Penlight and touch screen data input system and method for flat panel displays
First Claim
1. An emissive pixel device having an integrated luminance and input sensor, the pixel device comprising:
- a light emitting device;
a pixel emitter drive circuit generating a current to drive the light emitting device to a predetermined luminance corresponding to an image voltage and applying the drive current to the light emitting device during a frame time;
at least one photo sensor that exhibits a change in electrical characteristic in response to a change in incident photon flux disposed near the light emitting device to;
(i) intercept a measurable photon flux when the light emitting device is in an emitting state, and (ii) to detect a measurable photon flux from a source outside the pixel when the light emitting device is not in an emitting state;
at least one of a voltage, current, and charge reading circuit for measuring;
(i) a first voltage across, a first current from, or a first charge generated by the photo sensor device at the end of a first portion of a non-emitting time period during a non-light emitting state, and wherein the measured first voltage, first current, or first charge being an indication of a measured luminance emitted from a source outside the pixel during the first portion of the time period; and
(ii) a second voltage across, a second current from, or a second charge generated by the photo sensor device at the end of a second portion of an emitting time period during the light emitting state, and wherein the measured second voltage, second current, or second charge being an indication of a measured luminance emitted from the pixel during a second portion of the time period.
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Accused Products
Abstract
System, device, and method for receiving or sensing touch or light input to an emissive display such as to a OLED display using the same or different sensors as are used to sense and maintain a pixel luminance. Penlight and touch screen data input system and method for display. A sidelight illuminated display and touch panel input device. Method and device for reading display pixel emission and ambient luminance levels. Emissive display having sensing for luminance stabilization and user light or touch screen input. Method and device for emissive display using shielded or partially shielded sensors. Emissive pixel display device characterized in that photon sensors are disposed within pixels and operated to sense photons emitted by emitter within pixel and ambient photons emitted by sources outside pixel, sensed internally emitted photons being for luminance feedback control and sensed ambient photons being used to detect external light source or sources.
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Citations
29 Claims
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1. An emissive pixel device having an integrated luminance and input sensor, the pixel device comprising:
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a light emitting device;
a pixel emitter drive circuit generating a current to drive the light emitting device to a predetermined luminance corresponding to an image voltage and applying the drive current to the light emitting device during a frame time;
at least one photo sensor that exhibits a change in electrical characteristic in response to a change in incident photon flux disposed near the light emitting device to;
(i) intercept a measurable photon flux when the light emitting device is in an emitting state, and (ii) to detect a measurable photon flux from a source outside the pixel when the light emitting device is not in an emitting state;
at least one of a voltage, current, and charge reading circuit for measuring;
(i) a first voltage across, a first current from, or a first charge generated by the photo sensor device at the end of a first portion of a non-emitting time period during a non-light emitting state, and wherein the measured first voltage, first current, or first charge being an indication of a measured luminance emitted from a source outside the pixel during the first portion of the time period; and
(ii) a second voltage across, a second current from, or a second charge generated by the photo sensor device at the end of a second portion of an emitting time period during the light emitting state, and wherein the measured second voltage, second current, or second charge being an indication of a measured luminance emitted from the pixel during a second portion of the time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of operating an emissive pixel device having an integrated luminance and input sensor, the method comprising:
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generating a current to drive a light emitting device to a predetermined luminance corresponding to an image voltage and applying the drive current to the light emitting device during a frame time;
coupling at least one charge storage device with the sensor for accumulating or releasing charges and exhibiting a capacitance charge and voltage proportional to the charge at a time;
exposing the sensor that exhibits a change in electrical characteristic in response to a change in incident photon flux to photons emitted by the light emitting device during the a first time period and a second time period;
accumulating (charge) or draining (discharge) charges to or from the at least one charge storage device coupled with the sensor, the sensor including a component that controls the rate of accumulation or release of charges during the first and second time periods;
measuring a voltage or current arising from the charges present on the charge storage device at the end of a portion of the first and second time periods, the measured voltage or current during the portion of the first period being an indication of an actual luminance emitted from the pixel during the portion of the first time period, and the measured voltage or current during the portion of the second period being an indication of an actual luminance incident upon the pixel sensor from an external source during the portion of the second time period;
comparing the actual luminance emitted from the pixel related measured voltage or current with a reference target pixel luminance for the pixel emitter image voltage and pixel emitter drive current to generate a difference value;
applying the difference value as a feedback input to a correction circuit that modifies the image voltage and drive current for the same pixel during a subsequent frame time; and
comparing the actual luminance incident upon the pixel sensor during the portion of the second time period with actual luminance for at least one other pixels in the display to identify a touched or light pen input location on the display.
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19. A method for detecting an input to a display device having a first plurality of separately addressable picture element (pixel) locations arranged as a two-dimensional array, the method comprising:
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providing a photon sensing element proximate at least some of the first plurality of separately addressable pixel locations in the two-dimensions of the array;
detecting photons impinging on each of the sensing elements during predetermined detection time periods;
generating a sensed signal for each of the photon sensing elements corresponding to the number or energy of the detected photons; and
analyzing the sensed signals to identify at least one pixel location that has received an input. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of operating an emissive pixel device having an integrated luminance and input sensor, the method comprising:
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generating a current to drive a light emitting device in each pixel to a predetermined luminance corresponding to an image voltage and applying the drive current to the light emitting device during a frame time;
providing at least one photo sensor that exhibits a change in electrical characteristic in response to a change in incident photon flux near the light emitting device in each pixel to;
(i) intercept a measurable photon flux when the light emitting device is in an emitting state, and (ii) to detect a measurable photon flux from a source outside the pixel when the light emitting device is not in an emitting state;
reading at least one of a voltage, current, and charge measurement representing;
(i) a first voltage across, a first current from, or a first charge generated by the photo sensor device at the end of a first portion of a non-emitting time period during a non-light emitting state, and wherein the measured first voltage, first current, or first charge being an indication of a measured luminance emitted from a source outside the pixel during the first portion of the time period; and
(ii) a second voltage across, a second current from, or a second charge generated by the photo sensor device at the end of a second portion of an emitting time period during the light emitting state, and wherein the measured second voltage, second current, or second charge being an indication of a measured luminance emitted from the pixel during a second portion of the time period.
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Specification