US-12620357-B2 - Display device and electronic device

US12620357B2US 12620357 B2US12620357 B2US 12620357B2US-12620357-B2

Abstract

A display device with high luminance is provided. A pixel includes a light-emitting device, a first transistor, a second transistor, a third transistor, a fourth transistor, a first capacitor, and a second capacitor. One electrode of the light-emitting device is electrically connected to one of a source and a drain of the first transistor. A gate of the first transistor is electrically connected to one electrode of the first capacitor and one of a source and a drain of the second transistor. The other of the source and the drain of the first transistor is electrically connected to one electrode of the second capacitor. One electrode of the second capacitor is electrically connected to a first wiring having a function of supplying a first potential. The other electrode of the second capacitor is electrically connected to the other electrode of the first capacitor, one of a source and a drain of the third transistor, and one of a source and a drain of the fourth transistor.

Inventors

Takashi Nakagawa
Hidetomo Kobayashi
Hideaki Shishido

Assignees

SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20241218
Priority Date: 20191011

Claims (8)

1 . A display device comprising: a signal line, a first power supply line, and a first wiring, each extending in a first direction; a first scan line, a second scan line, and a second power supply line, each extending in a second direction crossing the first direction; and a pixel electrode over the first scan line, the second scan line, and the second power supply line, wherein, in plan view, the first power supply line is interposed between the signal line and the first wiring, wherein, in plan view, the second power supply line is interposed between the first scan line and the second scan line, and wherein the first power supply line is connected to the second power supply line at a portion between the first scan line and the second scan line.
2 . The display device according to claim 1 , wherein the first scan line, the second scan line, and the second power supply line are provided over the signal line, the first power supply line, and the first wiring.
3 . The display device according to claim 1 , wherein a width of the first power supply line is larger than a width of the second power supply line.
4 . The display device according to claim 1 , wherein the first wiring is configured to supply a reference potential for driving the pixel electrode.
5 . A display device comprising: a signal line, a first power supply line, and a first wiring, each extending in a first direction; a first scan line, a second scan line, and a second power supply line, each extending in a second direction crossing the first direction; and a pixel electrode over the first scan line, the second scan line, and the second power supply line, wherein, in plan view, the first power supply line is interposed between the signal line and the first wiring, wherein, in plan view, the second power supply line is interposed between the first scan line and the second scan line, wherein the first power supply line is connected to the second power supply line at a portion between the first scan line and the second scan line, and wherein the pixel electrode does not overlap the signal line.
6 . The display device according to claim 5 , wherein the first scan line, the second scan line, and the second power supply line are provided over the signal line, the first power supply line, and the first wiring.
7 . The display device according to claim 5 , wherein a width of the first power supply line is larger than a width of the second power supply line.
8 . The display device according to claim 5 , wherein the first wiring is configured to supply a reference potential for driving the pixel electrode.

Description

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 technical field. Examples of the technical field of one embodiment of the present invention disclosed in this specification and the like include a semiconductor device, a display device, a light-emitting device, a power storage device, a memory device, an electronic device, a lighting device, an input device, an input/output device, a driving method thereof, and a manufacturing method thereof. A semiconductor device generally means a device that can function by utilizing semiconductor characteristics. BACKGROUND ART As a semiconductor material that can be used in a transistor, an oxide semiconductor using a metal oxide has been attracting attention. For example, Patent Document 1 discloses a semiconductor device that achieves increased field-effect mobility (simply referred to as mobility, μFE, or μ in some cases) by stacking a plurality of oxide semiconductor layers, containing indium and gallium in an oxide semiconductor layer serving as a channel in the plurality of oxide semiconductor layers, and making the proportion of indium higher than the proportion of gallium. A metal oxide that can be used for a semiconductor layer can be formed by a sputtering method or the like, and thus can be used for a transistor included in a large display device. In addition, capital investment can be reduced because part of production equipment for transistors using polycrystalline silicon or amorphous silicon can be retrofitted and utilized. A transistor using a metal oxide has field-effect mobility higher than that in the case where amorphous silicon is used; thus, a high-functional display device provided with a driver circuit can be obtained. In addition, as display devices for augmented reality (AR) or virtual reality (VR), wearable display devices and stationary display devices are becoming widespread. Examples of wearable display devices include a head mounted display (HMD) and an eyeglass-type display device. Examples of stationary display devices include a head-up display (HUD). In an electronic device having an imaging device such as a digital camera, a viewfinder is used to check an image to be captured before capturing the image. An electronic viewfinder is used as the viewfinder. A display portion is provided in the electronic viewfinder, and an image obtained by an image pickup device can be displayed as an image on the display portion. For example, Patent Document 2 discloses an electronic viewfinder that can provide a good visibility state from a central portion of an image to a peripheral portion of the image. REFERENCE Patent Document [Patent Document 1] Japanese Published Patent Application No. 2014-7399[Patent Document 2] Japanese Published Patent Application No. 2012-42569 SUMMARY OF THE INVENTION Problems to be Solved by the Invention With a display device whose display portion is close to the user, such as an HMD, the user is likely to perceive pixels and strongly feels granularity, whereby the sense of immersion or realistic feeling of AR and VR might be diminished. Therefore, an HMD requires a display device that has minute pixels, i.e., a high resolution display device, so that pixels are not perceived by the user. The pixel density of the display device is, for example, preferably 1000 ppi or higher, further preferably 5000 ppi or higher, and still further preferably 7000 ppi or higher. In AR applications, an image of a virtual space is displayed overlapping with a real space; thus, a display device with high luminance is desired in the light usage environment, in particular. In view of the above, an object of one embodiment of the present invention is to provide a high-resolution display device. Another object of one embodiment of the present invention is to provide a display device with high luminance. Alternatively, an 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 display device with a narrow bezel. Another object of one embodiment of the present invention is to provide a small-size display device. Another object of one embodiment of the present invention is to provide a novel display device. Note that the description of these objects does not preclude the existence of other objects. One embodiment of the present invention does not have to achieve all of these objects. Objects other than these can be derived from the description of the specification, the drawings, the claims, and the like. Means for Solving the Problems One embodiment of the present invention is a display device including a pixel portion having a plurality of pixels, a first wiring, a second wiring, a third wiring, and a fourth wiring. The pixels each include a light-emitting device, a first transistor, a second transistor, a third