CN-117854445-B - Display device

CN117854445BCN 117854445 BCN117854445 BCN 117854445BCN-117854445-B

Abstract

A display device includes pixel circuits provided in a plurality of pixels, a plurality of flip-flop circuits provided in a shift register, and reset elements provided in the plurality of flip-flop circuits, respectively, wherein the reset elements are n-channel transistors, the pixel circuits include light emitting elements, light emitting power sources, and switching elements, and the light emitting elements are disconnected from the light emitting power sources during a period in which the light emitting power sources are rising.

Inventors

HARADA KOJI
MORITA TETSUO

Assignees

株式会社日本显示器

Dates

Publication Date: 20260505
Application Date: 20230927
Priority Date: 20221006

Claims (8)

1. A display device is provided with: A plurality of pixels; pixel circuits respectively arranged on the pixels; A plurality of scan lines connected to the plurality of pixels; a plurality of signal lines connected to the plurality of pixels; a scanning line driving circuit connected to the plurality of scanning lines; a signal line driver circuit connected to the plurality of pixels; a shift register provided in the scanning line driving circuit; a plurality of flip-flop circuits provided in the shift register, and Reset elements respectively arranged on the trigger circuits, The reset element is an n-channel transistor, The pixel circuit has a light emitting element, a light emitting power source, and a switching element, The light-emitting power supply includes a high potential power supply and a low potential power supply, The high potential power supply, the switching element, the light emitting element, and the low potential power supply are connected in series, A light emission signal is output from each of the plurality of flip-flop circuits, the light emitting element emits light when the light emission signal is input to the switching element, When the power supply signal changes from low level to high level, the reset signal changes from low level to high level, When the reset signal of high level is input to the reset element, the reset element is set to an on state, Each of the plurality of flip-flop circuits outputs a high-level light emission signal when the reset element is set to an on state, When the light-emitting signal is at a high level, the light-emitting element is disconnected from the high potential power source and the low potential power source, When the light emitting element is disconnected from the high potential power supply and the low potential power supply, the start-up of the high potential power supply and the low potential power supply is completed.
2. The display device of claim 1, wherein, The light emitting element is an organic electroluminescent element.
3. The display device of claim 1, wherein, The flip-flop circuit is provided with a NOR gate or not gate, a transfer gate, and an inverter, One of a source and a drain of the n-channel transistor is connected to an output terminal of the NOR gate and an input terminal of the inverter, The other of the source and the drain of the n-channel transistor is connected to a low potential power supply, A reset signal is input to the gate of the n-channel transistor, And outputting a light-emitting signal to the pixel circuit from an output terminal of the inverter.
4. The display device of claim 1, wherein, During the period when the light emitting power supply is rising, a reset signal inputted to the gate of the n-channel transistor is at a low level.
5. A display device is provided with: A plurality of pixels; pixel circuits respectively arranged on the pixels; A plurality of scan lines connected to the plurality of pixels; a plurality of signal lines connected to the plurality of pixels; a scanning line driving circuit connected to the plurality of scanning lines; a signal line driver circuit connected to the plurality of pixels; a shift register provided in the scanning line driving circuit; a plurality of flip-flop circuits provided in the shift register, and Reset elements respectively connected with the trigger circuits, The reset element is a NAND gate or NAND gate, The pixel circuit has a light emitting element, a light emitting power source, and a switching element, The light-emitting power supply includes a high potential power supply and a low potential power supply, The high potential power supply, the switching element, the light emitting element, and the low potential power supply are connected in series, A light emission signal is output from each of the plurality of flip-flop circuits, the light emitting element emits light when the light emission signal is input to the switching element, When the power supply signal changes from low level to high level, the reset signal changes from low level to high level, When the reset signal of high level is input to the reset element, the reset element is set to an on state, Each of the plurality of flip-flop circuits outputs a high-level light emission signal when the reset element is set to an on state, When the light-emitting signal is at a high level, the light-emitting element is disconnected from the high potential power source and the low potential power source, When the light emitting element is disconnected from the high potential power supply and the low potential power supply, the start-up of the high potential power supply and the low potential power supply is completed.
6. The display device of claim 5, wherein, The light emitting element is an organic electroluminescent element.
7. The display device of claim 5, wherein, Further comprises a wiring for inputting a reset signal, The flip-flop circuit is provided with a NOR gate or not gate, a transfer gate, and an inverter, One of the input terminals of the NAND gate is connected to the output terminal of the inverter, The other of the input terminals of the NAND gate is connected to the wiring, And outputting a light-emitting signal to the pixel circuit from an output terminal of the NAND gate.
8. The display device of claim 7, wherein, During a period in which the light-emitting power supply is rising, a reset signal input to the other of the input terminals of the NAND gate via the wiring is at a low level.

