Display apparatus

• US 9,542,888 B2
• Filed: 05/27/2016
• Issued: 01/10/2017
• Est. Priority Date: 10/19/2012
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Omata, Kazuyoshi, Kimura, Hiroyuki, Shibusawa, Makoto, Tabatake, Hiroshi
• Primary Examiner(s): NGUYEN, KIMNHUNG T
• Application Number:
  US15/167,401
• Publication Number:
  US 20160275855A1
• Time in Patent Office: 228 Days
• Field of Search: 345 76- 83, 345/690, 313/343, 313/396, 313/498, 313/500, 313/506
• US Class Current: 1/1
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0852 being a dynamic memory with more than one capacitor
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2310/0262 The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/325 the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H05B 45/60 Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors
• 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 59/351 : comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: Y02B 20/30 : Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

According to one embodiment, a display apparatus includes a plurality of semiconductor layers, a first insulation film, a first conductive layer, a second insulation film and a display element includes a second conductive layer. The first conductive layer and the second conductive layer are opposed to each other to form a capacitance unit.

Claims

1. A display apparatus having a plurality of pixels arrayed in a matrix along a row direction and a column direction comprising:

a semiconductor layer;

a first insulation film above the semiconductor layer;

a first conductive layer on the first insulation film;

a second insulation film on the first insulation film and the first conductive layer; and

a second conductive layer on the second insulation film,

each of the plurality of pixels comprising;

a display element between a high-potential power supply and a low-potential power supply;

a drive transistor between the high-potential power supply and the display element, and configured to determine a value of current to the display element;

a pixel switch configured to select whether a video signal is input to a gate electrode of the drive transistor; and

a holding capacitance between the gate electrode of the drive transistor and a source electrode of the drive transistor;

wherein

the drive transistor and the pixel switch are formed by using the semiconductor layer, and

one of electrodes of the holding capacitance and one of electrodes of the display element are formed by using the second conductive layer.

2. The display apparatus according to claim 1, wherein

the drive transistor includes the gate electrode, the source electrode, and a drain electrode,

the source electrode of the drive transistor is electrically connected to the display element,

the drain electrode of the drive transistor is electrically connected to the high-potential power supply,

the pixel switch includes a first electrode and a second electrode,

the first electrode of the pixel switch is electrically connected to a video signal line, and

the second electrode of the pixel switch is electrically connected to the gate electrode of the drive transistor.

3. The display apparatus according to claim 1, further comprising:

an output switch between the high-potential power supply and the drive transistor, and configured to select whether the current from the high-potential power supply is supplied to the display element, wherein

the output switch is formed by using the semiconductor layer.

4. The display apparatus according to claim 3, wherein

the output switch includes a first electrode and a second electrode,

the first electrode of the output switch is electrically connected to the high-potential power supply, and

the second electrode of the output switch is electrically connected to the drain electrode of the drive transistor.

5. The display apparatus according to claim 3, wherein

the output switch is shared by adjacent two pixels of the plurality of pixels.

6. The display apparatus according to claim 1, further comprising:

an auxiliary capacitance between the one of electrodes of the display element and a constant potential power supply, wherein

the first conductive layer and the second conductive layer are opposed to each other to form the auxiliary capacitance.

7. The display apparatus according to claim 6, wherein

the constant potential power supply is one of the high-potential power supply and the low-potential power supply.