From the invisible home cinema to the 2 m high iPhone, via the PS5 Slim a year before Sony, Matt from the YouTube channel DIY Perks has proven that no DIY challenge scares him. Latest feat to date, building a screen rivaling the best current [abc]Oled[/abc] diffusers, starting with an LG [abc]LCD[/abc] TV dating back eleven years and an old overhead projector.
Multiply the number of zones of an LCD panel by associating it with a video projector££££
Main defect of old LCD screens, low contrast and therefore shallow blacks. The backlighting sends out too much brightness, even if zones block the light automatically to limit it depending on the presence of black in the image. Problem, the resolution of the backlighting system is too low (68 x 38 in the example of this video), hence too few zones. How then to control more precisely this variation of brightness according to the zones to be turned off? Increase the number of the latter of course. And it is on this basis that Matt decided to replace the backlighting panel with… an overhead projector. Yes, the device he has offers a resolution much higher than that of the original television backlighting, enough so that the black zones are well delimited, without the annoying artifacts observed on the original LCD.
Matt "Geo Trouvetout"££££
We'll spare you the technical details that you will find in the video retracing the construction of this clever device, but in the end, Matt manages to replace the backlighting of his television with an overhead projector. A software trick even allows him to create in real time the black and white projection perfectly corresponding to the image broadcast. In summary, an incredible contrast that has little to be ashamed of compared to the best Oled TVs of the moment. Hats off.
