<p>The LCD resin printers I've looked at have pretty standard resolutions like for a smartphone and I understand they use the same technology. However, color LCD screens have three RGB sub-pixels for each color pixel. Check for example this magnified picture of an S-IPS LCD screen:
<a href="https://i.stack.imgur.com/bml7t.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bml7t.jpg" alt="enter image description here"></a>
It seems like they could just omit the color filter and have three grayscale pixels for each color pixel.</p>

<p>3D printing just uses one color - UV. So why don't they have resolutions that are multiples of three of the usual resolutions?</p>

<p>All results about sub-pixels that I could find are about anti-aliasing, which is different (using the existing pixels better vs. having more pixels).</p>

[{'answer_id': 10653, 'author': 'cmm', 'author_id': 2082, 'author_profile': 'https://3dprinting.stackexchange.com/users/2082', 'pm_score': 0, 'selected': False, 'text': "<p>It should be as simple as using a monochrome LCD.  You don't actually want any color filters to interfere with the UV light.</p>\n\n<p>Do we know that LCD printers are not using monochrome LCD panels?  It always seemed so obvious that I assumed it was the practice.  All you need are the front and back polarizer layer and the LCD itself to rotate the light.</p>\n"}, {'answer_id': 15040, 'author': 'FarO', 'author_id': 2338, 'author_profile': 'https://3dprinting.stackexchange.com/users/2338', 'pm_score': 1, 'selected': False, 'text': '<p>If what Thomas Sanladerer states is correct, the Mars 2 Pro (monochrome LCD, no color filter) has a layer time approximately 1/3 as long as the Mars/Pro printers (where color LCDs are used):</p>\n<p><div class="youtube-embed"><div>\r\n                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/0yZ4KiK_pl0?start=0"></iframe>\r\n            </div></div></p>\n<p>This would indicate that the light passing through the LCD, when the color filter is present, is 1/3. Put it in other words, only ONE subpixel is capable of transmitting UV light.</p>\n<p>Consequently, using all of them would not improve resolution because the other subpixels are always opaque.</p>\n'}]
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