Semiconductor device, display system, and electronic device

• US 10,319,743 B2
• Filed: 12/11/2017
• Issued: 06/11/2019
• Est. Priority Date: 12/16/2016
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kurokawa, Yoshiyuki
• Primary Examiner(s): Picardat, Kevin M
• Application Number:
  US15/837,270
• Publication Number:
  US 20180175074A1
• Time in Patent Office: 547 Days
• Field of Search: None
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2300/0417 Special arrangements specific to the use of low carrier mobility technology
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/0289 Details of voltage level shifters arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/0291 Details of output amplifiers or buffers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/0294 Details of sampling or holding circuits arranged for use in a driver for data electrodes
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 2360/144 the light being ambient light
• 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
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 5/39 Control of the bit-mapped memory
• CPC Class Codes: G09G 5/393 Arrangements for updating the contents of the bit-mapped memory
• CPC Class Codes: H01L 21/283 Deposition of conductive or insulating materials for electrodes conducting electric current
• CPC Class Codes: H01L 27/0688 Integrated circuits having a three-dimensional layout
• CPC Class Codes: H01L 27/1225 with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/131 : Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 71/00 : Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/40 : Thermal treatment, e.g. annealing in the presence of a solvent vapour
• CPC Class Codes: H10K 77/10 : Substrates, e.g. flexible substrates

Abstract

A novel semiconductor device or display device is provided. A semiconductor substrate is used as a substrate of a display portion and a transistor in the display portion is formed using the semiconductor substrate. In this way, variation in the characteristics of the transistors among pixels is reduced and pixel density can be increased. Moreover, transistors used for a driver circuit, a signal generation circuit, and a level shifter are formed using the semiconductor substrate. As a result, these circuits can be formed directly on the substrate of the display portion, whereby bonding of a chip and the substrate is unnecessary. Furthermore, these circuits can be easily connected to each other, so that signal delay or an increase in power consumption due to complicated wirings can be prevented.

Claims

1. A semiconductor device comprising:

a pixel portion comprising a pixel comprising a first transistor;

a driver circuit comprising a second transistor;

a signal generation circuit comprising a third transistor and a fourth transistor; and

a level shifter comprising a fifth transistor,

wherein the level shifter is configured to amplify a signal input from the signal generation circuit and output an amplified signal to the driver circuit,

wherein a channel region of the first transistor, a channel region of the second transistor, and a channel region of the third transistor are formed in a semiconductor substrate,

wherein each of a channel region of the fourth transistor and a channel region of the fifth transistor is formed in a semiconductor film, and

wherein the semiconductor film comprises a metal oxide.

2. The semiconductor device according to claim 1,

wherein the signal generation circuit comprises a memory device, and

wherein the memory device comprises the fourth transistor.

3. The semiconductor device according to claim 1,

wherein the fourth transistor and the fifth transistor are stacked over the first transistor, the second transistor, and the third transistor.

4. The semiconductor device according to claim 1,

wherein the pixel comprises a sixth transistor and a light-emitting element,

wherein one of a source and a drain of the first transistor is electrically connected to one electrode of the light-emitting element,

wherein one of a source and a drain of the sixth transistor is electrically connected to a gate of the first transistor, and

wherein a channel region of the sixth transistor is formed in a semiconductor film containing a metal oxide.

5. The semiconductor device according to claim 1,

wherein the semiconductor substrate is a single crystal silicon substrate, a single crystal germanium substrate, a compound semiconductor substrate, or an SOI substrate.

6. A display system comprising:

the semiconductor device according to claim 1; and

a host,

wherein the signal generation circuit is configured to generate a video signal on the basis of image data input from the host.

7. The display system according to claim 6,

wherein the semiconductor device comprises an arithmetic circuit,

wherein the host comprises software,

wherein the arithmetic circuit constitutes a first neural network,

wherein the software constitutes a second neural network,

wherein the first neural network is configured to output a parameter used for image processing on the basis of information on an environment where video displayed on the pixel portion is seen,

wherein the second neural network is configured to perform supervised learning, and

wherein a weight coefficient of the second neural network updated by the supervised learning is output to the first neural network.

8. An electronic device comprising the display system according to claim 6.