Integrated pixel display and touch sensor
In one embodiment, an apparatus includes a display component comprising a plurality of pixels configured to display an image. The apparatus also includes a touch sensor component configured to detect a touch input. The apparatus additionally includes a touch-screen controller. The touch-screen controller is coupled to the touch sensor component and the display component. The touch-screen controller is configured to generate a drive signal for the touch sensor component using a portion of the display component.
1. An apparatus, comprising:
one or more display layers within a liquid crystal display (LCD) display stack;
a plurality of sense electrodes within the LCD display stack, the plurality of sense electrodes configured to detect a touch input;
a reference voltage layer within the LCD display stack, the reference voltage layer comprising a plurality of electrically isolated drive lines and configured to provide a reference voltage for the one or more display layers and a drive signal detectable by the plurality of sense electrodes; and
the plurality of electrically isolated drive lines configured to be pulsed simultaneously to provide the reference voltage for the one or more display layers and each be pulsed one at a time to provide drive signals to the plurality of sense electrodes.
2. The apparatus of claim 1 , wherein two or more of the plurality of electrically isolated drive lines are configured to all be pulsed simultaneously to provide drive signals to the plurality of sense electrodes.
3. The apparatus of claim 1 , wherein the plurality of electrically isolated drive lines of the reference voltage layer comprise fine lines of metal.
4. The apparatus of claim 1 , wherein the plurality of sense electrodes are disposed on a first surface.
5. The apparatus of claim 4 , wherein the reference voltage layer is disposed on a second surface within the display stack.
6. The apparatus of claim 1 , further comprising a touch screen controller coupled to the plurality of sense electrodes and to the reference voltage layer, the touch screen controller configured to control the reference voltage for the one or more display layers and the drive voltage for the plurality of drive electrodes.
7. An apparatus, comprising:
a display component comprising a plurality of pixels configured to display an image;
a touch sensor component comprising a plurality of drive electrodes and a plurality of sense electrodes, the touch sensor component configured to detect a touch input;
a touch-screen controller coupled to the touch sensor component and the display component, the touch-screen controller configured to pulse the drive electrodes simultaneously to provide a reference voltage for the display component and pulse the drive electrodes one at a time to provide drive signals to the plurality of sense electrodes.
8. The apparatus of claim 7 , wherein the display component comprises an organic light emitting diode.
9. The apparatus of claim 7 , wherein the display component comprises one or more display layers of a liquid crystal display.
10. The apparatus of claim 7 , wherein the touch-screen controller is coupled to a reference voltage layer, the reference voltage layer configured to provide a reference voltage for the display component and a sense signal to the touch-screen controller.
11. The apparatus of claim 7 , wherein the touch-screen controller is configured to generate a drive signal for the touch sensor component using the drive electrodes.
12. The apparatus of claim 7 , wherein the touch-screen controller is coupled to a pixel-drive layer, the pixel-drive layer configured to provide a pixel-drive signal for the display component and a drive signal for the touch sensor component.