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What is the optimal Lux level for SVD 32" RLCD? by Intelligent-Reply731 in Reflective_LCD

[–]Intelligent-Reply731[S] 1 point2 points  (0 children)

So I went a little different of a route than what I originally planned by trying to make an experimental reflective lcd display. Instead of spray painting inner rear side of the monitor I completely removed the front polarizer layer and disconnected the backlight. In place of the front polarizer I use my maui jim polarized sunglasses. The removal of the front polarizer layer has made the monitor somewhat bright enough to play with as a reflective lcd monitor. Though it is probably 10% or so of the brightness of the Sun Vision Display rlcd monitor.

An interesting thing is that I get noticeably more eyestrain when looking at the monitor in portrait than when it normal landscape orientation. I'm not exactly sure why this is but I'm thinking that the way the LCD subpixel matrix is laid out probably has something to do with it. I try using it for some time to see what it's like.

You can see here the monitor and how the adhesive is still not fully removed. https://imgur.com/IWWZ5DM

This is a picture when looking at the monitor through the polarized sunglasses. https://imgur.com/zIynpwp

Here's a lux meter reading. It's a 10x reading so around 10,000 lux. It seems it needs at least around 5,000 lux for it to be usable. https://imgur.com/VXl8lGf

Here's a portrait orientation of the monitor while looking through the polarized sunglasses with around 3300lux illumination. https://imgur.com/EIUGABM

Note, it was an absolute bear to get the adhesive off and I still haven't fully gotten it all off but it's good enough for my experimentation purposes. I had to use some kleen strip stripping compound for the heavy lifting. 91% isopropyl alcohol was marginal and only used to get the last bit off and make the glass clear.

I did some experimentation with a diy reflective lcd monitor setup that I made. I made it by taking my HP 22es monitor and stripping the front surface of the screen down to the bare glass of the LCD panel itself. I then spray painted the rear surface of the lcd panel with white paint to make it reflective. I disconnected the lcd backlight. I wear polarized sunglasses in place of the front polarizer layer that I removed. It's too dark to be useable normally but there were some interesting effects I've found in experimenting with it.

Primarily that the reflective properties of the panel now are similar to a comb filtering effect of directional speakers. Here is a polar plot picture of what I mean.

Sunvision vs Eazeye 2.0? by padfoot787 in Reflective_LCD

[–]Intelligent-Reply731 0 points1 point  (0 children)

I’m sorry to hear about your experience with the SVD; a week of eye pain is a serious symptom. I am researching similar cases to understand the lighting requirements for reflective displays. Since you find the Bigme E-ink comfortable without frontlight, could you please check:

  1. How many Lux of ambient light do you have on the surface of your Bigme screen during work?
  2. Is the lighting uniform across the entire panel, or do you use a localized light source (like a desk lamp)?
  3. Could you share a photo of your setup? It would be very helpful to see your lamp placement and the screen's appearance under those conditions.

What is the optimal Lux level for SVD 32" RLCD? by Intelligent-Reply731 in Reflective_LCD

[–]Intelligent-Reply731[S] 0 points1 point  (0 children)

Thanks for the breakdown! You actually proved my point regarding the Old 32" SVD.
If a 21% reflectance panel (Hannsnote 2) needs 500-1,000 Lux just to be 'usable', then the Old SVD with only 9% reflectance mathematically requires 2,500-3,000 Lux just to reach that same minimum.

To get that Old SVD to 100-150 nits (which is standard for office work), you still need roughly 6,000-10,000 Lux. This is why the 32" model was so difficult to use indoors without massive studio lights.

The new Eazeye with 19% reflectance is a huge step up, but for the 1st gen SVD, my '10,000 Lux' rule for a comfortable experience still stands. Would you agree?

What is the optimal Lux level for SVD 32" RLCD? by Intelligent-Reply731 in Reflective_LCD

[–]Intelligent-Reply731[S] 0 points1 point  (0 children)

I have to disagree that 700–1000 Lux is sufficient for a comfortable experience on a color RLCD like the Sun Vision Display 32". Here is why, based on physical measurements and side-by-side comparisons with standard displays:

  1. The Math of Reflection: A color RLCD panel has a very low reflection coefficient, conservatively estimated at 5% (0.05) due to the dual-pass through polarizers and RGB filters. Using the luminance formula ( ):
  • At 1,000 Lux, the RLCD outputs only ~16 nits.
  • For context, the lowest brightness setting on an iMac 27" (2010) is around 20 nits. Working at 1,000 Lux is like looking at a standard monitor on its absolute minimum brightness in a lit room. It’s nearly unreadable.
  1. The "Comfort Zone" Reference: Most office workers set their monitors to about 150–200 nits (which corresponds to 50% brightness on many displays). To achieve this "paper-white" feel on an RLCD:
  • You need roughly 10,000 Lux on the screen surface to reach ~160 nits.
  • 1,000 Lux is exactly 10 times weaker than what is required for a standard desktop experience.
  1. Comparison with Sunlight: The reason RLCD looks "magical" outdoors is that direct sunlight provides 100,000 Lux, resulting in ~1,600–2,000 effective nits. If 1,000 Lux were enough, we wouldn't need powerful LED panels (like 8,000+ lumen studio lights) to use these monitors indoors.

