阅读说明：本技术 显示装置以及电子设备 (Display device and electronic apparatus ) 是由 川岛进 楠本直人 于 2019-02-26 设计创作，主要内容包括：提供一种能够提高图像质量的显示装置。该显示装置包括设置有第一节点、第二节点、第三节点以及显示元件的像素,首先,对第一节点及第二节点写入同一图像数据。接着,在将该图像数据从第二节点读出到第三节点的同时通过电容耦合将该图像数据供应到第一节点的图像数据。通过进行该工作,能够将源极驱动器的输出电压以上的电压供应到显示元件。(Provided is a display device capable of improving image quality. The display device includes a pixel provided with a first node, a second node, a third node, and a display element, and first, the same image data is written to the first node and the second node. Then, the image data is supplied to the image data of the first node by capacitive coupling while the image data is read out from the second node to the third node. By performing this operation, a voltage equal to or higher than the output voltage of the source driver can be supplied to the display element.)

1. A display device, comprising:

a pixel provided with a first node, a second node, a third node, and a display element,

wherein, have the following function:

writing first data to the first node and the second node;

reading out the first data held in the second node to the third node;

generating second data in the first node by capacitive coupling of the first data held in the first node and the first data read out to the third node; and

supplying the second data to the display element for display.

2. A display device, comprising:

a first pixel;

a second pixel;

a first wiring; and

a second wiring line for connecting the first wiring line and the second wiring line,

wherein each of the first pixel and the second pixel is provided with a first node, a second node, a third node, and a display element,

the first wiring is electrically connected to the first pixel,

the second wiring is electrically connected to the first pixel,

the second wiring is electrically connected to the second pixel,

a first function of writing first data to the first node and the second node;

a second function of reading out the first data held in the second node to the third node;

a third function of generating second data in the first node by capacitive coupling of the first data held in the first node and the first data read out to the third node; and

a fourth function of supplying the second data to the display element for display,

a first function operates in the first pixel when a first signal is supplied to the first wiring,

and when a second signal is supplied to the second wiring, the second to fourth functions operate in the first pixel, and the first function operates in the second pixel.

3. A display device, comprising:

a first pixel;

a second pixel;

a first wiring;

a second wiring;

a third wiring; and

a fourth wiring line is provided on the first wiring line,

wherein the first pixel and the second pixel comprise a first transistor, a second transistor, a third transistor, a fourth transistor, a first capacitor, a second capacitor, and a circuit block,

one of a source and a drain of the first transistor is electrically connected to one electrode of the first capacitor,

one electrode of the first capacitor is electrically connected to one of a source and a drain of the second transistor,

the other of the source and the drain of the second transistor is electrically connected to one of the source and the drain of the third transistor,

one of a source and a drain of the third transistor is electrically connected to one electrode of the second capacitor,

the other electrode of the second capacitor is electrically connected to one of a source and a drain of the fourth transistor,

one of a source and a drain of the fourth transistor is electrically connected to the circuit block,

in the first pixel, the first pixel is a pixel,

the other of the source and the drain of the first transistor is electrically connected to the first wiring,

the other of the source and the drain of the fourth transistor is electrically connected to the first wiring,

a gate of the first transistor is electrically connected to the second wiring,

a gate of the second transistor is electrically connected to the third wiring,

a gate of the third transistor is electrically connected to the second wiring,

a gate of the fourth transistor is electrically connected to the second wiring,

in the second pixel, the first pixel is a pixel,

the other of the source and the drain of the first transistor is electrically connected to the first wiring,

the other of the source and the drain of the fourth transistor is electrically connected to the first wiring,

a gate of the first transistor is electrically connected to the third wiring,

a gate of the second transistor is electrically connected to the fourth wiring,

a gate of the third transistor is electrically connected to the third wiring,

a gate of the fourth transistor is electrically connected to the third wiring,

and, the circuit block includes a display element.

