Foldable electronic display device having high-density OLED array with transparent region

An electronic display device, comprising:

• a layered monolithic sheet-form structure having a generally rectangular shape with rounded corners, a thickness of less than 1.5 mm, and a smooth outer surface, the layered monolithic sheet-form structure comprising:
• a first layer formed by a flexible sheet of an optically transparent material having a substantially uniform thickness and a Young's modulus of at least 1 GPa;
• a second layer formed by a flexible sheet of an optically transparent or translucent material having a substantially uniform thickness, the second layer being approximately coextensive in size with the first layer;
• a third layer being approximately coextensive in size with the first and second layers and comprising one or more sheets of an opaque heat-conductive material;
• a light emitting region having a generally rectangular area and comprising a plurality of solid-state light emitting devices arranged in a two-dimensional pixel array, the two-dimensional pixel array having a longer dimension from 10 centimeters to 30 centimeters and a pixel density of at least 300 pixels per inch, wherein the two-dimensional pixel array comprises at least one million individually digitally addressable organic light emitting diodes (OLEDs) and has an area that is greater than 90% of a total area of the first layer;
• a first adhesive layer disposed on a front side of the two-dimensional pixel array;
• a second adhesive layer disposed on a back side of the two-dimensional pixel array;
• a first fold area longitudinally extending along a major dimension of the layered monolithic sheet-form structure;
• and
• at least one transparent area,
• wherein the layered monolithic sheet-form structure hermetically encapsulates the two-dimensional pixel array,
• wherein each of the OLEDs has a size from 1 micrometer to 300 micrometers,
• wherein each individual pixel in the two-dimensional pixel array comprises at least one OLED configured to emit light in red color, at least one OLED configured to emit light in green color, and at least one OLED configured to emit light in blue color, and
• wherein the layered monolithic sheet-form structure is configured for repetitive and reversible folding upon itself with a radius of curvature from 1 mm to 5 mm in the first fold area.