Integrated pixel display and touch sensor
In one embodiment, an apparatus includes one or more display layers within a display stack, the one or more display layers include a plurality of crystals configured to adjust a polarization of light passing through the one or more display layers. The apparatus includes a reference voltage layer that provides the one or more display layers with a reference voltage. The apparatus includes a plurality of pixel-drive electrodes that adjust the polarization of the light passing through the one or more display layers by adjusting an electrical potential between the plurality of pixel-drive electrodes and the reference voltage layer. The pixel-drive electrodes provide drive signals for a touch sensor and the reference voltage layer provides sense signals.
1. An apparatus, comprising:
one or more display layers within a display stack, the one or more display layers comprising a plurality of pixels configured to display an image;
a reference voltage layer configured to provide the one or more display layers with a reference voltage; and
a plurality of pixel-drive electrodes configured to adjust the polarization of the light passing through the one or more display layers by adjusting an electrical potential between the plurality of pixel-drive electrodes and the reference voltage layer, the plurality of pixel-drive electrodes arranged in a plurality of rows of pixel-drive electrodes, each row of pixel-drive electrodes comprising multiple pixel-drive electrodes coupled together;
wherein:
the plurality of pixel-drive electrodes are further configured to provide a plurality of drive signals for a touch sensor;
the reference voltage layer is further configured to provide sense signals, the reference voltage layer comprising a plurality of electrodes configured to provide the sense signals for the touch sensor;
the one or more display layers are between the reference voltage layer and the plurality of pixel-drive electrodes; and
the plurality of pixel-drive electrodes are arranged in a plurality of subsets, each subset comprising multiple rows of the plurality of rows of pixel-drive electrodes that collectively provide a drive signal for the touch sensor, a particular electrode of the plurality of electrodes of the reference voltage layer spanning multiple subsets of the plurality of subsets of pixel-drive electrodes and spanning two or more pixel-drive electrodes in each row of pixel-drive electrodes of the multiple subsets of the plurality of subsets of pixel-drive electrodes.
2. The apparatus of claim 1 , wherein the reference voltage layer comprises fine lines of metal.
3. The apparatus of claim 1 , wherein the plurality of pixel-drive electrodes comprises a two-dimensional array of pixel-drive electrodes.
4. The apparatus of claim 1 , further comprising a touch screen controller coupled to the reference voltage layer and the plurality of pixel-drive electrodes, the touch screen controller configured to adjust the electrical potential at each of the plurality of pixel-drive electrodes to generate an image and to generate a drive signal used to determine a location of a touch input based on the sense signals from the reference voltage layer.
5. The apparatus of claim 1 , further comprising a touch screen controller coupled to the reference voltage layer and the plurality of pixel-drive electrodes, the touch screen controller configured to adjust the electrical potential at each of the plurality of pixel-drive electrodes to generate an image.
6. The apparatus of claim 1 , wherein the plurality of pixel-drive electrodes arranged in the plurality of subsets are individually controlled to generate an image.
7. The apparatus of claim 1 , wherein the display stack is a liquid crystal display (LCD) stack.
8. The apparatus of claim 1 , wherein the display stack is an organic light emitting diode (OLED) display stack.
9. The apparatus of claim 1 , wherein the pixel-drive electrodes comprise a plurality of electrically isolated drive lines that are configured to each be pulsed one at a time to provide drive signals to the touch sensor.
10. The apparatus of claim 1 , wherein the pixel-drive electrodes comprise a plurality of electrically isolated drive lines, wherein two or more of the plurality of electrically isolated drive lines are configured to be pulsed simultaneously to provide drive signals to the plurality of sense electrodes.
11. An apparatus, comprising:
one or more display layers within a display stack, the one or more display layers comprising a plurality of pixels configured to display an image;
a touch sensor comprising a plurality of sense electrodes and a plurality of drive electrodes, the touch sensor configured to detect a touch input;
a reference voltage layer comprising a plurality of electrically isolated drive lines configured to:
provide a reference voltage for the one or more display layers; and
provide sense signals from the plurality of sense electrodes; and
a plurality of pixel-drive electrodes comprising fine lines of metal arranged in a mesh configuration, the plurality of pixel-drive electrodes arranged in a plurality of rows of pixel-drive electrodes, each row of pixel-drive electrodes comprising multiple pixel-drive electrodes coupled together, the plurality of pixel-drive electrodes configured to:
adjust the polarization of the light passing through the one or more display layers by adjusting an electrical potential between the plurality of pixel-drive electrodes and the reference voltage layer; and
provide a plurality of drive signals for the drive electrodes;
wherein:
the one or more display layers are between the reference voltage layer and the plurality of pixel-drive electrodes; and
the plurality of pixel-drive electrodes are arranged in a plurality of subsets, each subset comprising multiple rows of the plurality of rows of pixel-drive electrodes that collectively provide a drive signal for the touch sensor, a particular drive line of the plurality of electrically isolated drive lines of the reference voltage layer spanning multiple subsets of the plurality of subsets of pixel-drive electrodes and spanning two or more pixel-drive electrodes in each row of pixel-drive electrodes of the multiple subsets of the plurality of subsets of pixel-drive electrodes.
12. The apparatus of claim 11 , wherein the plurality of pixel-drive electrodes are configured to adjust the polarization of light passing through the one or more display layers by pulsing the pixel-drive electrodes individually to generate a pixel-drive signal and the pixel-drive electrodes are pulsed simultaneously to provide drive signals for the touch sensor.
13. The apparatus of claim 11 , wherein the plurality of pixel-drive electrodes are configured to adjust the polarization of light passing through the one or more display layers by pulsing the pixel-drive electrodes simultaneously to generate a pixel-drive signal and the pixel-drive electrodes are pulsed individually to provide drive signals for the touch sensor.
14. The apparatus of claim 11 , wherein the drive electrodes are oriented perpendicularly to the orientation of the sense electrodes.