Abstract: An improvement in an all solid type electrochromic display element comprising a first electrode, a first oxidation-reduction reaction film layer, an insulating film layer, a second oxidation-reduction reaction film layer and a second electrode laminated in this order. The improvement is characterized in that only one of the first and second oxidation-reduction film layers is patterned.

Abstract: This specification discloses an indicator device within the viewfinder of a camera for indicating a predetermined range substantially centrally of the viewfinder field frame. The indicator device comprises at least one electro-optical element for indicating the predetermined range, the optical characteristic of the electro-optical element being variable by an electrical signal information, an information circuit for putting out photographing information, and a control circuit for producing an electrical signal information corresponding to the output of the information circuit and varying the optical characteristic of the electro-optical element.

Abstract: The all solid-state ECD of the present invention features a structure composed of an oxidizable film capable of a redox reaction and showing a change in the transmittance in a certain wavelength range in the oxidized state, a reducible film capable of a redox reaction and showing a change in the transmittance in a certain wavelength range in the reduced state, an insulating film provided between said films and allowing proton conduction but prohibiting electron conduction, and a pair of electrodes between which said three films are maintained, wherein said oxidizable film is substantially composed of iridium hydroxide and/or nickel hydroxide, while said reducible film is substantially composed of tungsten oxide and/or molybdenum oxide.The ECD shows several faster response speeds, a significantly reduced voltage and the change in the transmittance improved more than six times with a drive voltage reduced to 1/8.