Top emission flat panel display with sensor feedback stabilization
The present invention discloses novel top emitter pixel circuitry for flat panel displays. Sensor material is deposited above a substrate. A pixilated opaque cathode is deposited above the sensor material. Organic light emitting diode material is deposited above the cathode. A transparent anode is deposited above the OLED material. Some of the layers have dielectric layers between them. The light emitted by the OLED material passes upwards through the transparent anode but cannot pass downwards through the opaque cathode. A deep via optically connects the OLED material layer with the sensor material layer. A transparent cathode can be used instead of the opaque cathode, thereby allowing the light generated by the OLED material layer to pass both upward through the transparent anode and downward through the transparent cathode. That would eliminate the need for a deep via to form an optical path between the OLED material layer and the sensor layer. However, that would require the addition of a shield to shield the active matrix circuitry from the light generated by the OLED material layer.
1 . A semiconductor circuit for an emissive pixel comprising:
a substrate;
a sensor material layer above the substrate;
an opaque cathode material layer above the sensor material layer;
a light emission material layer above the opaque cathode material layer;
a transparent anode material layer above the light emission material layer; and
a transparent deep via for optically connecting the light emission material layer with the sensor emission material layer; wherein,
the light emitted by the light emission material layer passes through the transparent anode material layer; and
the light emitted by the light emission material does not pass through the opaque cathode material layer.
2 . The semiconductor circuit of claim 1 , wherein the light emission material of the light emission material layer includes an organic light emitting diode material.
3 . The semiconductor circuit of claim 1 , wherein the sensor material of the sensor material layer includes an organic light emitting diode material.
4 . The semiconductor circuit of claim 3 , wherein an organic light emitting diode of the sensor material layer is reverse biased during operation.
5 . The semiconductor circuit of claim 1 , further comprising:
a transparent dielectric material layer between the transparent deep via and the sensor material layer.
6 . A semiconductor circuit for an emissive pixel comprising:
a substrate;
a sensor material layer above the substrate;
a transparent cathode material layer above the sensor material layer;
a light emission material layer above the transparent cathode material layer; and
a transparent anode material layer above the light emission material layer; wherein,
the light emitted by the light emission material layer passes through the transparent anode material layer and the transparent cathode material layer.
7 . The semiconductor circuit of claim 6 , wherein light emission material of the light emission material layer includes an organic light emitting diode material.
8 . The semiconductor circuit of claim 6 , further comprising:
a thin film transistor material layer adjacent to the sensor material layer;
a metal layer above the thin film transistor material layer;
the transparent cathode material layer above the metal layer;
the light emission material layer above the transparent cathode material layer; and
the transparent anode material layer above the light emission material layer; wherein,
the metal layer for providing a gate for a thin film transistor of the thin film transistor layer; and
the metal layer for shielding the sensor material layer from the light emitted by the light emission material layer.
9 . The semiconductor circuit of claim 6 , wherein the sensor material of the sensor material layer includes an organic light emitting diode material.
10 . The semiconductor circuit of claim 9 , wherein an organic light emitting diode of the sensor material layer is reverse biased during operation.
11 . A semiconductor circuit for an emissive pixel comprising:
a substrate;
a first metal layer adjacent to a second metal layer, the first and the second metal layer above the substrate;
a thin film transistor material layer adjacent to a sensor material layer, the thin film transistor material layer above the first metal layer and the sensor material layer above the second metal layer;
a shield material layer above the thin film transistor material layer and the sensor material layer;
a transparent cathode material layer above the shield material layer;
a light emission material layer above the transparent cathode material layer; and
a transparent anode material layer above the light emission material layer; wherein
the shield material layer includes a cavity above the sensor material layer;
the shield material layer shields the thin film transistor material layer from the light emitted by the light emission material layer; and
the cavity in the shield material layer optically connects the light emission material layer with the sensor material layer.
12 . The semiconductor circuit of claim 11 , wherein the light emitted by the light emission material layer passes through the transparent anode material layer and the transparent cathode material layer.
13 . The semiconductor circuit of claim 11 , wherein the light emission material of the light emission material layer includes an organic light emitting diode material.
14 . The semiconductor circuit of claim 11 , wherein the first metal layer for providing a gate for a thin film transistor of the thin film transistor material layer.
15 . The semiconductor circuit of claim 11 , wherein the second metal layer for controlling the conductivity of the sensor material layer.
16 . The semiconductor circuit of claim 11 , wherein the sensor material of the sensor material layer includes an organic light emitting diode material.
17 . The semiconductor circuit of claim 16 , wherein an organic light emitting diode of the sensor material layer is reverse biased during operation.
18 . A semiconductor circuit for an emissive pixel comprising:
a substrate;
a sensor material layer above the substrate;
an opaque cathode material layer above the sensor material layer;
a light emission material layer above the sensor material layer; and
a transparent anode material layer above the light emission material layer; wherein
the opaque cathode material layer including a cavity for forming an optical path between the light emission material layer and the sensor material layer.
19 . The semiconductor circuit of claim 18 , wherein the light emission material of the light emission material layer includes an organic light emitting diode material.
20 . The semiconductor circuit of claim 18 , further comprising:
a metal layer between the sensor material layer and the opaque cathode material layer for controlling the conductivity of the sensor material layer.
21 . The semiconductor circuit of claim 18 , wherein the sensor material of the sensor material layer includes an organic light emitting diode material.
22 . The semiconductor circuit of claim 21 , wherein an organic light emitting diode of the sensor material layer is reverse biased during operation.