This looks to me as though your assessment is most likely correct (regarding the “too thick” battery) but it would help to know what orientation the iPad was in while this photo was taken for more detail. Which direction is the home button?
That being said. This looks like wrinkles in the backlight sheets in the display panel. Yes, probably caused by upward pressure on the display because of a poorly positioned, substandard or swollen battery. Usually this manifests as a spot where colors are more or less saturated, or generally different than other points on the screen.
Modern displays are pale of many layers, including one that assists in evenly dispersing light. Some of these older iPads have more distance between layers. Imagine somebody pushing upwards on a sheet of paper, laid flat—it might wrinkle in a similar way. Backlights are usually consistent of a strip of high powered LEDs along the edge of the display, pointing parallel to the surface of the screen. If the sheet intended to evenly reflect this light is not totally flat, it will generate shadows like this.
This looks to me as though your assessment is most likely correct (regarding the “too thick” battery) but it would help to know what orientation the iPad was in while this photo was taken for more detail. Which direction is the home button?
That being said. This looks like wrinkles in the backlight sheets in the display panel. Yes, probably caused by upward pressure on the display because of a poorly positioned, substandard or swollen battery. Usually this manifests as a spot where colors are more or less saturated, or generally different than other points on the screen.
Modern displays are pale of many layers, including one that assists in evenly dispersing light. Some of these older iPads have more distance between layers. Imagine somebody pushing upwards on a sheet of paper, laid flat—it might wrinkle in a similar way. Backlights are usually consistent of a strip of high powered LEDs along the edge of the display, pointing parallel to the surface of the screen. If the sheet intended to evenly reflect this light is not totally flat, it will generate shadows like this.