INFORMATION INPUT DEVICE AND DISPLAY DEVICE

• US 20100328268A1
• Filed: 06/08/2010
• Published: 12/30/2010
• Est. Priority Date: 06/29/2009
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Takeuchi, Takeya, Teranishi, Yasuyuki, Nakanishi, Takayuki, Ishizaki, Koji, Noguchi, Kouji
• Granted Patent: US 9,013,415 B2
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

An information input device includes a touch panel which is provided with a touch sensor capable of sensing a position in which a sensing target body is close to a sensing surface thereof. The touch sensor includes a scanning electrode and a detection electrode which faces and is spaced from the scanning electrode with a dielectric body being interposed therebetween, the touch sensor being configured so that electrostatic capacitance which is formed between the scanning electrode and the detection electrode is varied when the sensing target body is close to the detection electrode. The detection electrode is formed with a slit in a surface thereof which faces the scanning electrode, and a floating electrode is installed in the slit.

Claims

1. An information input device comprising a touch panel which is provided with a touch sensor capable of sensing a position in which a sensing target body is close to a sensing surface thereof,

wherein the touch sensor includes a scanning electrode and a detection electrode which faces and is spaced from the scanning electrode with a dielectric body being interposed therebetween, the touch sensor being configured so that electrostatic capacitance which is formed between the scanning electrode and the detection electrode is varied when the sensing target body is close to the detection electrode, and

wherein the detection electrode is formed with a slit in a surface thereof which faces the scanning electrode, and a floating electrode is installed in the slit.

2. The information input device according to claim 1, wherein the detection electrode and the floating electrode are transparent electrodes which transmit visible light.

3. The information input device according to claim 2, wherein the scanning electrode extends in a first direction in a surface direction of the sensing surface, the plurality of scanning electrodes being aligned to be spaced from each other in a second direction perpendicular to the first direction, and

wherein the detection electrode extends in the second direction, the plurality of detection electrodes being aligned to be spaced from each other in the first direction.

4. The information input device according to claim 3, wherein a plurality of slits is provided.

5. The information input device according to claim 4, wherein the detection electrode is installed so that the plurality of slits is respectively aligned in the first direction and the second direction, and

wherein the plurality of floating electrodes is aligned in the first direction and the second direction to correspond to the plurality of slits, respectively.

6. The information input device according to claim 5, wherein the plurality of detection electrodes includes protrusion sections which are protruded in the first direction in a side edge which extends in the second direction, and

wherein the plurality of protrusion sections is spaced from each other in the second direction.

7. The information input device according to claim 6, wherein the plurality of protrusion sections which is aligned in the second direction is formed so that end parts of the plurality of protrusion sections in the first direction are positioned in a random way.

8. The information input device according to claim 1, wherein the detection electrode is formed with a slit of a circular shape.

9. The information input device according to claim 3, further comprising a controller which selects a specific scanning electrode among the plurality of scanning electrodes and repeatedly performs a touch sensor driving operation for supplying a driving signal to the selected scanning electrode to drive the touch sensor,

wherein the controller selects, when performing the touch sensor driving operation, the plurality (m items) of the scanning electrodes which is continuously aligned in the second direction among the plurality (n items, 2<

m<

n) of scanning electrodes, as a scanning electrode group, and shifts the scanning electrode group in the second direction for the selection so that the different scanning electrode and the common scanning electrode are included between the continuous touch sensor driving operations.

10. A display device comprising a display panel which is provided with a touch sensor capable of sensing a position, where a sensing target body is close, in a display surface on which an image is displayed,

wherein the touch sensor includes a scanning electrode and a detection electrode which faces and is spaced from the scanning electrode with a dielectric body being interposed therebetween, the touch sensor being configured so that electrostatic capacitance which is formed between the scanning electrode and the detection electrode is varied when the sensing target body is close to the detection electrode, and

wherein the detection electrode is formed with a slit in a surface thereof which faces the scanning electrode, and a floating electrode is installed in the slit.

11. The display device according to claim 10, wherein the display panel is a liquid crystal display panel, the liquid crystal display panel including:

a first substrate;

a second substrate which faces and is spaced from the first substrate; and

a liquid crystal layer which is disposed between the first substrate and the second substrate.

12. The display device according to claim 11, wherein the detection electrode is installed on a surface of the first substrate which is opposite to a surface of the first substrate which faces the second substrate, and

wherein the scanning electrode is installed between the first substrate and the second substrate to face the detection with the first substrate being disposed therebetween.

13. The display device according to claim 12, wherein the scanning electrode extends in a first direction in a surface in which the first substrate and the second substrate face each other, the plurality of scanning electrodes being aligned to be spaced from each other in a second direction perpendicular to the first direction, and

wherein the detection electrode extends in the second direction, the plurality of detection electrodes being aligned to be spaced from each other in the first direction.

14. The display device according to claim 13, wherein the display panel includes:

a plurality of pixels which is aligned in a display area; and

a common electrode which is arranged to be spaced from the plurality of pixels in the display area,

wherein the plurality of scanning electrodes is commonly used as the common electrode.