# US 11,443,679 B1 · Display device and display method

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- Number: US 11,443,679 B1
- Document ID: US11443679B1
- Status: Granted
- Kind: B1
- Application number: 17/401,289
- Filed: 2021-08-12
- Published: 2022-09-08
- Granted: 2022-09-13
- Earliest claimed: 2021-03-05
- Assignees: Au Optronics Corporation
- Applicants: Au Optronics Corporation
- Inventors: Pei-Fen Lai; Hung-Chi Wang; Ya-Fang Chen; Chih-Hsiang Yang
- Web page: https://patentgrep.com/patent/US11443679B1

## CPC

- G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)}
- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- G09G 5/10: Intensity circuits
- G09G 2320/0242: Compensation of deficiencies in the appearance of colours
- G09G 2320/029: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
- G09G 2320/041: Temperature compensation
- G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements
- G09G 2320/064: by time modulation of the brightness of the illumination source
- G09G 2330/12: Test circuits or failure detection circuits included in a display system, as permanent part thereof
- G09G 2360/14: Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G 2360/141: the light conveying information used for selecting or modulating the light emitting or modulating element
- G09G 2360/147: the originated light output being determined for each pixel
- G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data
- 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 and a display method are provided. The display device includes a board, a sensing circuit, and a feedback control circuit. The board includes a display array formed by a plurality of pixels. The sensing circuit includes a test pixel and a light sensor. The light sensor receives light emitted by the test pixel to generate a corresponding sensing signal. The feedback control circuit receives the sensing signal and generates a pulse width adjusting signal to adjust a pulse width at which the pixels are operated for display.

## Claims

### Claim 1

A display device comprising:
a first board comprising a display array formed by a plurality of pixels;
a sensing circuit comprising a test pixel and a light sensor, wherein the light sensor receives light emitted by the test pixel to generate a corresponding sensing signal; and
a feedback control circuit receiving the sensing signal and generating a pulse width adjusting signal to adjust a pulse width at which the pixels are operated for display,
wherein the feedback control circuit comprises:
an arithmetic circuit coupled to the sensing circuit, wherein the arithmetic circuit calculates a brightness decay value according to the sensing signal and reference brightness information;
a pulse width compensation circuit coupled to the arithmetic circuit, wherein the pulse width compensation circuit calculates the pulse width adjusting signal according to the brightness decay value;
an interface circuit coupled to the sensing circuit, wherein the interface circuit receives the sensing signal;
a filter coupled to the interface circuit, wherein the filter filters out noise in the sensing signal;
an analog-to-digital converter coupled between the filter and the arithmetic circuit, wherein the analog-to-digital converter provides the filtered sensing signal to the arithmetic circuit for calculation; and
a transceiver coupled to the pulse width compensation circuit, the arithmetic circuit, and a microcontroller, wherein the transceiver provides the pulse width adjusting signal calculated by the pulse width compensation circuit to the microcontroller, and the transceiver receives the reference brightness information from the microcontroller and provides the reference brightness information to the arithmetic circuit.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the light sensor receives light of a first color emitted by the test pixel to generate the corresponding sensing signal, and the feedback control circuit receives the sensing signal to accordingly adjust the pulse width at which the pixels are operated for displaying the first color.

### Claim 3 (depends on 1)

The display device according to claim 1, wherein the feedback control circuit further senses a driving current configured to drive the display array to adjust the pulse width at which the pixels are operated for display.

### Claim 4 (depends on 1)

The display device according to claim 1, further comprising a second board, and the second board comprises the microcontroller configured to drive the display array,
wherein the sensing circuit is disposed on the first board or the second board.

### Claim 5 (depends on 4)

The display device according to claim 4, wherein the feedback control circuit provides the pulse width adjusting signal to the microcontroller in a vertical blank interval in a frame time.

### Claim 6 (depends on 4)

The display device according to claim 4, wherein the first board and the second board are disposed in parallel to each other, the test pixel and the light sensor of the sensing circuit are disposed on two surfaces, which face each other, of the first board and the second board, and a configuration position of the test pixel corresponds to a configuration position of the light sensor.

### Claim 7

A display method comprising:
providing a display array formed by a plurality of pixels to perform display;
providing a sensing circuit, and receiving, by a light sensor of the sensing circuit, light emitted by a test pixel of the sensing circuit to generate a corresponding sensing signal; and
receiving, by a feedback control circuit, the sensing signal and generating a pulse width adjusting signal to adjust a pulse width at which the pixels are operated for display,
wherein the feedback control circuit comprises:
an arithmetic circuit coupled to the sensing circuit, wherein the arithmetic circuit calculates a brightness decay value according to the sensing signal and reference brightness information;
a pulse width compensation circuit coupled to the arithmetic circuit, wherein the pulse width compensation circuit calculates the pulse width adjusting signal according to the brightness decay value;
an interface circuit coupled to the sensing circuit, wherein the interface circuit receives the sensing signal;
a filter coupled to the interface circuit, wherein the filter filters out noise in the sensing signal;
an analog-to-digital converter coupled between the filter and the arithmetic circuit, wherein the analog-to-digital converter provides the filtered sensing signal to the arithmetic circuit for calculation; and
a transceiver coupled to the pulse width compensation circuit, the arithmetic circuit, and a microcontroller, wherein the transceiver provides the pulse width adjusting signal calculated by the pulse width compensation circuit to the microcontroller, and the transceiver receives the reference brightness information from the microcontroller and provides the reference brightness information to the arithmetic circuit.

### Claim 8 (depends on 7)

The display method according to claim 7, further comprising:
sensing, by the feedback control circuit, a driving current configured to drive the display array to adjust the pulse width at which the pixels are operated for display.