# US 10,504,445 B2 · Organic light emitting display panel having sub-pixels with different coupling capacitors

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- Number: US 10,504,445 B2
- Document ID: US10504445B2
- Status: Granted
- Kind: B2
- Application number: 16/056,453
- Filed: 2018-08-06
- Published: 2019-02-07
- Granted: 2019-12-10
- Earliest claimed: 2015-11-04
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Jung-Hoon Shim
- Web page: https://patentgrep.com/patent/US10504445B2

## CPC

- G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)}
- G09G 3/2018: {by time modulation using two or more time intervals}
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- H10K 59/1213: {the pixel elements being TFTs}
- H10K 59/1216: {the pixel elements being capacitors}
- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- H10K 59/352: {the areas of the RGB subpixels being different}
- H10K 59/353: {characterised by the geometrical arrangement of the RGB subpixels}
- G09G 3/3225: using an active matrix
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
- G09G 2300/0809: Several active elements per pixel in active matrix panels
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2300/0852: being a dynamic memory with more than 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 2300/0876: Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0242: Compensation of deficiencies in the appearance of colours
- G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements
- G09G 2320/0653: Controlling or limiting the speed of brightness adjustment of the illumination source
- 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)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic light emitting display panel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel for respectively emitting differently colored lights, each of the sub-pixels including a switching transistor connected to a data line, and having a gate electrode configured to receive a scan signal, a driving transistor connected to the switching transistor, an emission control transistor connected to the driving transistor, and having a gate electrode configured to receive an emission control signal, an emission control line connected to the gate electrode of the emission control transistor, an organic light emitting diode connected the emission control transistor, and coupling capacitor including a first electrode including a portion of the emission control line, and a second electrode including an anode of the organic light emitting diode overlapping the portion of the emission control line, wherein capacitances of a first capacitor including the coupling capacitor of the first sub-pixel and a second capacitor including the coupling capacitor of the second sub-pixel are greater than a capacitance of a third capacitor including the coupling capacitor of the third sub-pixel.

## Claims

### Claim 1

An organic light emitting display panel comprising a first sub-pixel, a second sub-pixel, and a third sub-pixel, each of the first and second sub-pixels comprising:
a switching transistor connected to a data line, and having a gate electrode configured to receive a scan signal;
a driving transistor connected to the switching transistor;
an emission control transistor connected to the driving transistor, and having a gate electrode configured to receive an emission control signal;
an emission control line of which a part is the gate electrode of the emission control transistor;
an organic light emitting diode electrically connected to the driving transistor through a via hole; and
a coupling capacitor comprising:
a first electrode comprising a portion of the emission control line; and
a second electrode comprising a first electrode layer of the organic light emitting diode overlapping the portion of the emission control line,
wherein capacitances of the coupling capacitors of the first and second sub-pixels are different.

### Claim 2 (depends on 1)

The panel of claim 1, wherein an entire width of the emission control line overlaps the second electrode of a first capacitor comprising the coupling capacitor of the first sub-pixel and the second electrode of a second capacitor comprising the coupling capacitor of the second sub-pixel.

### Claim 3 (depends on 1)

The panel of claim 1, wherein the first electrode further comprises at least a portion of the gate electrode of the emission control transistor.

### Claim 4 (depends on 1)

The panel of claim 1, wherein the first sub-pixel is configured to emit red color light,
wherein the second sub-pixel is configured to emit blue color light,
wherein the third sub-pixel is configured to emit green color light, and
wherein an emission efficiency of the third sub-pixel is higher than an emission efficiency of each of the first and second sub-pixels.

### Claim 5 (depends on 1)

The panel of claim 1, wherein the emission control transistor is configured to receive the emission control signal that swings between an inactive level and an active level during an emission period within a frame period, the emission period comprising a period in which the organic light emitting diode is configured to emit light.

### Claim 6 (depends on 5)

The panel of claim 5, wherein the coupling capacitor is configured to raise a voltage of an anode of the organic light emitting diode by coupling based on the emission control signal swing.

### Claim 7 (depends on 1)

The panel of claim 1, wherein each of the first and second sub-pixels further comprises a storage capacitor, the storage capacitor comprising:
a first electrode comprising a gate electrode of the driving transistor; and
a second electrode comprising a conductive pattern overlapping the first electrode of the storage capacitor.

### Claim 8 (depends on 7)

The panel of claim 7, wherein each of the first and second sub-pixels further comprises:
a compensation transistor connected to the driving transistor for compensating a threshold voltage of the driving transistor, and comprising a gate electrode configured to receive the scan signal.

### Claim 9 (depends on 8)

The panel of claim 8, wherein each of the first and second sub-pixels further comprises:
an initialization transistor connected to the gate electrode of the driving transistor, and comprising a gate electrode configured to receive an initialization signal to transmit an initialization voltage to the gate electrode of the driving transistor; and
a bypass transistor connected to an anode of the organic light emitting diode, and comprising a gate electrode configured to receive a bypass control signal to transmit the initialization voltage to the anode.

### Claim 10 (depends on 1)

The panel of claim 1, wherein the first through third sub-pixels are arranged in a pentile structure.

### Claim 11 (depends on 1)

The panel of claim 1, wherein the first through third sub-pixels are arranged in a stripe structure.