# US 12,008,961 B2 · Display device and electronic apparatus including the same

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- Number: US 12,008,961 B2
- Document ID: US12008961B2
- Status: Granted
- Kind: B2
- Application number: 18/119,513
- Filed: 2023-03-09
- Published: 2024-01-18
- Granted: 2024-06-11
- Earliest claimed: 2022-07-13
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Moonsang Hwang
- Web page: https://patentgrep.com/patent/US12008961B2

## CPC

- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/3266: Details of drivers for scan electrodes
- G09G 3/3275: Details of drivers for data electrodes
- G09G 3/3291: in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
- G09G 2300/0439: Pixel structures
- G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- 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 2310/0248: Precharge or discharge of column electrodes before or after applying exact column voltages
- G09G 2310/0251: Precharge or discharge of pixel before applying new pixel voltage
- G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit
- G09G 2310/0297: Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0285: using tables for spatial correction of display data
- G09G 2340/0435: Change or adaptation of the frame rate of the video stream
- G09G 2360/14: Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- 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)

## Abstract

A display device includes: a display panel which includes a plurality of display areas having different pixel densities from each other, where each of the display areas includes a plurality of pixels; a gate driver, which provides a first gate signal and a second gate signal to each of the pixels; and a data driver, which provides data voltages to the pixels in an address-scan period and provides different bias voltages to the display areas, respectively, in a self-scan period following the address-scan period.

## Claims

### Claim 1

A display device, comprising:
a display panel, which includes a plurality of display areas having different pixel densities from each other, wherein each of the display areas includes a plurality of pixels;
a gate driver, which provides a first gate signal and a second gate signal to each of the pixels; and
a data driver, which provides data voltages to the pixels in an address-scan period and provides different bias voltages to the display areas, respectively, in a self-scan period following the address-scan period.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the display panel further includes data lines, which connect the pixels to the data driver, apply the data voltages to the pixels in the address-scan period, and apply the bias voltages to the pixels in the self-scan period.

### Claim 3 (depends on 2)

The display device of claim 2, wherein the data driver includes:
a memory, which stores image data corresponding to the data voltages;
a look-up table, which stores position information of the display areas and values of the bias voltages of the display areas corresponding to the bias voltages;
a bias determiner, which determines bias data from the look-up table;
a multiplexer, which selects the image data as output data in the address-scan period and selects the bias data as the output data in the self-scan period;
a digital-to-analog converter, which converts the output data into data signals; and
buffers, which output the data signals to the data lines, respectively.

### Claim 4 (depends on 3)

The display device of claim 3, wherein the look-up table includes:
a display area position look-up table, which stores the position information of the display areas; and
a bias voltage look-up table, which stores the values of the bias voltages of the display areas.

### Claim 5 (depends on 4)

The display device of claim 4, wherein the position information of the display areas includes shapes of the display areas, sizes of the display areas, and points of the display areas.

### Claim 6 (depends on 4)

The display device of claim 4, wherein the values of the bias voltages of the display areas include red values of the bias voltages with respect to a red pixel of the pixels, green values of the bias voltages with respect to a green pixel of the pixels, and blue values of the bias voltages with respect to a blue pixel of the pixels.

### Claim 7 (depends on 3)

The display device of claim 3, wherein the data driver further includes a bias current controller, which controls a magnitude of a bias current provided to the buffers based on a change in the bias voltages provided to pixel rows of the pixels.

### Claim 8 (depends on 7)

The display device of claim 7, wherein the bias current controller provides a first bias current to the buffers when the bias voltages provided to a current pixel row of the pixel rows are the same as the bias voltages provided to a previous pixel row of the pixel rows, and provides a second bias current greater than the first bias current to the buffers when the bias voltages provided to the current pixel row are different from the bias voltages provided to the previous pixel row.

### Claim 9 (depends on 2)

The display device of claim 2, wherein at least one of the pixels includes:
a light emitting diode;
a driving transistor, which provides a driving current to the light emitting diode; and
a write transistor connected between a first electrode of the driving transistor and one of the data lines, and turned on in response to the first gate signal.

### Claim 10 (depends on 9)

The display device of claim 9, wherein the write transistor provides one of the data voltages to a gate electrode of the driving transistor in response to the first gate signal in the address-scan period, and provides one of the bias voltages to the first electrode of the driving transistor in response to the first gate signal in the self-scan period.

### Claim 11 (depends on 9)

The display device of claim 9, wherein the at least one of the pixels further includes a bias transistor connected between the first electrode of the driving transistor and the one of the data lines, and turned on in response to the second gate signal.

### Claim 12 (depends on 11)

The display device of claim 11, wherein the write transistor provides one of the data voltages to a gate electrode of the driving transistor in response to the first gate signal in the address-scan period, and
wherein the bias transistor provides one of the bias voltages to the first electrode of the driving transistor in response to the second gate signal in the self-scan period.

### Claim 13

A display device, comprising:
a display panel, which includes a first display area having a first pixel density and including a plurality of first pixels and a second display area having a second pixel density lower than the first pixel density and including a plurality of second pixels;
a gate driver, which provides a first gate signal and a second gate signal to each of the first and second pixels; and
a data driver, which provides data voltages to the first and second pixels in an address-scan period and provides a first bias voltage and a second bias voltage different from the first bias voltage to the first display area and the second display area, respectively, in a self-scan period following the address-scan period.

### Claim 14 (depends on 13)

The display device of claim 13, wherein the second display area further includes at least one transmitting portion, which transmits external light incident onto the display panel.

### Claim 15 (depends on 13)

The display device of claim 13, wherein the display panel further includes a third display area having a third pixel density lower than the first pixel density, spaced apart from the second display area, and including a plurality of third pixels.

### Claim 16 (depends on 13)

The display device of claim 13, wherein the display panel further includes data lines, which connect the first and second pixels to the data driver, apply the data voltages to the first and second pixels in the address-scan period, and apply the first bias voltage and the second bias voltage to the first pixels and the second pixels, respectively, in the self-scan period.

### Claim 17 (depends on 16)

The display device of claim 16, wherein the data driver includes:
a memory, which stores image data corresponding to the data voltages;
a look-up table, which stores position information of the first display area, position information of the second display area, a first bias voltage value corresponding to the first bias voltage, and a second bias voltage value corresponding to the second bias voltage;
a bias determiner, which determines bias data from the look-up table;
a multiplexer, which selects the image data as output data in the address-scan period and selects the bias data as the output data in the self-scan period;
a digital-to-analog converter, which converts the output data into data signals; and
buffers, which output the data signals to the data lines, respectively.

### Claim 18

An electronic apparatus, comprising:
a display device, which displays an image; and
an optical device, which overlaps the display device and detects external light incident onto the display device,
wherein the display device includes:
a display panel, which includes a first display area having a first pixel density and including a plurality of first pixels and a second display area having a second pixel density lower than the first pixel density and including a plurality of second pixels;
a gate driver, which provides a first gate signal and a second gate signal to each of the first and second pixels; and
a data driver, which provides data voltages to the first and second pixels in an address-scan period and provides a first bias voltage and a second bias voltage different from the first bias voltage to the first display area and the second display area, respectively, in a self-scan period following the address-scan period.

### Claim 19 (depends on 18)

The electronic apparatus of claim 18, wherein the optical device overlaps the second display area.

### Claim 20 (depends on 18)

The electronic apparatus of claim 18, wherein the optical device includes at least one of a camera module and a light sensor module.