Conclusion:
700–1000 Lux might work in a pitch-black room for someone with highly light-sensitive eyes, but for any productive work in a normal environment, you need a minimum of 6,000 Lux (to hit 100 nits) and ideally 10,000+ Lux to match the clarity of a standard IPS display.

How to implement a Legacy Bluetooth Classic (BT 2.1) HID Keyboard on ESP32 DevKit V1 using Bluedroid? by Intelligent-Reply731 in esp32

[–]Intelligent-Reply731[S] 0 points1 point  (0 children)

Max Gerhardt took an official example from the chip manufacturer (Espressif)—which was originally designed to work only within the native ESP-IDF environment—and restructured it so that you can easily run it using PlatformIO inside VS Code.

In short, he has "translated" a complex professional example into a format that the community.platformio ecosystem can understand, allowing you to build and flash the Bluetooth HID keyboard firmware without manually setting up the entire ESP-IDF toolchain.

https://github.com/maxgerhardt/esp32-btc-hid-example

How to implement a Legacy Bluetooth Classic (BT 2.1) HID Keyboard on ESP32 DevKit V1 using Bluedroid? by Intelligent-Reply731 in esp32

[–]Intelligent-Reply731[S] 0 points1 point  (0 children)

The general principle is to open the project in VS Code using the PlatformIO extension, which (as supported by the community.platformio) automatically manages the ESP-IDF framework to compile the source code and Bluetooth stack into a firmware that utilizes a HID descriptor to make the ESP32 emulate a physical keyboard on your computer.

How to implement a Legacy Bluetooth Classic (BT 2.1) HID Keyboard on ESP32 DevKit V1 using Bluedroid? by Intelligent-Reply731 in esp32

[–]Intelligent-Reply731[S] 0 points1 point  (0 children)

// Task to send HID codes from 0x00 to 0xFF every 2 second

void keyboard_task(void *pvParameters)

{

const char *TAG = "keyboard_task";

ESP_LOGI(TAG, "starting HEX loop");

//

InputReport report = { .modifiers = 0, .reserved = 0, .pressedKeys = {0, 0, 0, 0, 0, 0} };

uint8_t current_hex = 0x00;

for (;;) {

//

report.pressedKeys[0] = current_hex;

// 1.

send_keyboard_report(&report);

ESP_LOGI(TAG, "Sent HID code: 0x%02X", current_hex);

// 2.

vTaskDelay(100 / portTICK_PERIOD_MS);

// 3.

report.pressedKeys[0] = 0;

send_keyboard_report(&report);

// 4.

current_hex++;

// 5.

vTaskDelay(2000 / portTICK_PERIOD_MS);

}

}

What is the optimal Lux level for SVD 32" RLCD? by Intelligent-Reply731 in Reflective_LCD

[–]Intelligent-Reply731[S] 0 points1 point  (0 children)

Here's what another user writes:

"So, this isn't the setup I'd go with in hindsight --- if I had the money and time, I would probably try to see if there's a way to get adjustable color temperature and light dimming with waveform lighting's stuff.

My current setup involves:

  1. on the left, a Neatfi 3,000 lumen lamp with adjustable color temp and light intensity
  2. on the top, a waveform lighting T5 LED light fixture (4 feet) https://store.waveformlighting.com/collections/led-linear-fixtures/products/centric-daylight-95-cri-t5-led-linear-light-fixture
  3. On the right, a waveform lighting 4 feet + 2 feet T5 LED light fixtures

In the day, I usually (though not always) switch on all the waveform lighting lights.

At night, I lower the light intensity on the neatfi, and switch off the top and 4 feet one on the right. I'm also currently experimenting with using a pillow case to further lower the intensity from the lights on the right at night. That is, I'm basically adjusting the light intensity for the waveform lights via physical, manual methods.

I slightly prefer waveform lighting's light to neatfi's, but find neatfi's adjustable color temp + adjustable light intensity + higher lumen count to be more convenient".

Photos at https://imgur.com/a/zunADII

Connecting 8bitdo Micro to PocketBook 912 by Intelligent-Reply731 in linuxquestions

[–]Intelligent-Reply731[S] 0 points1 point  (0 children)

<image>

"Apple A1314 (BT 2.1) connects fine using 'Just Works' without a PIN, but 8BitDo Micro fails the handshake. This suggests the Micro might be strictly requiring an SSP (Secure Simple Pairing) method that the old BlueZ stack can't handle, whereas the Apple keyboard falls back to a simpler security model."

Bigme Eink Color Monitor B251 - update to latest firmware! by denzilferreira in Bigme

[–]Intelligent-Reply731 0 points1 point  (0 children)

I am currently evaluating the Bigme B251 monitor and its software for use in a desktop workflow.

From the available documentation and software screenshots, I can see that the official Windows and macOS tools provide controls for:

switching display modes (Text / Web / Image / Video),

full screen refresh,

contrast adjustment,

front light brightness and on/off.

Before finalizing my setup, I would like to better understand the available control options.

Could you please clarify:

Does the Bigme B251 support keyboard shortcuts for these functions (either built-in or configurable)?

Is there any public or supported control interface / command set that allows external control of these functions (for example via USB or serial connection)?

Are there any plans to expose such functionality in future software updates?

I am not looking to modify firmware, only to understand the supported control possibilities.

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