DETECTION SIGNAL SELECTING CIRCUIT, THIN FILM TRANSISTOR SUBSTRATE, AND DISPLAY PANEL

• US 20190333432A1
• Filed: 08/28/2018
• Published: 10/31/2019
• Est. Priority Date: 04/28/2018
• Status: Active Grant

• Current Assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Chen, Caiqin, Wang, Yiyi, Wang, Shaobo
• Granted Patent: US 10,769,978 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2310/0264 Details of driving circuits
• CPC Class Codes: G09G 2310/0283 Arrangement of drivers for different directions of scanning
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• 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 3/20 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 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G11C 19/28 using semiconductor elements G11C19/14, G11C19/36 take precedence
• 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

Abstract

The selecting circuit includes first and second switch units. The first switch unit includes a first control terminal, a first input terminal, and a first output terminal. The second switch unit includes a second control terminal, a second input terminal, and a second output terminal. The first output terminal connects to the second output terminal, the first input terminal connects to an output terminal of a first-stage of driving units, the second input terminal connects to an output terminal of a last-stage of the driving units. A first control signal inputted from the first control terminal controls the first switch unit to be turned on or off, a second control signal inputted from the second control terminal controls the second switch unit to be turned on or off, to selectively output an output signal of first or second output terminals based on an output sequence of the scan driving signal.

Claims

1. A detection signal selecting circuit, used in a scan driving circuit of a display panel, the scan driving circuit comprising multi-stages driving units, each stage of the driving units outputting a scan driving signal, wherein the detection signal selecting circuit comprises:

a first switch unit and a second switch unit, the first switch unit comprising a first control terminal, a first input terminal, and a first output terminal, the second switch unit comprising a second control terminal, a second input terminal, and a second output terminal, the first output terminal connecting to the second output terminal, the first input terminal connecting to an output terminal of a first-stage of the driving units, and the second input terminal connecting to an output terminal of a last-stage of the driving units;

wherein a first control signal inputted from the first control terminal controls the first switch unit to be turned on or off, and a second control signal inputted from the second control terminal controls the second switch unit to be turned on or off, to selectively output an output signal of the first output terminal or an output signal of the second output terminal based on an output sequence of the scan driving signal;

wherein the first switch unit comprises a first thin-film transistor, the first thin-film transistor comprises a first gate, a first source, and a first drain, the first gate connects to the first control terminal, the first source or the first drain connects to the first input terminal, and another one of the first source and the first drain connects to the first output terminal; and

wherein the second switch unit comprises a second thin-film transistor, the second thin-film transistor comprises a second gate, a second source, and a second drain, the second gate connects to the second control terminal, the second source or the second drain connects to the second input terminal, and another one of the second source and the second drain connects to the second output terminal.

2. The detection signal selecting circuit according to claim 1, wherein the scan driving circuit is a gate scan driving circuit or a light-emitting pixel driving circuit.

3. The detection signal selecting circuit according to claim 1, wherein the first thin-film transistor is a p-channel metal oxide semiconductor (PMOS) transistor or an n-channel metal oxide semiconductor (NMOS) transistor.

4. The detection signal selecting circuit according to claim 1, wherein the second thin-film transistor is a PMOS transistor or an NMOS transistor.

5. A thin film transistor substrate, comprising a scan driving circuit and a detection signal selecting circuit connected to one another;

wherein the scan driving circuit comprises multi-stages driving units, and each stage of the driving units outputs a scan driving signal;

wherein the detection signal selecting circuit comprises;

a first switch unit and a second switch unit, the first switch unit comprises a first control terminal, a first input terminal, and a first output terminal, the second switch unit comprises a second control terminal, a second input terminal, and a second output terminal, the first output terminal connects to the second output terminal, the first input terminal connects to an output terminal of a first-stage of the driving units, and the second input terminal connects to an output terminal of a last-stage of the driving units; and

wherein a first control signal inputted from the first control terminal controls the first switch unit to be turned on or off, and a second control signal inputted from the second control terminal controls the second switch unit to be turned on or off, to selectively output an output signal of the first output terminal or an output signal of the second output terminal based on an output sequence of the scan driving signal.

6. The thin film transistor substrate according to claim 5, wherein the first switch unit comprises a first thin-film transistor, the first thin-film transistor comprises a first gate, a first source, and a first drain, the first gate connects to the first control terminal, the first source or the first drain connects to the first input terminal, and another one of the first source and the first drain connects to the first output terminal.