4. The display device according to claim 3, wherein the first and second light sources are arranged in a matrix,

wherein the circuit block includes a fifth transistor, a sixth transistor, a third capacitor, and an organic EL element as the display element,

one electrode of the organic EL element is electrically connected to one of a source and a drain of the sixth transistor,

the other of the source and the drain of the sixth transistor is electrically connected to one electrode of the third capacitor,

one electrode of the third capacitor is electrically connected to one of a source and a drain of the fifth transistor,

a gate of the fifth transistor is electrically connected to the other electrode of the third capacitor,

and the other electrode of the third capacitor is electrically connected to the other electrode of the second capacitor.

5. The display device according to claim 4, wherein the first and second light sources are arranged in a matrix,

wherein the other of the source and the drain of the fifth transistor is electrically connected to the other of the source and the drain of the third transistor.

6. The display device according to claim 3, wherein the first and second light sources are arranged in a matrix,

wherein the circuit block includes a seventh transistor, a fourth capacitor, and a liquid crystal element as the display element,

one electrode of the liquid crystal element is electrically connected to one electrode of the fourth capacitor,

one electrode of the fourth capacitor is electrically connected to one of a source and a drain of the seventh transistor,

and the other of the source and the drain of the seventh transistor is electrically connected to the other electrode of the second capacitor.

7. The display device according to claim 6, wherein the first and second light sources are arranged in a matrix,

wherein the other electrode of the fourth capacitor is electrically connected to the other of the source and the drain of the third transistor.

8. The display device according to any one of claims 3 to 7,

wherein the fourth transistor has a metal oxide in a channel formation region,

and the metal oxide contains In, Zn and M (M is Al, Ti, Ga, Ge, Sn, Y, Zr, La, Ce, Nd or Hf).

9. An electronic device, comprising:

the display device of any one of claims 1 to 8; and

a camera.

Technical Field

One embodiment of the present invention relates to a display device.

Note that one embodiment of the present invention is not limited to the above-described technical field. The technical field of one embodiment of the invention disclosed in this specification and the like relates to an object, a method, or a manufacturing method. In addition, one embodiment of the present invention relates to a process (process), a machine (machine), a product (manufacture), or a composition (machine). Thus, more specifically, as an example of the technical field of one embodiment of the present invention disclosed in the present specification, a semiconductor device, a display device, a liquid crystal display device, a light-emitting device, an illumination device, a power storage device, a storage device, an imaging device, a method for driving these devices, or a method for manufacturing these devices can be given.

Note that in this specification and the like, a semiconductor device refers to all devices which can operate by utilizing semiconductor characteristics. A transistor and a semiconductor circuit are one embodiment of a semiconductor device. In addition, the storage device, the display device, the imaging device, and the electronic apparatus may include a semiconductor device.

Background

As a semiconductor thin film which can be applied to a transistor, a silicon-based semiconductor material is widely known, and as another material, an oxide semiconductor has attracted attention. As an oxide semiconductor, for example, a multi-component metal oxide is known in addition to a single-component metal oxide such as indium oxide and zinc oxide. Among the multi-component metal oxides, In-Ga-Zn oxides (hereinafter also referred to as IGZO) have been studied particularly In the presence of fire.

By studying IGZO, a CAAC (c-axis aligned crystalline) structure and nc (nanocrystalline) structure, which are neither single crystal nor amorphous, have been found in oxide semiconductors (see non-patent documents 1 to 3). Non-patent document 1 and non-patent document 2 disclose a technique for manufacturing a transistor using an oxide semiconductor having a CAAC structure. Further, non-patent documents 4 and 5 disclose that an oxide semiconductor having a lower crystallinity than the CAAC structure and the nc structure also has a fine crystal.

Furthermore, a transistor using IGZO as an active layer has an extremely low off-state current (see non-patent document 6), and an LSI and a display device using this characteristic are known (see non-patent documents 7 and 8).

In addition, patent document 1 discloses a memory device having a structure in which a transistor with extremely low off-state current is used for a memory cell.

