderstood.

It will be very helpful if you could share the high level requirements for the product then we help you choose correct product.

Could you please share the following:

1. Power budget for projection

2. Size  along with desired form factor

3. Brightness - it will be define by how large image is required and ambient light condition

3. Resolution 

4. Is it color display? Is monochrome acceptable?

Please note that there is trade-off for all above parameters, for example the size and power goes up with resolution and brightness. For such wearable battery operated product, I would priorities size and power.   Once we defined the size and power then we can choose the right product (resolution) and maximize brightness within those parameters.

regards,

Vivek

Hello Sam,

Thank you for your patience.

The product concept looks exciting and the requirements for an optical engine are challenging. 

I am not aware of an existing optical engine which can meet your requirement. You need to work a design house or an optical engine manufacture to design and develop a custom optical engine for your application. You can download the DLP  Third party tool from the following link:

https://www.ti.com/tool/DLP-OMM-SEARCH

Please reach out  to design houses directly to explore feasibility of  design & development.

I could assist you in defining the high level requirement for the optical engine. Please refer to the application note on  "TI DLP® Pico System Design: Optical Module Specifications" for definition of terms used optical engine specification.

https://www.ti.com/lit/an/dlpa078b/dlpa078b.pdf

High level Optical engine specification:

1. Size - This is the most critical factor. You may want to define the max  X, Y and Z dimension for optical engine after accommodating space  for battery and electronics. Assuming watch volume ( 40mmx40mmx 10mm) and 33% space for projector - 30mmx15mmx10 mm is good starting point for optical engine. This may be achievable for small DMDs like DLP160CP, DLP2010 and DLP230GP. Our customers are able to design small optical engine in this formfactor for AR glass application.

2. Throw ratio - Lets assume when you expand the projection area to 120mm,  it also raises in height to 20-25 mm. The throw ratio 

                for 40 mm image at a distance of 10 mm = 0.25 throw ratio

               for 120 mm image at a distance of 25 mm = 0.20 throw ratio

  This is a very challenging requirement especially in this formfactor /size.

3. Brightness - You will able support a good visual experience with 1-3 lumens light out. For 40mm display you will  be able to achieve > 200 nits with 1 lumen light output. For 120 mm screen , 3-4 lumens light output will give ~150 nits experience if your glass has ~1.25 screen gain.

4. Power budget - 360mAH battery (3.7 v) and say 5 hour in use operation, give  power budget for whole system ~260 mW. This requirement along with size will limit  resolution for display.

4. Resolution - Best you can get within  size and power budget.

Hope this are helpful. Please let me know how it goes.

This product concept is exciting and will require innovative display design.

regards,

Vivek