# US 12,223,877 B2 · Display panel and display apparatus

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- Number: US 12,223,877 B2
- Document ID: US12223877B2
- Status: Granted
- Kind: B2
- Application number: 18/213,066
- Filed: 2023-06-22
- Published: 2024-07-04
- Granted: 2025-02-11
- Earliest claimed: 2022-12-30
- Assignees: Seeya Optronics Co., Ltd.
- Applicants: Seeya Optronics Co., Ltd.
- Inventors: Jialing Li; Yongcai Shen; Liyuan Luo; Qi Li
- Web page: https://patentgrep.com/patent/US12223877B2

## CPC

- G09G 3/2074: {using sub-pixels}
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- G09G 2300/0443: with several sub-pixels for the same colour in a pixel, not specifically used to display gradations (G09G3/364 takes precedence)
- G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
- G09G 2300/0465: Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
- G09G 2300/0804: Sub-multiplexed active matrix panel, i.e. wherein one active driving circuit is used at pixel level for multiple image producing elements
- 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 2310/08: Details of timing specific for flat panels, other than clock recovery
- G09G 2320/0666: for control of colour parameters, e.g. colour temperature
- H05B 45/60: Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
- 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

## Abstract

Provided are a display panel and a display apparatus. The display panel includes M pixel driving circuits and N sub-pixel units, where M<N, and M and N are each a positive integer. The M pixel driving circuits are configured to drive the N sub-pixel units to emit light. According to the technical solutions, the number of pixel driving circuits is reduced, pixels per inch of the display panel are beneficial to improve, and the display resolution is improved. Moreover, the number of pixel driving circuits does not need to be increased while the number of the sub-pixel units is increased, thereby reducing the cost.

## Claims

### Claim 1

A display panel comprising M pixel driving circuits and N sub-pixel units, wherein M<N, and M and N are each a positive integer; and
the M pixel driving circuits are configured to drive the N sub-pixel units to emit light;
wherein one of the following is satisfied:
the N sub-pixel units have a same emission color, each of the M pixel driving circuits comprises a driving transistor, the driving transistor comprises an n-channel thin-film transistor, and two of the M pixel driving circuits are configured to drive different numbers of sub-pixel units among the N sub-pixel units, wherein among the M pixel driving circuits, an output terminal of a driving transistor of one pixel driving circuit is electrically connected to N−M+1 sub-pixel units of the N sub-pixel units, and an output terminal of a driving transistor of each of other pixel driving circuits is electrically connected to one of the N sub-pixel units;
emission colors of the N sub-pixel units are same, each of the M pixel driving circuits comprises a driving transistor, the driving transistor comprises a p-channel thin-film transistor, and the M pixel driving circuits comprise an i-th pixel driving circuit and an j-th pixel driving circuit, wherein 1≤i≤M, 1≤j≤M, and i≠j, wherein a difference ΔI between a driving current I1 output from the i-th pixel driving circuit and a driving current I2 output from the j-th pixel driving circuit satisfies ΔI/((I1+I2)/2)≤20%; or
the N sub-pixel units comprise N1 first sub-pixel units and N2 second sub-pixel units, and an emission color of the first sub-pixel units is different from an emission color of the second sub-pixel units, wherein N1 and N2 are each a positive integer and N1+N2≤N, and among the M pixel driving circuits, M1 pixel driving circuits are configured to drive the N1 first sub-pixel units to emit light, M2 pixel driving circuits are configured to drive the N2 second sub-pixel units to emit light, wherein M1 and M2 are each a positive integer, and M1+M2≤M, wherein N1/M1<N2/M2.

### Claim 2 (depends on 1)

The display panel according to claim 1, wherein output terminals of driving transistors of any two of the M pixel driving circuits are electrically connected to a same number of sub-pixel units, and the number is greater than one.

### Claim 3 (depends on 1)

The display panel according to claim 1, wherein a sum of target luminance of a set number of first sub-pixel units of the N1 first sub-pixel units is greater than a sum of target luminance of the set number of second sub-pixel units of the N2 second sub-pixel units.

### Claim 4 (depends on 1)

The display panel according to claim 1, wherein light-emitting efficiency of each of the N1 first sub-pixel units is less than light-emitting efficiency of each of the N2 second sub-pixel units.

### Claim 5 (depends on 1)

The display panel according to claim 1, wherein, under any two adjacent display gray levels, a difference of driving signals corresponding to the first sub-pixel units is less than a difference of driving signals corresponding to the second sub-pixel units, wherein
the driving signals comprise driving voltages or driving currents.