[ Prior Art document ]

[ patent document ]

[ patent document 1] Japanese patent application laid-open No. 2011-

[ non-patent document ]

[ non-patent document 1] S.Yamazaki et al, "SID Symposium Digest of technical papers", 2012, volume 43, issue 1, p.183-186

[ non-patent document 2] S.Yamazaki et al, "Japanese Journal of Applied Physics", 2014, volume 53, Number 4S, p.04ED18-1-04ED18-10

[ non-patent document 3] S.Ito et al, "The Proceedings of AM-FPD' 13Digest of technical Papers", 2013, p.151-154

[ non-patent document 4] S.Yamazaki et al, "ECS Journal of Solid State Science and technology", 2014, volume 3, issue 9, p.Q3012-Q3022

[ non-patent document 5] S.Yamazaki, "ECS Transactions", 2014, volume 64, issue 10, p.155-164

[ non-patent document 6] K.Kato et al, "Japanese Journal of Applied Physics", 2012, volume 51, p.021201-1-021201-7

[ non-patent document 7] S.Matsuda et al, "2015 Symposium on VLSI Technology Digest of technical Papers", 2015, p.T216-T217

[ non-patent document 8] S.Amano et al, "SID Symposium Digest of Technical Papers", 2010, volume 41, issue 1, p.626-629

Disclosure of Invention

Technical problem to be solved by the invention

The resolution of display devices has been increasing, and hardware capable of displaying images of 8K4K (number of pixels: 7680 × 4320) or higher resolution has been developed. Further, introduction of HDR (high dynamic range) display technology for improving image quality by luminance adjustment has been advanced.

In order to perform clear gradation display, it is desirable to make the range of data potentials that can be supplied to the display element wide. On the other hand, for example, the output voltage of a source driver used in a liquid crystal display device is about 15V, and when a higher voltage is supplied to a display element, a source driver with a high output must be used. High-output source drivers consume high power, and new driver ICs are sometimes developed.

In addition, it is necessary to increase the frame rate in order to display a moving image more smoothly, but the horizontal period is shortened as the number of pixels increases, and thus it is difficult to increase the frame rate. By realizing a structure in which the frame frequency can be easily increased, the structure can be easily applied to a field-sequential liquid crystal display device or the like.

Accordingly, an object of one embodiment of the present invention is to provide a display device capable of improving image quality. Another object of one embodiment of the present invention is to provide a display device capable of supplying a voltage equal to or higher than an output voltage of a source driver to a display element. Another object of one embodiment of the present invention is to provide a display device capable of improving the luminance of a display image. Another object of one embodiment of the present invention is to provide a display device capable of increasing a frame rate.

Another object of one embodiment of the present invention is to provide a display device with low power consumption. Another object of one embodiment of the present invention is to provide a highly reliable display device. Another object of one embodiment of the present invention is to provide a novel display device and the like. Another object of one embodiment of the present invention is to provide a method for driving the display device. Another object of one embodiment of the present invention is to provide a novel semiconductor device and the like.

Note that the description of these objects does not hinder the existence of other objects. It is not necessary for one embodiment of the invention to achieve all of the above objectives. The other objects described above will be apparent from the description, drawings, claims, and the like, and can be extracted from the description, drawings, claims, and the like.

Means for solving the problems

One embodiment of the present invention relates to a display device capable of improving image quality.

One embodiment of the present invention is a display device including a pixel provided with a first node, a second node, a third node, and a display element, the display device including: writing first data into the first node and the second node; reading out the first data held in the second node to the third node; generating second data in the first node by capacitive coupling of the first data held in the first node and the first data read out to the third node; and supplying the second data to the display element for display.

