ST7735 wrong color

Other Hardware Displays
1

Hello. I use TFT_eSPI with my ESP32 in Arduino IDE, I tried display bmp but get not bright colors.

on display:

247600287-8f41a71d-9ee0-43ef-b29e-65c74fa7808e
247600287-8f41a71d-9ee0-43ef-b29e-65c74fa7808e1280×959 82.2 KB

in original:
247600485-33a7fdcc-7ecd-4782-ab80-9e8a399f5185

247600488-a1b4156c-b117-4210-81f0-e2b065a23038

I thought that trouble was in img convert, but I try jpg from example and get the same result:

247601049-dc5b5fec-31e2-49e2-b9ff-5a95549ad8ca
247601049-dc5b5fec-31e2-49e2-b9ff-5a95549ad8ca960×1280 177 KB

I use ST7735 display https://www.aliexpress.com/item/1005004565692996.html?spm=a2g0o.order_list.order_list_main.162.6e921802MyEB6N

247601988-7ee2c05a-4853-4530-b0ce-9e821e234630
247601988-7ee2c05a-4853-4530-b0ce-9e821e2346301137×555 125 KB

and my Setup.h:

#define ST7735_DRIVER

#define ST7735_REDTAB

#define TFT_WIDTH  320
#define TFT_HEIGHT 240

#define TFT_RGB_ORDER TFT_RGB


#define TFT_MISO 19
#define TFT_MOSI 23
#define TFT_SCLK 18
#define TFT_CS   15  // Chip select control pin
#define TFT_DC    2  // Data Command control pin
#define TFT_RST   4  // Reset pin (could connect to RST pin)


#define LOAD_GLCD   // Font 1. Original Adafruit 8 pixel font needs ~1820 bytes in FLASH
#define LOAD_FONT2  // Font 2. Small 16 pixel high font, needs ~3534 bytes in FLASH, 96 characters
#define LOAD_FONT4  // Font 4. Medium 26 pixel high font, needs ~5848 bytes in FLASH, 96 characters
#define LOAD_FONT6  // Font 6. Large 48 pixel font, needs ~2666 bytes in FLASH, only characters 1234567890:-.apm
#define LOAD_FONT7  // Font 7. 7 segment 48 pixel font, needs ~2438 bytes in FLASH, only characters 1234567890:-.
#define LOAD_FONT8  // Font 8. Large 75 pixel font needs ~3256 bytes in FLASH, only characters 1234567890:-.
#define LOAD_GFXFF  // FreeFonts. Include access to the 48 Adafruit_GFX free fonts FF1 to FF48 and custom fonts

#define SMOOTH_FONT


#define SPI_FREQUENCY  40000000

Can you help what is wrong? Thanks!

2

Green and blue make cyan. Red and blue make magenta. The blue is too strong.

3

what you mean?

4

add
add577×722 129 KB

5

Did you ever try something else, e.g. BGR?

1 Like
6

yes, I try BGR - color changed to blue

7

A search on "inverted colors ST7735" seems like the tft you have was not made for the library you are using. Finding the right library might solve it. "Color mixing" is another solution, suggested here:

8

The S7735 has 4 variants, S7735B, S7735R green tab, S7735R red tab and S7735S black tab, choosing the wrong one in the header would mess with the final colors. Look closely at your display and see if it has any of the above numbers printed on the back.

1 Like
9

The BLUE signal line is stuck ON. This adds blue to EVERYTHING resulting in the display you see. Check the wiring and scope to blue line. If inactive, problem is with driver. If active, replace display.

12

This help me a lot, thanks.

13

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