### Claim 6 (depends on 1)

The display panel according to claim 1, comprising a plurality of pixel unit groups, wherein each of the plurality of pixel unit groups comprises a plurality of sub-pixel units of the N sub-pixel units;
in a case where each of the M pixel driving circuits comprises the driving transistor, and the driving transistor comprises the n-channel thin-film transistor; and
in a same pixel unit group of the plurality of pixel unit groups, when a difference between a maximum driving voltage of the plurality of sub-pixel units and a minimum driving voltage of the plurality of sub-pixel units is less than or equal to 5 V under any display gray level,
the pixel unit group is driven to emit light by a same pixel driving circuit of the M pixel driving circuits.

### Claim 7 (depends on 6)

The display panel according to claim 6, wherein two adjacent sub-pixel units of the plurality of sub-pixel units are a third sub-pixel unit and a fourth sub-pixel unit, respectively;
the pixel driving circuit comprises a first pixel driving circuit and a second pixel driving circuit, wherein an output terminal of the first pixel driving circuit is electrically connected to the third sub-pixel unit through a voltage divider module, and an output terminal of the second pixel driving circuit is electrically connected to the fourth sub-pixel unit; and
when a voltage difference across the voltage divider module is less than or equal to 5 V, the first pixel driving circuit is reused as the second pixel driving circuit.

### Claim 8 (depends on 7)

The display panel according to claim 7, wherein the voltage divider module comprises a diode or an adjustable resistor.

### Claim 9 (depends on 1)

The display panel according to claim 1, wherein each of the M pixel driving circuits comprises a driving transistor, a data writing module, a light emitting control module, and a storage module, wherein
the data writing module is electrically connected to a gate of the driving transistor to write a data signal to the driving transistor;
the light emitting control module is configured to control the driving transistor to supply a driving signal to at least one sub-pixel unit of the N sub-pixel units; and
the storage module is configured to store the data signal written to the gate of the driving transistor.

### Claim 10 (depends on 9)

The display panel according to claim 9, wherein the data writing module comprises a first writing transistor and a second writing transistor, wherein a channel type of the first writing transistor is different from a channel type of the second writing transistor; and a first terminal of the first writing transistor and a first terminal of the second writing transistor are electrically connected to a data signal terminal, a second terminal of the first writing transistor and a second terminal of the second writing transistor are electrically connected to the gate of the driving transistor, a gate of the first writing transistor is electrically connected to a first scan signal terminal, and a gate of the second writing transistor is electrically connected to a second scan signal terminal;
the light emitting control module comprises a light emitting control transistor, wherein a first terminal of the light emitting control transistor is electrically connected to a second terminal of the driving transistor, a second terminal of the light emitting control transistor is electrically connected to the at least one sub-pixel unit of the N sub-pixel units, and a gate of the light emitting control transistor is electrically connected to a light emitting control signal terminal; and
the storage module comprises a storage capacitor, wherein a first plate of the storage capacitor is electrically connected to a first power supply terminal, and a second plate of the storage capacitor is electrically connected to the gate of the driving transistor.

### Claim 11

A display apparatus, comprising a display panel, wherein the display panel comprises M pixel driving circuits and N sub-pixel units, wherein M<N, and M and N are each a positive integer; and
the M pixel driving circuits are configured to drive the N sub-pixel units to emit light;
wherein one of the following is satisfied:
the N sub-pixel units have a same emission color, each of the M pixel driving circuits comprises a driving transistor, the driving transistor comprises an n-channel thin-film transistor, and two of the M pixel driving circuits are configured to drive different numbers of sub-pixel units among the N sub-pixel units, wherein among the M pixel driving circuits, an output terminal of a driving transistor of one pixel driving circuit is electrically connected to N−M+1 sub-pixel units of the N sub-pixel units, and an output terminal of a driving transistor of each of other pixel driving circuits is electrically connected to one of the N sub-pixel units;
emission colors of the N sub-pixel units are same, each of the M pixel driving circuits comprises a driving transistor, the driving transistor comprises a p-channel thin-film transistor, and the M pixel driving circuits comprise an i-th pixel driving circuit and an j-th pixel driving circuit, wherein 1≤i≤M, 1≤j≤M, and i≠j, wherein a difference ΔI between a driving current I1 output from the i-th pixel driving circuit and a driving current I2 output from the j-th pixel driving circuit satisfies ΔI/((I1+I2)/2)≤20%; or
the N sub-pixel units comprise N1 first sub-pixel units and N2 second sub-pixel units, and an emission color of the first sub-pixel units is different from an emission color of the second sub-pixel units, wherein N1 and N2 are each a positive integer and N1+N2≤N, and among the M pixel driving circuits, M1 pixel driving circuits are configured to drive the N1 first sub-pixel units to emit light, M2 pixel driving circuits are configured to drive the N2 second sub-pixel units to emit light, wherein M1 and M2 are each a positive integer, and M1+M2≤M, wherein N1/M1<N2/M2.