7. The thin film transistor substrate according to claim 5, wherein the second switch unit comprises a second thin-film transistor, the second thin-film transistor comprises a second gate, a second source, and a second drain, the second gate connects to the second control terminal, the second source or the second drain connects to the second input terminal, and another one of the second source and the second drain connects to the second output terminal.

8. The thin film transistor substrate according to claim 5, further comprising:

a first power signal input terminal, a second power signal input terminal, a first clock signal input terminal, a second clock signal input terminal, and a stage-shift signal output circuit;

wherein each stage of the driving units comprises a stage-shift signal input terminal, a first driving input terminal, a second driving input terminal, a first clock input terminal, a second clock input terminal, and a driving signal output terminal, the stage-shift signal input terminal connects to the stage-shift signal output circuit, the first driving input terminal connects to the first power signal input terminal, the second driving input terminal connects to the second power signal input terminal, the first clock input terminal connects to the first clock signal input terminal, the second clock input terminal connects to the second clock signal input terminal, and the driving signal output terminal outputs the scan driving signal; and

wherein a first power signal inputted from the first power signal input terminal is opposite, in electric potential, to a second power signal inputted from the second power input terminal, and a first clock signal inputted from the first clock signal input terminal is opposite, in electric potential, to a second clock signal inputted from the second clock signal input terminal.

9. The thin film transistor substrate according to claim 8, further comprising:

an initial stage-shift signal input terminal;

wherein the stage-shift signal output circuit comprises multi-stages stage-shift signal output units, each stage of the stage-shift signal output units comprises a stage-shift signal first input terminal, a stage-shift signal second input terminal, a stage-shift signal third input terminal, a stage-shift signal fourth input terminal, and a stage-shift signal output terminal, the stage-shift signal first input terminal connects to an output terminal of a previous stage of the driving units, the stage-shift signal second input terminal connects to the first control signal input terminal, the stage-shift signal third input terminal connects to the second control signal input terminal, the stage-shift signal fourth input terminal connects to an output terminal of a next stage of the driving units, and the stage-shift signal output terminal connects to the stage-shift signal input terminal of a corresponding stage of the driving units; and

wherein both the stage-shift signal first input terminal of a first-stage of the stage-shift signal output units and the stage-shift signal fourth input terminal of a last-stage of the stage-shift signal output units connect to the initial stage-shift signal input terminal.

10. The thin film transistor substrate according to claim 9, wherein the stage-shift signal output unit comprises a third thin-film transistor and a fourth thin-film transistor, the third thin-film transistor comprises a third gate, a third source, and a third drain, the third gate connects to the stage-shift signal third input terminal, the third source or the third drain connects to the stage-shift signal first input terminal, the fourth thin-film transistor comprises a fourth gate, a fourth source, and a fourth drain, the fourth gate connects to the stage-shift signal second input terminal, the fourth source or the fourth drain connects to the stage-shift signal fourth input terminal, and both another one of the third source and the third drain and another one of the fourth source and the fourth drain connect to the stage-shift signal output terminal.

11. The thin film transistor substrate according to claim 9, wherein the stage-shift signal output unit comprises a fifth thin-film transistor and a sixth thin-film transistor, the fifth thin-film transistor comprises a fifth gate, a fifth source, and a fifth drain, the fifth gate connects to the stage-shift signal first input terminal, the fifth source or the fifth drain connects to the stage-shift signal third input terminal, the sixth thin-film transistor comprises a sixth gate, a sixth source, and a sixth drain, the sixth gate connects to the stage-shift signal fourth input terminal, the sixth source or the sixth drain connects to the stage-shift signal second input terminal, and both another one of the fifth source and the fifth drain and another one of the sixth source and the sixth drain connect to the stage-shift signal output terminal.

12. The thin film transistor substrate according to claim 5, wherein the scan driving circuit is a gate scan driving circuit or a light-emitting pixel driving circuit.

13. The thin film transistor substrate according to claim 5, wherein the first thin-film transistor or the second thin-film transistor is a PMOS transistor or an NMOS transistor.

14. A display panel, at least comprising a thin film transistor substrate;

wherein the thin film transistor substrate comprises a scan driving circuit and a detection signal selecting circuit connected to one another;

wherein the scan driving circuit comprises multi-stages driving units, and each stage of the driving units outputs a scan driving signal;

wherein the detection signal selecting circuit comprises;

a first switch unit and a second switch unit, the first switch unit comprises a first control terminal, a first input terminal, and a first output terminal, the second switch unit comprises a second control terminal, a second input terminal, and a second output terminal, the first output terminal connects to the second output terminal, the first input terminal connects to an output terminal of a first-stage of the driving units, and the second input terminal connects to an output terminal of a last-stage of the driving units; and

wherein a first control signal inputted from the first control terminal controls the first switch unit to be turned on or off, and a second control signal inputted from the second control terminal controls the second switch unit to be turned on or off, to selectively output an output signal of the first output terminal or an output signal of the second output terminal based on an output sequence of the scan driving signal.

