# US 12,112,679 B2 · Display device for reducing difference in brightness among subframes of light emitting elements forming one group

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,112,679 B2
- Document ID: US12112679B2
- Status: Granted
- Kind: B2
- Application number: 18/471,085
- Filed: 2023-09-20
- Published: 2024-06-27
- Granted: 2024-10-08
- Earliest claimed: 2022-12-22
- Assignees: TLI Inc.
- Applicants: TLI Inc.
- Inventors: Ju Hyun Park; Hwi Jeong Jo
- Web page: https://patentgrep.com/patent/US12112679B2

## CPC

- G09G 3/2022: {using sub-frames}
- G09G 2310/0264: Details of driving circuits
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- 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 including light emitting elements, scan lines, and channel lines, a scan driving part that transmits current to the channel lines, a data storage part that stores display data, and a pulse width modulating part that generates modulating signals.

## Claims

### Claim 1

A display device comprising:
a display panel including a 1-st to a 4-th light emitting element forming one group, a 1-st scan line and a 2-nd scan line adjacent to each other, and a 1-st channel line and a 2-nd channel line adjacent to each other, wherein the 1-st light emitting element is connected to the 1-st scan line and the 1-st channel line, the 2-nd light emitting element is connected to the 1-st scan line and the 2-nd channel line, the 3-rd light emitting element is connected to the 2-nd scan line and the 1-st channel line, and the 4-th light emitting element is connected to the 2-nd scan line and the 2-nd channel line, each of the 1-st to the 4-th light emitting element emits light with brightness according to a total amount of current flowing therein during a unit frame, the unit frame includes a 1-st to an n-th subframe which are sequentially progressed, and each of the 1-st to the n-th subframe includes ‘p’ number of a unit time, ‘n’ is a natural number greater than or equal to 2, and ‘p’ is a natural number greater than or equal to 1;
a scan driving part that is driven to selectively activate the 1-st scan line and the 2-nd scan line according to a scan address which is sequentially changed, wherein the 1-st scan line and the 2-nd scan line are activated non-overlappingly and sequentially in each of the 1-st to the n-th subframe;
a channel driving part that is driven to transmit current to flow in the 1-st channel line and the 2-nd channel line for a time corresponding to an activation width of a 1-st modulation signal and an activation width of a 2-nd modulation signal;
a data storage part that stores a 1-st to a 4-th display data corresponding to the 1-st to the 4-th light emitting element, wherein the 1-st display data and the 2-nd display data are sequentially output together with a channel address specifying corresponding 1-st and 2-nd channel line according to a generation of a 1-st scan address which is the scan address specifying the 1-st scan line, and the 3-rd display data and the 4-th display data are sequentially output together with a channel address specifying corresponding 1-st and 2-nd channel line according to a generation of a 2-nd scan address which is the scan address specifying the 2-nd scan line; and
a pulse width modulating part that is driven to generate a 1-st modulating signal and a 2-nd modulating signal by modulating the 1-st display data and the 2-nd display data provided from the data storage part according to the generation of the 1-st scan address, wherein the 1-st modulation signal is activated in the 1-st to the n-th subframe with an activation width corresponding to a 1-st distribution pattern of the 1-st display data in case that the 1-st scan address is generated, and the 2-nd modulation signal is activated in the 1-st to the n-th subframe with an activation width corresponding to a 2-nd distribution pattern of the 2-nd display data in case that the 1-st scan address is generated,
wherein the activation width of the 1-st modulation signal and the activation width of the 2-nd modulation signal are different from each other with respect to the 1-st display data and the 2-nd display data having a specific data value in a specific subframe that is at least one of the 1-st to the n-th subframe in case that the 1-st scan address is generated.

### Claim 2 (depends on 1)

The display device of claim 1, wherein with respect to the 1-st display data and the 2-nd display data having the specific data value in the specific subframe that is at least one of the 1-st to the n-th subframe in case that the 1-st scan address is generated
the activation width of the 1-st modulation signal corresponds to ‘a’ number of the unit time,
the activation width of the 2-nd modulation signal correspond to ‘a+r’ number of the unit time,
‘a’ is an integer in a range of 0 to (p-1), and
‘r’ is a natural number greater than or equal to 1.

