for example, in lib m5stickc
it send to register ST7735_PWCTR1 with 3 parameters [0xA4, 0x04, 0x84]

but in the datasheet st7735sv

the register PWCTR1 only accept 2 parameters.

in the comment, it said "-4.6v" .
but the 2nd paramter 0x4 is indicate "-4.5v"

for lib M5GFX, src/lgfx/v1/panel/Panel_ST7735.hpp
class Panel_ST7735S.
it still send to register CMD_PWCTR1 with 3 parameters [0xA2, 0x02, 0x84]

so what is the correct value for those voltage (VGH, VGL, AVDD, GVCL, GVCD)

I can't find the schematic of m5stickc, so I can't find the right value for those voltage.

in the datasheet st7735sv , page 165,
it said "The deviation value of VGH/ VGL between with Measurement and Specification: Max <= 1V".