TECHNOLOGY FOR DRIVING A PANEL

• US 20180136778A1
• Filed: 06/02/2016
• Published: 05/17/2018
• Est. Priority Date: 06/04/2015
• Status: Abandoned Application

• Current Assignee: Silicon Works Co., Ltd.
• Original Assignee: Silicon Works Co., Ltd.
• Inventors: CHOI, JungMin, OH, HyungSeog, AHN, YongSung, KIM, JiHun
• Application Number:
  US15/579,189
• Publication Number:
  US 20180136778A1
• Time in Patent Office: Days
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04108 Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

Abstract

The present invention provides a display device that simultaneously conducts display updates and touch sensing in some regions. The display device according to one aspect of the present invention comprises: a plurality of sensor electrodes for sensing approaches or touches of an object; a plurality of display electrodes for forming a data voltage in each pixel in conjunction with the sensor electrodes; a sensor driving circuit for supplying a first sensor electrode with a sensor driving signal; and a data driving circuit for supplying a first display electrode with a data signal which changes in response to the sensor driving signal so that the voltage between the first sensor electrode and the first display electrode becomes a first data voltage.

Claims

1. A display device comprising:

a plurality of sensor electrodes configured to sense a proximity or a touch of an object;

a plurality of display electrodes configured to form a data voltage on each pixel through a link with the sensor electrodes;

a sensor-driving circuit configured to supply a sensor-driving signal to a first sensor electrode; and

a data-driving circuit configured to supply a data signal, which is changed in accordance with the sensor-driving signal such that a voltage between the first sensor electrode and a first display electrode becomes a first data voltage, to the first display electrode.

2. The display device of claim 1, wherein the sensor-driving signal and the data signal are changed with an identical phase.

3. A display device comprising:

a plurality of sensor electrodes configured to sense a proximity or a touch of an object;

a plurality of display electrodes configured to form a data voltage on each pixel through a link with the sensor electrodes;

a sensor-driving circuit configured to supply a sensor-driving signal to a first sensor electrode;

a data-driving circuit configured to supply a data signal to a first display electrode; and

a power circuit configured to supply a ground voltage to the data-driving circuit and change the ground voltage in accordance with the sensor-driving signal.

4. The display device of claim 3, wherein the sensor-driving circuit includes a sensor-driving voltage generator,

the data-driving circuit includes a data-driving voltage generator,

one side of the sensor-driving voltage generator is connected to a first ground voltage and a remaining side thereof outputs the sensor-driving signal,

one side of the data-driving voltage generator is connected to a second ground voltage and a remaining side thereof supplies the data signal, and

the power circuit supplies the second ground voltage to the data-driving circuit and changes the second ground voltage in accordance with the sensor-driving signal.

6. The display device of claim 4, wherein the sensor-driving signal and the second ground voltage are changed with an identical phase.

7. The display device of claim 3, wherein the data signal includes a transition interval, in which a voltage for a first pixel is changed into a voltage for a second pixel, and a stabilization interval, in which a data voltage of a particular pixel is maintained constant, and

The sensor-driving circuit modulates a waveform of the sensor-driving signal only in the stabilization interval.

8. The display device of claim 7, wherein, in the stabilization interval, the data-driving circuit maintains a voltage level of the data signal constant compared to the ground voltage.

9. The display device of claim 7, wherein the sensor-driving circuit senses the sensor electrode through a differential scheme.

5. The display device of claim wherein the power circuit includes a second ground voltage generator, and

one side of the second ground voltage generator is connected to the first ground voltage and a remaining side thereof outputs the second ground voltage.

10. An apparatus for driving a panel including a plurality of sensor electrodes and a plurality of display electrodes linked with the sensor electrodes, the apparatus comprising:

a power circuit configured to provide a first ground voltage, a second ground voltage, a first supply voltage linked with the first ground voltage, and a second supply voltage linked with the second ground voltage;

a sensor-driving circuit configured to supply a sensor-driving signal to the sensor electrodes;

a data-driving circuit configured to generate a data signal based on the second ground voltage and the second supply voltage and to supply the data signal to the display electrodes; and

a timing control circuit configured to generate a first timing signal based on the first ground voltage and the first supply voltage and supply the first timing signal to the data-driving circuit,

wherein the power circuit changes the second ground voltage in accordance with the sensor-driving signal, and

the data-driving circuit includes an interface circuit configured to convert the first timing signal linked with the first ground voltage into the second timing signal linked with the second ground voltage.

11. The apparatus of claim 10, wherein the interface circuit includes a data-timing block connected to the first ground voltage and a data-driving block connected to the second ground voltage, and

the first timing signal is supplied to the data-timing block and the second timing signal is generated by the data-driving block in accordance with the first timing signal.

12. The apparatus of claim 10, wherein the sensor-driving circuit receives the first ground voltage, receives a third timing signal linked with the first ground voltage from the timing control circuit, and generates the sensor-driving signal according to the third timing signal.

13. The apparatus of claim 10, wherein the sensor-driving circuit and the data-driving circuit are included in an integrated circuit, and

the integrated circuit includes two ground patterns, which are separated from each other, and a first ground pattern is connected to the first ground voltage and a second ground pattern is connected to the second ground voltage.

14. The apparatus of claim 10, wherein the timing control circuit transmits a third timing signal to the sensor-driving circuit and a fourth timing signal to the power circuit,

the sensor-driving circuit generates the sensor-driving signal according to the third timing signal, and

the power circuit changes the second ground voltage in accordance with the sensor-driving signal based on the fourth timing signal.

15. The apparatus of claim 10, wherein the power circuit generates a gate high voltage and a gate low voltage linked with the second ground voltage and supplies the generated gate high voltage and gate low voltage to a gate-driving circuit, and

the gate-driving circuit receives a fifth timing signal linked with the first ground voltage from the timing control circuit and converts the fourth timing signal into a signal at a level of the second ground voltage through the interface circuit.