Description

Display device Cross Reference to Related Applications The present application is based on and claims priority from japanese patent application No. 2022-161675 filed on 6 th 10 th 2022, the entire contents of which are incorporated herein by reference. Technical Field Embodiments of the present invention relate to a display device. Background A reset circuit for resetting a shift register and a reset circuit for setting the potential of a liquid crystal layer of a display device to a predetermined potential have been developed. Disclosure of Invention The purpose of the present embodiment is to provide a display device that prevents unwanted light emission and improves display quality. A display device according to an embodiment includes: A plurality of pixels; pixel circuits respectively arranged on the pixels; A plurality of scan lines connected to the plurality of pixels; a plurality of signal lines connected to the plurality of pixels; a scanning line driving circuit connected to the plurality of scanning lines; a signal line driver circuit connected to the plurality of pixels; a shift register provided in the scanning line driving circuit; a plurality of flip-flop circuits provided in the shift register, and Reset elements respectively arranged on the trigger circuits, The reset element is an n-channel transistor, The pixel circuit includes a light-emitting element, a light-emitting power source, and a switching element, and the light-emitting element is disconnected from the light-emitting power source during a period in which the light-emitting power source is rising. In addition, a display device according to an embodiment includes: A plurality of pixels; pixel circuits respectively arranged on the pixels; A plurality of scan lines connected to the plurality of pixels; a plurality of signal lines connected to the plurality of pixels; a scanning line driving circuit connected to the plurality of scanning lines; a signal line driver circuit connected to the plurality of pixels; a shift register provided in the scanning line driving circuit; a plurality of flip-flop circuits provided in the shift register, and Reset elements respectively connected with the trigger circuits, The reset element is a NAND gate, The pixel circuit includes a light-emitting element, a light-emitting power source, and a switching element, and the light-emitting element is disconnected from the light-emitting power source during a period in which the light-emitting power source is rising. Drawings Fig. 1 is a plan view showing an example of a schematic configuration of a display device according to an embodiment. Fig. 2 is a circuit diagram showing a pixel circuit. Fig. 3 is a circuit diagram showing a pixel circuit. Fig. 4 is a circuit diagram showing a pixel circuit. Fig. 5 is a circuit diagram showing a pixel circuit. Fig. 6 is a circuit diagram showing the configuration of the shift register of the comparative example. Fig. 7 is a timing chart of the shift register of the comparative example. Fig. 8 is a timing chart showing a sequence of turning on the power supply to the pixel circuit of the comparative example. Fig. 9 is a block diagram showing a schematic configuration of a shift register that performs the operation of fig. 8. Fig. 10 is a circuit diagram showing the configuration of the shift register according to the embodiment. Fig. 11 is a timing chart of the shift register of the embodiment. Fig. 12 is a diagram showing a configuration example of a display device according to the embodiment. Fig. 13 is a timing chart of the shift register of configuration example 1. Detailed Description Hereinafter, embodiments of the present invention will be described with reference to the drawings. The disclosure is merely an example, and any suitable modification for keeping the gist of the present invention that can be easily recognized by those skilled in the art is certainly included in the scope of the present invention. In the drawings, for the sake of clarity of explanation, the width, thickness, shape, etc. of each portion are schematically shown as compared with the actual embodiment, but the explanation of the present invention is not limited thereto. In the present specification and the drawings, the same reference numerals are given to the same elements as those already described, and detailed description thereof may be omitted as appropriate. The embodiments described in the present specification are not general embodiments, but embodiments describing the same or corresponding specific technical features of the present invention. Hereinafter, a display device according to an embodiment will be described in detail with reference to the accompanying drawings. In the present embodiment, the first direction X, the second direction Y, and the third direction Z are orthogonal to each other, but may intersect at an angle other than 90 degrees. The direction of the front end of the arrow toward the third direction Z is defi