AnandTech appears to have obtained information from the company's display arm indicating that the device's screen will include an RGB subpixel arrangement and energy-saving capabilities.
The report states that the displays will be shipped to manufacturers during the current quarter, hinting at a Q4 release for the Galaxy S3 successor.
Samsung's new OLED screen tech will reportedly offer a 25% power saving compared to the company's previous smartphone offerings.
The tech giant has also showcased a prototype phone with a curved lip on the edge of the screen to display additional information even when the device is switched off. It is yet to be confirmed whether this form factor will be used for the S4.
Previous rumours suggested that the Galaxy S4 will feature a powerful quad-core processor and 13-megapixel camera. The device is said to have been revealed in a press photograph earlier this month, but the authenticity of the image has not been verified.
Samsung today confirmed that its Galaxy S range has topped 100 million sales in less than three years.