### Claim 3 (depends on 2)

The display device of claim 2, wherein
the pulse width modulating part is driven to generate the 1-st modulating signal and the 2-nd modulating signal by modulating the 3-rd display data and the 4-th display data provided from the data storage part according to the generation of the 2-nd scan address,
the 1-st modulating signal is activated in the 1-st to the n-th subframe with an activation width corresponding to the 2-nd distribution pattern of the 3-rd display data in case that the 2-nd scan address is generated,
the 2-nd modulating signal is activated in the 1-st to the n-th subframe with an activation width corresponding to the 1-st distribution pattern of the 4-th display data in case that the 2-nd scan address is generated, and
the activation width of the 1-st modulation signal and the activation width of the 2-nd modulation signal are different from each other with respect to the 3-rd display data and the 4-th display data having the specific data value in the specific subframe in case that the 2-nd scan address is generated.

### Claim 4 (depends on 3)

The display device of claim 3, wherein with respect to the 3-rd display data and the 4-th display data having the specific data value in the specific subframe when the 2-nd scan address is generated
the activation width of the 1-st modulation signal corresponds to ‘a+r’ number of the unit time, and
the activation width of the 2-nd modulation signal corresponds to ‘a’ number of the unit time.

### Claim 5 (depends on 3)

The display device of claim 3, wherein the data storage part includes a SRAM that stores the 1-st to the 4-th display data provided from an outside.

### Claim 6

A display device comprising:
a display panel including a 1-st to a 4-th light emitting element forming one group, a 1-st scan line and a 2-nd scan line adjacent to each other, and a 1-st channel line and a 2-nd channel line adjacent to each other, wherein the 1-st light emitting element is connected to the 1-st scan line and the 1-st channel line, the 2-nd light emitting element is connected to the 1-st scan line and the 2-nd channel line, the 3-rd light emitting element is connected to the 2-nd scan line and the 1-st channel line, and the 4-th light emitting element is connected to the 2-nd scan line and the 2-nd channel line, each of the 1-st to the 4-th light emitting element emits light with brightness according to a total amount of current flowing therein during a unit frame, the unit frame includes a 1-st to an n-th subframe which are sequentially progressed, and each of the 1-st to the n-th subframe includes ‘p’ number of a unit time, ‘n’ is a natural number greater than or equal to 2, and ‘p’ is a natural number greater than or equal to 1;
a scan driving part that is driven to selectively activate the 1-st scan line and the 2-nd scan line according to a scan address which is sequentially changed, wherein the 1-st scan line and the 2-nd scan line are activated non-overlappingly and sequentially in each of the 1-st to the n-th subframe;
a channel driving part that is driven to transmit current to flow in the 1-st channel line and the 2-nd channel line for a time corresponding to an activation width of a 1-st modulation signal and an activation width of a 2-nd modulation signal;
a data storage part that stores a 1-st to a 4-th display data corresponding to the 1-st to the 4-th light emitting element, wherein the 1-st display data and the 2-nd display data are sequentially output together with a channel address specifying corresponding 1-st and 2-nd channel line according to a generation of a 1-st scan address which is the scan address specifying the 1-st scan line, and the 3-rd display data and the 4-th display data are sequentially output together with a channel address specifying corresponding 1-st and 2-nd channel line according to a generation of a 2-nd scan address which is the scan address specifying the 2-nd scan line; and
a pulse width modulating part that is driven to generate a 1-st modulating signal and a 2-nd modulating signal by modulating the 1-st display data and the 2-nd display data provided from the data storage part according to the generation of the 1-st scan address, and generate the 1-st modulating signal and the 2-nd modulating signal by modulating the 3-rd display data and the 4-th display data provided from the data storage part according to the generation of the 2-nd scan address, wherein
the 1-st modulation signal is activated in the 1-st to the n-th subframe with the activation width corresponding to a 1-st distribution pattern of the 1-st display data in case that the 1-st scan address is generated, and the activation width corresponding to a 2-nd distribution pattern of the 3-rd display data in case that the 2-nd scan address is generated, and
the activation width of the 1-st modulation signal in case that the 1-st scan address is generated and the activation width of the 1-st modulation signal in case that the 2-nd scan address is generated are different from each other with respect to the 1-st display data and the 3-rd display data having a specific data value in a specific subframe that is at least one of the 1-st to the n-th subframe.

### Claim 7 (depends on 6)

The display device of claim 6, wherein
the activation width of the 1-st modulation signal corresponds to ‘a’ number of the unit time with respect to the 1-st display data having the specific data value in the specific subframe in case that the 1-st scan address is generated,
the activation width of the 1-st modulation signal corresponds to ‘a+r’ number of the unit time with respect to the 3-rd display data having the specific data value in the specific subframe in case that the 2-nd scan address is generated,
‘a’ is an integer in a range of 0 to (p-1), and
‘r’ is a natural number greater than or equal to 1.