15. The display panel according to claim 14, wherein the first switch unit comprises a first thin-film transistor, the first thin-film transistor comprises a first gate, a first source, and a first drain, the first gate connects to the first control terminal, the first source or the first drain connects to the first input terminal, and another one of the first source and the first drain connects to the first output terminal.

16. The display panel according to claim 14, wherein the second switch unit comprises a second thin-film transistor, the second thin-film transistor comprises a second gate, a second source, and a second drain, the second gate connects to the second control terminal, the second source or the second drain connects to the second input terminal, and another one of the second source and the second drain connects to the second output terminal.

17. The display panel according to claim 16, wherein the thin film transistor substrate further comprises:

a first power signal input terminal, a second power signal input terminal, a first clock signal input terminal, a second clock signal input terminal, and a stage-shift signal output circuit;

each stage of the driving units comprises a stage-shift signal input terminal, a first driving input terminal, a second driving input terminal, a first clock input terminal, a second clock input terminal, and a driving signal output terminal, the stage-shift signal input terminal connects to the stage-shift signal output circuit, the first driving input terminal connects to the first power signal input terminal, the second driving input terminal connects to the second power signal input terminal, the first clock input terminal connects to the first clock signal input terminal, the second clock input terminal connects to the second clock signal input terminal, and the driving signal output terminal outputs the scan driving signal; and

wherein a first power signal inputted from the first power signal input terminal is opposite, in electric potential, to a second power signal inputted from the second power input terminal, and a first clock signal inputted from the first clock signal input terminal is opposite, in electric potential, to a second clock signal inputted from the second clock signal input terminal.

18. The display panel according to claim 16, wherein the thin film transistor substrate further comprises:

an initial stage-shift signal input terminal;

the stage-shift signal output circuit comprises multi-stages stage-shift signal output units, each stage of the stage-shift signal output units comprises a stage-shift signal first input terminal, a stage-shift signal second input terminal, a stage-shift signal third input terminal, a stage-shift signal fourth input terminal, and a stage-shift signal output terminal, the stage-shift signal first input terminal connects to an output terminal of a previous stage of the driving units, the stage-shift signal second input terminal connects to the first control signal input terminal, the stage-shift signal third input terminal connects to the second control signal input terminal, the stage-shift signal fourth input terminal connects to an output terminal of a next stage of the driving units, and the stage-shift signal output terminal connects to the stage-shift signal input terminal of a corresponding stage of the driving units; and

wherein both the stage-shift signal first input terminal of a first-stage of the stage-shift signal output units and the stage-shift signal fourth input terminal of a last-stage of the stage-shift signal output units connect to the initial stage-shift signal input terminal.

19. The display panel according to claim 18, wherein the stage-shift signal output unit comprises a third thin-film transistor and a fourth thin-film transistor, the third thin-film transistor comprises a third gate, a third source, and a third drain, the third gate connects to the stage-shift signal third input terminal, the third source or the third drain connects to the stage-shift signal first input terminal, the fourth thin-film transistor comprises a fourth gate, a fourth source, and a fourth drain, the fourth gate connects to the stage-shift signal second input terminal, the fourth source or the fourth drain connects to the stage-shift signal fourth input terminal, and both another one of the third source and the third drain and another one of the fourth source and the fourth drain connect to the stage-shift signal output terminal.

20. The display panel according to claim 18, wherein the stage-shift signal output unit comprises a fifth thin-film transistor and a sixth thin-film transistor, the fifth thin-film transistor comprises a fifth gate, a fifth source, and a fifth drain, the fifth gate connects to the stage-shift signal first input terminal, the fifth source or the fifth drain connects to the stage-shift signal third input terminal, the sixth thin-film transistor comprises a sixth gate, a sixth source, and a sixth drain, the sixth gate connects to the stage-shift signal fourth input terminal, the sixth source or the sixth drain connects to the stage-shift signal second input terminal, and both another one of the fifth source and the fifth drain and another one of the sixth source and the sixth drain connect to the stage-shift signal output terminal.