NHD-5.0-800480TF-ATXL-CTP Rev 1E will flicker once when powered on
Hi ,
I used the display model is NHD-5.0-800480TF-ATXL-CTP, I know your company has changed the glass and product series number from Rev 10 to Rev 1E.
As the picture No2 show, new display to be compatible with existing platforms driving the old display, I know you change LCD driver chip from ILI6122 to ILI6137A, I compare these two chips about Timing, it's same.
But I meet a problem: when the new display power on , the new display will happen flicker, the time would short, about 1~2 sencond ,the phnomenon as the picture No1 show, after fininshing power on , the new display would normal, whatever touch or display. Before I used the same LCD driver and same Timing parameters on NHD-5.0-800480TF-ATXL-CTP Rev 10, this problem would disapper.
This is my dts file and driver parameters:
panel {
compatible = "ti,tilcdc,panel";
pinctrl-names = "default";
pinctrl-0 = <&ixd_lcdc0_pins_default>;
status = "okay";
panel-info {
ac-bias = <255>;
ac-bias-intrpt = <0>;
dma-burst-sz = <16>;
bpp = <32>;
fdd = <0x80>;
sync-edge = <0>;
sync-ctrl = <1>;
raster-order = <0>;
fifo-th = <0>;
invert-pxl-clk = <1>;
};
display-timings {
800x480p62 {
hactive = <800>;
vactive = <480>;
hback-porch = <88>;
hfront-porch = <40>;
hsync-len = <48>;
vback-porch = <32>;//<40>;
vfront-porch = <13>;
vsync-len = <3>;
clock-frequency = <30000000>;
hsync-active = <1>;
vsync-active = <1>;
};
};
};
I'm very confulsed about this problem, Would you mind providing a quick explanation for this?please tell me reason.
Thanks,
Chris
-
Hi Chris,
As you mentioned, the Rev1E displays use a new glass panel and switched from the ILI6122 IC to the ILI6137. We have not been able to find any timing or power requirement differences between the Rev1D and Rev1E displays. Could you please measure the input voltage at startup with an oscilloscope? I suspect the issue may be caused by fluctuations or instability of the power supply. The new LCD driver (ILI6137) may have slightly different power-up current demands compared to the ILI6122. If the power supply struggles to deliver enough current during the inrush phase, voltages may temporarily drop, causing flickering.
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