DISPLAY DEVICE

• US 20170249883A1
• Filed: 02/16/2017
• Published: 08/31/2017
• Est. Priority Date: 02/26/2016
• Status: Active Grant

• Current Assignee: Trivale Technologies, LLC (Vector Capital Corporation)
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: TANAHARA, Manabu
• Granted Patent: US 10,522,063 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2320/0214 with crosstalk due to leakage current of pixel switch in active matrix panels
• CPC Class Codes: G09G 2320/103 Detection of image changes, e.g. determination of an index representative of the image change
• CPC Class Codes: G09G 2330/12 Test circuits or failure detection circuits included in a display system, as permanent part thereof
• CPC Class Codes: G09G 3/006 Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

In a display period, a display device applies a voltage of a level for turning a state of an inspection switching element to an OFF state to a gate electrode of the inspection switching element. Moreover, in a vertical blanking period while a state of a switching element is the OFF state, the display device performs voltage application processing for applying a voltage, which indicates an ON level, or a voltage, which indicates a level between the ON level and an OFF level, to the gate electrode of the switching element.

Claims

1. A display device that displays a video, comprising:

a first switching element for use in displaying said video; and

a second switching element for inspecting a state of said first switching element,

wherein said display device displays said video by driving said first switching element,

a switching element that is each of said first switching element and said second switching element has a first electrode, a second electrode and a third electrode,

a state of said switching element includes;

an ON state where said first electrode and said second electrode of the switching element are electrically connected to each other; and

an OFF state where the first electrode and second electrode of the switching element are not electrically connected to each other,

said third electrode is an electrode to be selectively applied with a first voltage that is a voltage for turning the state of said switching element to said ON state and a second voltage that is a voltage for turning the state of the switching element to said OFF state,

said second electrode of said second switching element is connected to said first switching element,

in a display period that is a period while said display device is displaying said video, the display device applies an OFF second voltage, which is said second voltage for turning a state of said second switching element that is the switching element to said OFF state, to said third electrode of the second switching element, and

in a period while a state of said first switching element is said OFF state, said display device performs voltage application processing for applying said first voltage or a third voltage, which indicates a value between a value of said OFF second voltage and a value of the first voltage, to said third electrode of said second switching element.

2. The display device according to claim 1,

wherein said video which said display device displays is expressed in such a manner that the display device sequentially displays a plurality of frames which are static images, and

said display device performs said voltage application processing in a vertical blanking period that is a period between a period while an n-th frame among said plurality of frames is displayed and a period while an (n+1)-th frame among the plurality of frames is displayed.

3. The display device according to claim 1,

wherein said video includes a static image,

a period for allowing said display device to display a whole of said static image includes a horizontal blanking period, and

said display device performs said voltage application processing in said horizontal blanking period.