Display device, display module, electronic device, and method for manufacturing display device

A display device comprising:

• a first display element;
• a second display element;
• a first insulating layer;
• a second insulating layer;
• a first transistor;
• and
• a second transistor,
• wherein the first transistor is configured to control driving of the first display element,
• wherein the second transistor is configured to control driving of the second display element,
• wherein the first display element comprises a first pixel electrode configured to reflect visible light and a liquid crystal layer,
• wherein the second display element is configured to emit visible light,
• wherein the second display element comprises a second pixel electrode and a common electrode,
• wherein the first transistor and the second transistor are between the first insulating layer and the second insulating layer,
• wherein the first transistor is electrically connected to the first pixel electrode through an opening in the first insulating layer,
• wherein the second transistor is electrically connected to the second pixel electrode through an opening in the second insulating layer,
• wherein the liquid crystal layer is on an opposite side of the first pixel electrode from the first insulating layer,
• wherein the common electrode is on an opposite side of the second pixel electrode from the second insulating layer,
• wherein the liquid crystal layer comprises a first region overlapping with the first pixel electrode and a second region overlapping with the second display element, and
• wherein a thickness of the liquid crystal layer in the first region is smaller than a thickness of the liquid crystal layer in the second region.

A method for manufacturing a display device comprising:

• forming a first common electrode over a first substrate;
• forming a separation layer configured to reflect visible light over a formation substrate;
• forming an insulating layer over the separation layer;
• forming a second display element comprising a second pixel electrode configured to transmit visible light, a light-emitting layer, and a second common electrode configured to reflect visible light over the insulating layer;
• bonding the formation substrate and a second substrate to each other with the second display element interposed between the formation substrate and the second substrate;
• separating the formation substrate and the separation layer from each other;
• forming a first pixel electrode by processing the separation layer after the step of separating;
• and
• bonding the first substrate and the second substrate to each other with an adhesive with a liquid crystal layer interposed between the first common electrode and the first pixel electrode,
• wherein a first display element comprises the first pixel electrode configured to reflect visible light, the liquid crystal layer, and the first common electrode configured to transmit visible light.

A method for manufacturing a display device comprising:

• forming a first common electrode over a first substrate;
• forming a separation layer over a formation substrate;
• forming a first pixel electrode over the separation layer;
• forming an insulating layer over the first pixel electrode;
• forming a second display element comprising a second pixel electrode configured to transmit visible light, a light-emitting layer, and a second common electrode configured to reflect visible light over the insulating layer;
• bonding the formation substrate and a second substrate to each other with the second display element interposed between the formation substrate and the second substrate;
• separating the formation substrate and the separation layer from each other;
• removing the separation layer to expose the first pixel electrode after the step of separating;
• and
• bonding the first substrate and the second substrate to each other with an adhesive with a liquid crystal layer interposed between the first common electrode and the first pixel electrode,
• wherein a first display element comprises the first pixel electrode configured to reflect visible light, the liquid crystal layer, and the first common electrode configured to transmit visible light.