AVR Freaks

I've been translating Adafruit's driver for ST7735 and saw some commands regarding power control. Here's the command code:

static const uint8_t PROGMEM
Bcmd[] = {                  // Initialization commands for 7735B screens
	18,                       // 18 commands in list:
	ST7735_SWRESET,   DELAY,  //  1: Software reset, no args, w/delay
	50,                     //     50 ms delay
	ST7735_SLPOUT ,   DELAY,  //  2: Out of sleep mode, no args, w/delay
	255,                    //     255 = 500 ms delay
	ST7735_COLMOD , 1+DELAY,  //  3: Set color mode, 1 arg + delay:
	0x05,                   //     16-bit color
	10,                     //     10 ms delay
	ST7735_FRMCTR1, 3+DELAY,  //  4: Frame rate control, 3 args + delay:
	0x00,                   //     fastest refresh
	0x06,                   //     6 lines front porch
	0x03,                   //     3 lines back porch
	10,                     //     10 ms delay
	ST7735_MADCTL , 1      ,  //  5: Memory access ctrl (directions), 1 arg:
	0x08,                   //     Row addr/col addr, bottom to top refresh
	ST7735_DISSET5, 2      ,  //  6: Display settings #5, 2 args, no delay:
	0x15,                   //     1 clk cycle nonoverlap, 2 cycle gate
	//     rise, 3 cycle osc equalize
	0x02,                   //     Fix on VTL
	ST7735_INVCTR , 1      ,  //  7: Display inversion control, 1 arg:
	0x0,                    //     Line inversion
	ST7735_PWCTR1 , 2+DELAY,  //  8: Power control, 2 args + delay:
	0x02,                   //     GVDD = 4.7V
	0x70,                   //     1.0uA
	10,                     //     10 ms delay
	ST7735_PWCTR2 , 1      ,  //  9: Power control, 1 arg, no delay:
	0x05,                   //     VGH = 14.7V, VGL = -7.35V
	ST7735_PWCTR3 , 2      ,  // 10: Power control, 2 args, no delay:
	0x01,                   //     Opamp current small
	0x02,                   //     Boost frequency
	ST7735_VMCTR1 , 2+DELAY,  // 11: Power control, 2 args + delay:
	0x3C,                   //     VCOMH = 4V
	0x38,                   //     VCOML = -1.1V
	10,                     //     10 ms delay
	ST7735_PWCTR6 , 2      ,  // 12: Power control, 2 args, no delay:
	0x11, 0x15,
	ST7735_GMCTRP1,16      ,  // 13: Magical unicorn dust, 16 args, no delay:
	0x09, 0x16, 0x09, 0x20, //     (seriously though, not sure what
	0x21, 0x1B, 0x13, 0x19, //      these config values represent)
	0x17, 0x15, 0x1E, 0x2B,
	0x04, 0x05, 0x02, 0x0E,
	ST7735_GMCTRN1,16+DELAY,  // 14: Sparkles and rainbows, 16 args + delay:
	0x0B, 0x14, 0x08, 0x1E, //     (ditto)
	0x22, 0x1D, 0x18, 0x1E,
	0x1B, 0x1A, 0x24, 0x2B,
	0x06, 0x06, 0x02, 0x0F,
	10,                     //     10 ms delay
	ST7735_CASET  , 4      ,  // 15: Column addr set, 4 args, no delay:
	0x00, 0x02,             //     XSTART = 2
	0x00, 0x81,             //     XEND = 129
	ST7735_RASET  , 4      ,  // 16: Row addr set, 4 args, no delay:
	0x00, 0x02,             //     XSTART = 1
	0x00, 0x81,             //     XEND = 160
	ST7735_NORON  ,   DELAY,  // 17: Normal display on, no args, w/delay
	10,                     //     10 ms delay
	ST7735_DISPON ,   DELAY,  // 18: Main screen turn on, no args, w/delay
255 },                  //     255 = 500 ms delay

Rcmd1[] = {                 // Init for 7735R, part 1 (red or green tab)
	15,                       // 15 commands in list:
	ST7735_SWRESET,   DELAY,  //  1: Software reset, 0 args, w/delay
	150,                    //     150 ms delay
	ST7735_SLPOUT ,   DELAY,  //  2: Out of sleep mode, 0 args, w/delay
	255,                    //     500 ms delay
	ST7735_FRMCTR1, 3      ,  //  3: Frame rate ctrl - normal mode, 3 args:
	0x01, 0x2C, 0x2D,       //     Rate = fosc/(1x2+40) * (LINE+2C+2D)
	ST7735_FRMCTR2, 3      ,  //  4: Frame rate control - idle mode, 3 args:
	0x01, 0x2C, 0x2D,       //     Rate = fosc/(1x2+40) * (LINE+2C+2D)
	ST7735_FRMCTR3, 6      ,  //  5: Frame rate ctrl - partial mode, 6 args:
	0x01, 0x2C, 0x2D,       //     Dot inversion mode
	0x01, 0x2C, 0x2D,       //     Line inversion mode
	ST7735_INVCTR , 1      ,  //  6: Display inversion ctrl, 1 arg, no delay:
	0x07,                   //     No inversion
	ST7735_PWCTR1 , 3      ,  //  7: Power control, 3 args, no delay:
	0xA2,
	0x02,                   //     -4.6V
	0x84,                   //     AUTO mode
	ST7735_PWCTR2 , 1      ,  //  8: Power control, 1 arg, no delay:
	0xC5,                   //     VGH25 = 2.4C VGSEL = -10 VGH = 3 * AVDD
	ST7735_PWCTR3 , 2      ,  //  9: Power control, 2 args, no delay:
	0x0A,                   //     Opamp current small
	0x00,                   //     Boost frequency
	ST7735_PWCTR4 , 2      ,  // 10: Power control, 2 args, no delay:
	0x8A,                   //     BCLK/2, Opamp current small & Medium low
	0x2A,
	ST7735_PWCTR5 , 2      ,  // 11: Power control, 2 args, no delay:
	0x8A, 0xEE,
	ST7735_VMCTR1 , 1      ,  // 12: Power control, 1 arg, no delay:
	0x0E,
	ST7735_INVOFF , 0      ,  // 13: Don't invert display, no args, no delay
	ST7735_MADCTL , 1      ,  // 14: Memory access control (directions), 1 arg:
	0xC8,                   //     row addr/col addr, bottom to top refresh
	ST7735_COLMOD , 1      ,  // 15: set color mode, 1 arg, no delay:
0x05 },                 //     16-bit color

The parts where it says ST7735_PWCTRx are problematic. Why is there -4.6V? There's no negative voltage! Negative voltage kills AVR, no? And this is probably for 5V Arduinos. What about 3.3V XMEGAs? This should probably be lower, but how much lower? I don't wanna burn my screen by setting up something wrong. What's with this?:

 VGH = 14.7V, VGL = -7.35V

No such board has that big voltage!! Why is this here? Do I have to change it? Sounds like it's gonna be a big explosion. I've been reading the datasheet, but it says it's a derivation of this and that and blah blah oh my... Calculus and analog electronics. My enemies.

So do I need to change that for my 3.3V XMEGA?