Display substrate with central region with lower pixel density and preparation method thereof, and display apparatus

A display apparatus, comprising a display substrate, the display substrate comprising:

• a peripheral display region and a central display region;
• multiple first pixel units being regularly arranged within the peripheral display region, and multiple second pixel units being regularly arranged within the central display region;
• wherein:
• Pixels Per Inch of the first pixel units within the peripheral display region is greater than Pixels Per Inch of the second pixel units within the central display region;
• or
• Pixels Per Inch of the first pixel units within the peripheral display region is equal to Pixels Per Inch of the second pixel units within the central display region, and an area of the first pixel unit is larger than an area of the second pixel unit;
• the first pixel units within the peripheral display region are arranged in rectangularly shaped rings which are in an outward concentric arrangement around the central display region;
• the second pixel units within the central display region are arranged in rectangularly shaped rings which are in an outward concentric arrangement around a center of the display substrate, and an area of a second pixel unit in any rectangularly shaped ring is larger than an area of another second pixel unit in an inner rectangularly shaped ring adjacent to the any rectangularly shaped ring of the second pixel unit;
• an area of an innermost first pixel unit in the peripheral display region is larger than an area of an outermost second pixel unit in the central display region adjacent to the innermost first pixel unit;
• and
• that the Pixels Per Inch of the first pixel units within the peripheral display region is greater than the Pixels Per Inch of the second pixel units within the central display region, comprises:
• a distance between adjacent first pixel units within the peripheral display region is smaller than a distance between adjacent second pixel units within the central display region.

A preparation method of a display substrate, comprising:

• preparing multiple first pixel units regularly arranged in a peripheral display region, and preparing multiple second pixel units regularly arranged in a central display region;
• wherein:
• Pixels Per Inch of the first pixel units within the peripheral display region is greater than Pixels Per Inch of the second pixel units within the central display region;
• or
• Pixels Per Inch of the first pixel units within the peripheral display region is equal to Pixels Per Inch of the second pixel units within the central display region, and an area of the first pixel unit is larger than an area of the second pixel unit;
• the first pixel units within the peripheral display region are arranged in rectangularly shaped rings which are in an outward concentric arrangement around the central display region;
• the second pixel units within the central display region are arranged in rectangularly shaped rings which are in an outward concentric arrangement around a center of the display substrate, and an area of a second pixel unit in any rectangularly shaped ring is larger than an area of another second pixel unit in an inner rectangularly shaped ring adjacent to the any rectangularly shaped ring of the second pixel unit;
• an area of an innermost first pixel unit in the peripheral display region is larger than an area of an outermost second pixel unit in the central display region adjacent to the innermost first pixel unit;
• and
• that the Pixels Per Inch of the first pixel units within the peripheral display region is greater than the Pixels Per Inch of the second pixel units within the central display region, comprises:
• a distance between adjacent first pixel units within the peripheral display region is smaller than a distance between adjacent second pixel units within the central display region.