Black & White patches

Recently i found some patch of black and white dots on the screen. It becomes more worse on these days. Pls help me to solve the issue.

Hi Chowans,
Welcome to the HP Support Forums! 
I understand that you are getting black and white dots forming a patch on your display screen. I will try my best to help you with this. To better guide you, could you please tell me the model or product number of your computer and the operating system that is running on it. Here are some guides for How Do I Find My Model Number or Product Number? and Which Windows operating system am I running?.
Please let me know and I will be happy to help you.
Thank you and have a nice day!
I worked on behalf of HP.

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