An electronic system comprising an electronic device that has a first sensor and a display area, the display area corresponding to the entire display or a portion of said entire display, the electronic system further comprising an accessory that comprises: a cover portion suitable for covering the display area of the electronic device, wherein the cover portion comprises a first element that may be sensed by the first sensor when the cover portion covers the display area and the cover portion comprising: a transparent layer, a first layer disposed on one side of the transparent layer and having a plurality of first apertures; and a second layer disposed on the other side of the transparent layer and having a plurality of second apertures, wherein each of the plurality of first apertures of the first layer corresponds to one of the plurality of second apertures of the second layer, wherein a first plurality of the first and second apertures (605, 606) with the transparent layer form a plurality of light-transmitting areas, wherein the plurality of light-transmitting areas are arranged in an array, and configured for light of an image generated by the display area to be projected out and through the light-transmitting areas to form a dotted character, a dotted symbol, or a dotted pattern; wherein the electronic device further has a second sensor for detecting a presence of nearby objects, and the cover portion has an opening for the second sensor to detect the presence of nearby objects via the opening of the cover portion wherein the opening is formed by an aperture of the transparent layer together with two of a second plurality of the first and second apertures (605, 606), wherein the apertures in the second plurality are different from the apertures in the first plurality and said apertures forming the opening are located in different layers. a cover portion suitable for covering the display area of the electronic device, wherein the cover portion comprises a first element that may be sensed by the first sensor when the cover portion covers the display area and the cover portion comprising: a transparent layer, a first layer disposed on one side of the transparent layer and having a plurality of first apertures; and a second layer disposed on the other side of the transparent layer and having a plurality of second apertures, wherein each of the plurality of first apertures of the first layer corresponds to one of the plurality of second apertures of the second layer, wherein a first plurality of the first and second apertures (605, 606) with the transparent layer form a plurality of light-transmitting areas, wherein the plurality of light-transmitting areas are arranged in an array, and configured for light of an image generated by the display area to be projected out and through the light-transmitting areas to form a dotted character, a dotted symbol, or a dotted pattern; a transparent layer, a first layer disposed on one side of the transparent layer and having a plurality of first apertures; and a second layer disposed on the other side of the transparent layer and having a plurality of second apertures, wherein each of the plurality of first apertures of the first layer corresponds to one of the plurality of second apertures of the second layer, wherein a first plurality of the first and second apertures (605, 606) with the transparent layer form a plurality of light-transmitting areas, wherein the plurality of light-transmitting areas are arranged in an array, and configured for light of an image generated by the display area to be projected out and through the light-transmitting areas to form a dotted character, a dotted symbol, or a dotted pattern; wherein the electronic device further has a second sensor for detecting a presence of nearby objects, and the cover portion has an opening for the second sensor to detect the presence of nearby objects via the opening of the cover portion wherein the opening is formed by an aperture of the transparent layer together with two of a second plurality of the first and second apertures (605, 606), wherein the apertures in the second plurality are different from the apertures in the first plurality and said apertures forming the opening are located in different layers.