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[Cyrilou]

Hi,
I'd like to connect my screen with d0 to d17 data pins to BT816 chip.
So I have D17-D12 for Red, D11-D6 for Green and D5-D0 for blue, 6bits/color.
Which pins should I connect to BT816 R0 to R5 or R2 to R7?
If I remember I must set REG_OUTBITS to 0x01B6. Right?

Thanks.

[BRT Community]

Hi,
Yes, REG_OUTBITS = 0x01B6 is correct for 6 bits per color (R:G:B = 6:6:6).
We recommend connecting your screen's D17–D0 lines to BT816 as follows:
•   D17–D12 → BT816 R7–R2
•   D11–D6 → BT816 G7–G2
•   D5–D0 → BT816 B7–B2
This maps the highest 6 bits of each color output from BT816 to your LCD input, ensuring better color accuracy.

Best Regards, BRT Community

[Cyrilou]

thx for these precisions.

If I want to display an image 24 bits (compressed or not) which format is recommended for my 18 bits/pixel screen?
RGB565? Is there any loss of color information?

I've tried with a 16 bits image and RGB565 and gray part has turned blue on display. Why?

[BRT Community]

Hi,
Yes, RGB565 is a commonly used 16-bit image format, but it does result in some loss of color information — especially for neutral tones like grayscale.
This is because RGB565 allocates only 5 bits for red and blue, and 6 bits for green. The imbalance in bit allocation can cause color distortion, which may lead to grayscale areas appearing bluish on the display.
If you want to preserve better color fidelity, we recommend using the ASTC compression format.
You can use our EVE Asset Builder tool to convert images into ASTC format.
For example, using 8×8 ASTC compression typically provides visually good quality while producing a smaller data size than RGB565.


Best Regards, BRT Community