Automation HAT and 7" DSI LCD

Dear All,
I have a Raspberry Pi 4 and a Waweshare 7" DSI LCD.
If know good, this LCD use the I2C for a communication.
How I can connect the LCD and the Automation HAT at the same time?
If I connect only the power to the display, the display not working. If connect I2C also, the display working fine.

Anyone has an idea?
Thans for a help.

i2c can have multiple devices connected, as long as no two have the same address.

Yes, now it works. Automation HAT not has a connection to extend I2C bus… So I used a demo hat between Raspberry and Automation HAT. Anybody has a better easy idea how I can connect the display to I2C bus when use Automation HAT?