Another aspect of the present invention is a display device including a first pixel, a second pixel, a first wiring and a second wiring, each of the first pixel and the second pixel including a first node, a second node, a third node, and a display element, the first wiring being electrically connected to the first pixel, the second wiring being electrically connected to the second pixel, the display device having a first function of writing first data to the first node and the second node, a second function of reading the first data held in the second node to the third node, a third function of generating second data in the first node by capacitive coupling of the first data held in the first node and the first data read out to the third node, and a fourth function of supplying the second data to the display element to perform display, wherein when a first signal is supplied to the first wiring, the first function operates in the first pixel, and when the second signal is supplied to the second wiring, the second to fourth functions operate in the first pixel and the first function operates in the second pixel.

Another embodiment of the present invention is a display device including a first pixel, a second pixel, a first wiring, a second wiring, a third wiring, and a fourth wiring, wherein the first pixel and the second pixel include a first transistor, a second transistor, a third transistor, a fourth transistor, a first capacitor, a second capacitor, and a circuit block, one of a source and a drain of the first transistor is electrically connected to one electrode of the first capacitor, one electrode of the first capacitor is electrically connected to one of a source and a drain of the second transistor, the other of the source and the drain of the second transistor is electrically connected to one of a source and a drain of the third transistor, one of the source and the drain of the third transistor is electrically connected to one electrode of the second capacitor, the other electrode of the second capacitor is electrically connected to one of a source and a drain of the fourth transistor, one of a source and a drain of a fourth transistor is electrically connected to the circuit block, in the first pixel, the other of the source and the drain of the first transistor is electrically connected to the first wiring, the other of the source and the drain of the fourth transistor is electrically connected to the first wiring, a gate of the first transistor is electrically connected to the second wiring, a gate of the second transistor is electrically connected to the third wiring, a gate of the third transistor is electrically connected to the second wiring, a gate of the fourth transistor is electrically connected to the second wiring, in the second pixel, the other of the source and the drain of the first transistor is electrically connected to the first wiring, the other of the source and the drain of the fourth transistor is electrically connected to the first wiring, the gate of the first transistor is electrically connected to the third wiring, the gate of the second transistor is electrically connected to the fourth wiring, and the gate of the third transistor is electrically connected to the third wiring, the gate of the fourth transistor is electrically connected to the third wiring, and the circuit block includes a display element.

The circuit block may include a fifth transistor, a sixth transistor, a third capacitor, and an organic EL element as a display element, one electrode of the organic EL element may be electrically connected to one of a source and a drain of the sixth transistor, the other of the source and the drain of the sixth transistor may be electrically connected to one electrode of the third capacitor, one electrode of the third capacitor may be electrically connected to one of the source and the drain of the fifth transistor, a gate of the fifth transistor may be electrically connected to the other electrode of the third capacitor, and the other electrode of the third capacitor may be electrically connected to one electrode of the second capacitor.

In the above structure, the other of the source and the drain of the fifth transistor may be electrically connected to the other of the source and the drain of the third transistor.

In addition, the circuit block may also include a seventh transistor, a fourth capacitor, and a liquid crystal element as a display element, one electrode of the liquid crystal element may be electrically connected to one electrode of the fourth capacitor, one electrode of the fourth capacitor may be electrically connected to one of a source and a drain of the seventh transistor, and the other of the source and the drain of the seventh transistor may be electrically connected to one electrode of the second capacitor.

In the above structure, the other electrode of the fourth capacitor may be electrically connected to the other of the source and the drain of the third transistor.

The fourth transistor preferably has a metal oxide In the channel formation region, the metal oxide preferably containing In, Zn, and M (M is Al, Ti, Ga, Sn, Y, Zr, La, Ce, Nd, or Hf).

Effects of the invention

By using one embodiment of the present invention, a display device which can improve image quality can be provided. In addition, a display device which can supply a voltage equal to or higher than the output voltage of the source driver to the display element can be provided. In addition, a display device capable of improving the luminance of a display image can be provided. In addition, a display device capable of improving a frame rate can be provided.

In addition, a display device with low power consumption can be provided. Further, a display device with high reliability can be provided. In addition, a novel display device or the like can be provided. In addition, a driving method of the display device may be provided. In addition, a novel semiconductor device and the like can be provided.