ACTIVE MATRIX DISPLAY APPARATUS AND ELECTRONIC APPARATUS

• US 20080062096A1
• Filed: 09/10/2007
• Published: 03/13/2008
• Est. Priority Date: 09/11/2006
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Uchino, Katsuhide, Yamashita, Junichi
• Granted Patent: US 7,884,785 B2
• Time in Patent Office: Days
• US Class Current: 345/82
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• 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 2300/0866 by means of changes in the pixel supply voltage
• CPC Class Codes: G09G 2300/0871 with level shifting
• CPC Class Codes: G09G 2310/066 Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 3/2074 using sub-pixels
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 71/861 Repairing

Abstract

An active matrix display apparatus includes a substrate having scanning lines, signal lines, and pixels thereon. Each of the pixels includes a sampling transistor for taking in a video signal, a drive transistor for generating a driving current, and a light-emitting device which emits light with luminance in accordance with the video signal. The two-terminal thin-film light-emitting device includes an anode and cathode electrodes, and a light-emitting layer arranged therebetween. At least one of the electrodes is divided into pieces whereby the light-emitting device is divided into sub-light-emitting devices. The sub-light-emitting devices receive the driving current from a driving transistor and emit light with luminance in accordance with the video signal. A sub-light-emitting devices including a short-circuit defect is separated from the corresponding one of the pixels and the driving current is supplied to the remaining sub-light-emitting devices, whereby the luminance in accordance with the video signal is maintained.

Claims

1. An active matrix display apparatus including scanning lines as rows for supplying control signals, signal lines as columns for supplying video signals, pixels arranged in matrix so as to correspond to intersections of the scanning lines and the signal lines, and a substrate on which the scanning lines, the signal lines, and the pixels are arranged, each of the pixels comprising:

a sampling transistor used to take in one of the video signals in response to one of the control signals;

a drive transistor used to generate a driving current in accordance with the taken video signal; and

a light-emitting device which emits light with luminance in accordance with the video signal when the driving current is supplied,

wherein the light-emitting device includes a pair of electrodes, that is, an anode and a cathode, and a light-emitting layer arranged between the pair of electrodes, and therefore is a two-terminal thin-film device, at least one of the pair of electrodes is divided into a plurality of pieces whereby the light-emitting device is divided into a plurality of sub-light-emitting devices, the plurality of sub-light-emitting devices receive the driving current from the drive transistor and emit light with luminance as a whole in accordance with the video signal, and when one of the sub-light-emitting devices includes a short-circuit defect, the sub-light-emitting device including the short-circuit defect is separated from the corresponding one of the pixels and the driving current is supplied to the remaining sub-light-emitting devices, and the luminance in accordance with the video signal is maintained using the remaining sub-light-emitting devices.

2. The active matrix display apparatus according to claim 1,

wherein each of the plurality of electrodes obtained by dividing one of the pair of electrodes is connected to a corresponding path of a current supplied from the single drive transistor through a corresponding line, and when the line is broken by a laser beam emitted from the outside of the substrate, the sub-light-emitting device including the short-circuit defect is separated from the current path.

3. An electronic apparatus including the display apparatus set forth in claim 1.