First of all, try to place your TV at a place where it does not face any direct sunlight. If it is not possible, change the angle, making sure that the television is not facing the window directly. Try to minimise the amount of direct sunlight in your room by trying blinders or curtains.
If you are using light-coloured blinders, quickly replace them with the darker ones. It is a good idea to keep the window closed during the day time, so the sun does not enter the room.
Don’t place lamps or other lighting sources near the television. The idea is to keep as less light as possible light in front of the screen. You can fix your lamps right on the top of the screen or at the back. If you must use light right in front of the display, try to keep it at a certain angles.
Another simple trick is placing the TV set inside a rack or an entertainment cabin. The walls and shelves of the cabin should be slightly bigger than the size of your TV, so no light hits the screen directly. It is however not one of the highly recommended steps, because your screen may look really awkward inside the cabin.
Visit the electronics market, and look for the glare guard or cover for your TV set. You can also contact the manufacturer, and ask whether they have prepared any special glare guard for your particular TV model. These glare guards are made of transparent plastic, and fit right over the screen.