# US 11,908,386 B2 · Display apparatus

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- Number: US 11,908,386 B2
- Document ID: US11908386B2
- Status: Granted
- Kind: B2
- Application number: 17/894,623
- Filed: 2022-08-24
- Published: 2023-01-19
- Granted: 2024-02-20
- Earliest claimed: 2021-07-19
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Jinho Kim; Seungran Park; Donggun Oh; Jongsu Oh
- Web page: https://patentgrep.com/patent/US11908386B2

## CPC

- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- H05B 45/325: Pulse-width modulation [PWM]
- H05B 45/33: Pulse-amplitude modulation [PAM]
- H10W 90/00: Package configurations
- G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)}
- G09G 3/2014: {by modulation of the duration of a single pulse during which the logic level remains constant}
- 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
- G09G 2310/0251: Precharge or discharge of pixel before applying new pixel voltage
- G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
- G09G 2310/066: Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
- G09G 2320/0214: with crosstalk due to leakage current of pixel switch in active matrix panels
- G09G 2320/0223: Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0238: Improving the black level
- G09G 2320/0242: Compensation of deficiencies in the appearance of colours
- G09G 2320/0295: by monitoring each display pixel
- G09G 2320/064: by time modulation of the brightness of the illumination source
- G09G 2330/021: Power management, e.g. power saving
- G09G 2330/12: Test circuits or failure detection circuits included in a display system, as permanent part thereof
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A display apparatus, including a display panel which includes a pixel array including a plurality of pixels arranged in a plurality of row lines, and a plurality of sub-pixel circuits, wherein each pixel of the plurality of pixels includes a plurality of inorganic light emitting elements, and wherein each sub-pixel circuit of the plurality of sub-pixel circuits corresponds to an inorganic light emitting element of the plurality of light emitting elements; and a driver configured to drive the plurality of sub-pixel circuits so that the plurality of inorganic light emitting elements emit light a plurality of times in an order of the plurality of row lines based on an image data voltage corresponding to one image frame, wherein the each sub-pixel circuit includes a discharge transistor configured to remove a potential difference between both ends of a corresponding inorganic light emitting element based on a predetermined cycle.

## Claims

### Claim 1

A display apparatus comprising:
a display panel comprising a pixel array including a plurality of pixels arranged in a plurality of row lines, and a plurality of sub-pixel circuits, wherein each pixel of the plurality of pixels includes a plurality of inorganic light emitting elements, and wherein each sub-pixel circuit of the plurality of sub-pixel circuits corresponds to an inorganic light emitting element of the plurality of light emitting elements; and
a driver configured to drive the plurality of sub-pixel circuits so that the plurality of inorganic light emitting elements emit light a plurality of times in an order of the plurality of row lines based on an image data voltage corresponding to one image frame,
wherein the each sub-pixel circuit includes a discharge transistor configured to remove a potential difference between both ends of a corresponding inorganic light emitting element based on a predetermined cycle,
wherein the driver is further configured to:
during a data setting section that proceeds in the order of the plurality of row lines, set the image data voltage for the plurality of sub-pixel circuits in the order of the plurality of row lines, and
in each light emitting section of a plurality of light emitting sections that proceed in the order of the plurality of row lines, drive the plurality of sub-pixel circuits so that the plurality of inorganic light emitting elements emit the light in the order of the plurality of row lines based on the set image data voltage.

### Claim 2 (depends on 1)

The display apparatus of claim 1, wherein a first light emitting section from among the plurality of light emitting sections is temporally consecutive with the data setting section, and
wherein the plurality of light emitting sections have a predetermined time interval with respect to each other.

### Claim 3 (depends on 1)

The display apparatus of claim 1, wherein the discharge transistor is further configured to be turned on based on the predetermined cycle, and to short-circuit the both ends of the inorganic light emitting element while the discharge transistor is turned on.

### Claim 4 (depends on 3)

The display apparatus of claim 3, wherein the discharge transistor is further configured to be turned on at least once per image frame.

### Claim 5 (depends on 3)

The display apparatus of claim 3, wherein the discharge transistor is further configured to be turned on once per a plurality of image frames.

### Claim 6 (depends on 1)

The display apparatus of claim 1, wherein discharge transistors included in the display panel are turned on at once after the data setting section proceeds for all of the plurality of row lines of the display panel.

### Claim 7 (depends on 1)

The display apparatus of claim 1,
wherein the image data voltage comprises a constant current generator data voltage and a pulse width modulation (PWM) data voltage, and
wherein the each sub-pixel circuit comprises:
a constant current generator circuit comprising a first driving transistor, and configured to provide a constant current to the corresponding inorganic light emitting element based on the constant current generator data voltage; and
a PWM circuit comprising a second driving transistor, and configured to control a time during which the constant current is provided to the corresponding inorganic light emitting element based on a sweep voltage which sweeps between two different voltages and the PWM data voltage.

### Claim 8 (depends on 7)

The display apparatus of claim 7, wherein the constant current generator circuit is further configured to set, in the data setting section, the constant current generator data voltage and a first voltage based on a threshold voltage of the first driving transistor to a gate terminal of the first driving transistor, and
wherein the PWM circuit is further configured to set, in the data setting section, the PWM data voltage and a second voltage based on a threshold voltage of the second driving transistor to a gate terminal of the second driving transistor.

### Claim 9 (depends on 8)

The display apparatus of claim 8, wherein the constant current generator circuit is further configured to provide, in the each light emitting section, a driving current having a magnitude based on the first voltage to the inorganic light emitting element, and
wherein the PWM circuit is further configured to control, in the each light emitting section, the time during which the constant current is provided to the corresponding inorganic light emitting element based on a voltage of the gate terminal of the second driving transistor changing from the second voltage according to the sweep voltage.

### Claim 10 (depends on 7)

The display apparatus of claim 7, further comprising:
a sensing unit configured to sense currents flowing in the first driving transistor and the second driving transistor based on a specific voltage, and to output sensing data corresponding to the sensed currents; and
a correction unit configured to correct the constant current generator data voltage and the PWM data voltage applied to the plurality of sub-pixel circuits based on the sensing data.

### Claim 11 (depends on 1)

The display apparatus of claim 1, wherein the plurality of sub-pixel circuits are configured to be driven by a first driving voltage in the each light emitting section, and are further configured to be driven by a second driving voltage separate from the first driving voltage in the data setting section.

### Claim 12

A display apparatus comprising:
a display panel comprising a pixel array including a plurality of pixels arranged in a plurality of row lines, and a plurality of sub-pixel circuits, wherein each pixel of the plurality of pixels includes a plurality of inorganic light emitting elements, and wherein each sub-pixel circuit of the plurality of sub-pixel circuits corresponds to an inorganic light emitting element of the plurality of light emitting elements; and
a driver configured to drive the plurality of sub-pixel circuits so that the plurality of inorganic light emitting elements emit light a plurality of times in an order of the plurality of row lines based on an image data voltage corresponding to one image frame,
wherein the each sub-pixel circuit includes a discharge transistor configured to remove a potential difference between both ends of a corresponding inorganic light emitting element based on a predetermined cycle, and
wherein the potential difference is generated, based on the image data voltage being a value corresponding to a black gray scale, by a leakage current flowing in the inorganic light emitting element, and a junction capacitance of the inorganic light emitting element.