More brightness

[chrisdal2000]

Hi to all,
i have a 64x32 led

and with that code

void setup() {
// R1, G1, B1, R2, G2, B2, A, B, C, D, E, LAT, OE,CLK,
HUB75_I2S_CFG::i2s_pins _pins={25, 26, 27, 14, 12, 13, 23, 19, 5, 17, 0, 32, 33, 15,};
HUB75_I2S_CFG mxconfig(
PANEL_RES_X, // Module width
PANEL_RES_Y, // Module height
PANEL_CHAIN, // chain length
_pins, HUB75_I2S_CFG::FM6126A //FM6126A DP3246_SM5368
);

mxconfig.double_buff=true;
mxconfig.clkphase = false;
mxconfig.min_refresh_rate=60;
mxconfig.i2sspeed=HUB75_I2S_CFG::HZ_20M;

// Display Setup
dma_display = new MatrixPanel_I2S_DMA(mxconfig);
dma_display->begin();
dma_display->setPanelBrightness(255);
dma_display->clearScreen();
dma_display->fillScreen(myBLACK);

dma_display->setRotation(0);
dma_display->flipDMABuffer();
//setCpuFrequencyMhz(240);
}

int xx=0, yy, dx;
void loop() {
yy=0; dx=1;
for(int x2=0;x2<=xx;x2=x2+1){
for(int y=0;y<=yy;y=y+1){
if (dx>0)
{dma_display->drawPixel(x2,y, myBLUE );}
else
{dma_display->drawPixel(x2,y, myRED );}
}
yy=yy+dx;
if (yy==32) {dx=-1;}
if (yy==0) {dx=1;}
}
dma_display->flipDMABuffer();
delay(500);
dma_display->clearScreen();
xx=xx+1;
if (xx==64) {xx=0;}
}

show that

All is ok and the brightness is good (for internal house).
But when change the driver to HUB75_I2S_CFG::DP3246_SM5368
then take that

The image it is not same (has problem) but the brightness at middle is very very bright.
Here is and the video for 1st and 2nd code.

0-04-05-ac1687f400e1e552bbbcea86c9c083269ed866e36ab56fb2d13c864ae32e5b17_7e65ad2d231c07d4.mp4

0-04-05-1d0d3ea5e1476b6f79564d2a0f5748e7a063e50fefe0f33ce9bcecde8fbdb628_1b9c4a2efdb4099f.mp4

Can i have that brightness with FM6126A or make the DP3246_SM5368 to work ok with that brightness?

I see the code here (ESP32-HUB75-MatrixPanel-I2S-DMA.cpp)
else if (m_cfg.driver == HUB75_I2S_CFG::DP3246_SM5368)
{
row[ESP32_TX_FIFO_POSITION_ADJUST(x_pixel)] = 0x0000;
}
else
why show all data at row 0.

Sorry for the english.

[board707]

Can i have that brightness with FM6126A or make the DP3246_SM5368 to work ok with that brightness?

Shortly - no.
When the image is displayed on the entire matrix, the total brightness is divided into all rows and therefore the brightness of each pixel is less. In the second case, the pixels of all lines is displayed on a single line, so it looks brighter, but all other lines do not light up at all

[chrisdal2000]

thanks for the reply.

This means the hardware is ok and the led can be more brightness from normal. The problem is the software.
There are a other way to have more brightness?

[board707]

The problem is the software. There are a other way to have more brightness?

No, there is no problem with the software. This is how the panels works - they show the image by quickly switching between lines. That means each line is lit only 1/T part of the total time, so the visible brightness of each line is T times less than the maximum brightness of an individual diode.
There is no way to light every led on panel with maximum brightness at the same time.

[board707]

By the way, that the greater the number of scans in the matrix - for example, 16s for 64x32 16 scans - the lower its brightness. One of the reasons why manufacturers produce matrices with multi-line scanning - for example, the same 64x32, but with scan 8s - is to increase their brightness.
Another thing from this - one matrix 64x64 32s has brightness only a half relatively to two 64x32 16s panels (with the same leds and drivers) .