# US 2016/0260409 A1 · Display driving integrated circuit and display device including the same

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- Number: US 2016/0260409 A1
- Document ID: US20160260409A1
- Status: Published application
- Kind: A1
- Application number: 14/972,435
- Filed: 2015-12-17
- Published: 2016-09-08
- Earliest claimed: 2015-03-02
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: CHIAHSIN LIN; Chih-Yang LIAO; Jaeyeon KIM
- Web page: https://patentgrep.com/patent/US20160260409A1

## CPC

- G09G 5/006: {Details of the interface to the display terminal (specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04)}
- G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters}
- H02M 3/07: using capacitors charged and discharged alternately by semiconductor devices with control electrode {, e.g. charge pumps}
- H02M 3/073: {Charge pumps of the Schenkel-type}
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2310/0264: Details of driving circuits
- G09G 2310/0289: Details of voltage level shifters arranged for use in a driving circuit
- G09G 2330/021: Power management, e.g. power saving
- H02M 1/0032: {Control circuits allowing low power mode operation, e.g. in standby mode}
- H02M 3/075: {including a plurality of stages and two sets of clock signals, one set for the odd and one set for the even numbered stages}
- Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
- 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)
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A display driving integrated circuit is provided which drives a plurality of gate lines included in a display panel. The display driving integrated circuit includes: a charge pump configured to change a voltage from an external power source to generate an output voltage; and a gate line driver configured to drive the plurality of gate lines based on the output voltage. The charge pump may operate in one of a low-current mode and a high-current mode based on a size of the display panel.

## Claims

### Claim 1

A display driving integrated circuit comprising:
a charge pump configured to change a voltage from an external power source to generate an output voltage; and
a gate line driver configured to drive a plurality of gate lines included in a display panel based on the output voltage,
wherein the charge pump operates in one of a low-current mode and a high-current mode based on a size of the display panel.

### Claim 2 (depends on 1)

The display driving integrated circuit of claim 1, further comprising:
a signal generator configured to generate a first switching signal and a second switching signal a phase of which is opposite to a phase of the first switching signal, and
wherein the charge pump generates the output voltage in response to the first and second switching signals.

### Claim 3 (depends on 2)

The display driving integrated circuit of claim 2, wherein the charge pump comprises:
a mode switch configured to operate in response to the first and second switching signals;
a control switch configured to operate in response to the first and second switching signals; and
an output circuit configured to output the output voltage based on operations of the mode switch and the control switch,
wherein the mode switch is enabled or disabled according to the low-current mode or the high-current mode.

### Claim 4 (depends on 3)

The display driving integrated circuit of claim 3, wherein the output circuit comprises first, second, and third diodes and first, second, and third capacitors,
wherein an input terminal of the first diode receives a first voltage from the external power source and an output terminal thereof is connected to an input terminal of the second diode,
wherein an output terminal of the second diode is connected to an input terminal of the third diode,
wherein an output terminal of the third diode is connected to a first node for outputting the output voltage,
wherein one end of the first capacitor is connected to the output terminal of the first diode and the mode switch and the other end thereof is connected to the control switch,
wherein one end of the second capacitor is connected to the output terminal of the second diode and the mode switch and the other end thereof is connected to the control switch, and
wherein one end of the third capacitor is connected to the first node and the other end thereof is grounded.

### Claim 5 (depends on 4)

The display driving integrated circuit of claim 4, wherein each of the first and second capacitors is connected to the mode switch and the control switch through at least one transparent electrode.

### Claim 6 (depends on 4)

The display driving integrated circuit of claim 4, wherein the control switch comprises:
first and third control switches operating in response to the first switching signal and second and fourth control switches operating in response to the second switching signal,
wherein an input terminal of the first control switch receives a third voltage from the external power source and an output terminal thereof is connected to the other end of the first capacitor,
wherein an input terminal of the second control switch receives the first voltage and an output terminal thereof is connected to the other end of the first capacitor,
wherein an input terminal of the third control switch receives the first voltage and an output terminal thereof is connected to the other end of the second capacitor, and
wherein an input terminal of the fourth control switch receives a second voltage from the external power and an output terminal thereof is connected to the other end of the second capacitor.

### Claim 7 (depends on 4)

The display driving integrated circuit of claim 4, wherein the mode switch comprises:
first and third mode switches operating in response to the first switching signal and a second mode switch operating in response to the second switching signal,
wherein an input terminal of the first mode switch receives the first voltage and an output terminal thereof is connected to the one end of the first capacitor and an input terminal of the second mode switch,
wherein an output terminal of the second mode switch is connected to the one end of the second capacitor and an input terminal of the third mode switch, and
wherein an output terminal of the third mode switch is connected to the first node.

### Claim 8 (depends on 7)

The display driving integrated circuit of claim 7, wherein the first to third mode switches are disabled when the charge pump operates in the high-current mode and are enabled when the charge pump operates in the low-current mode.

### Claim 9 (depends on 1)

The display driving integrated circuit of claim 1, wherein the charge pump operates in the high-current mode when a level of a driving current of the display panel is higher than a predetermined level and operates in the low-current mode when a level of the driving current of the display panel is lower than the predetermined level.

### Claim 10 (depends on 1)

The display driving integrated circuit of claim 1, further comprising:
a plurality of data line drivers configured to drive a plurality of data lines included in the display panel; and
a logic circuit configured to control the gate line driver and the plurality of data line drivers according to a control of an external device.

### Claim 11 (depends on 1)

A display device comprising:
the display driving integrated circuit of claim 1;
the display panel comprising the plurality of gate lines, a plurality of data lines, and a plurality of pixels connected to the plurality of gate lines and the plurality of data lines; and
a flexible printed circuit connected to the display driving integrated circuit through a plurality of transparent electrodes provided on the display panel and comprising an output circuit configured to provide the display driving integrated circuit with a driving voltage,
wherein the display driving integrated circuit includes a mode switch and a control switch that operate in one of a low-current mode and a high-current mode according to a size of the display panel and control the output portion.

### Claim 12 (depends on 11)

The display device of claim 11, wherein the mode switch is disabled in the low-current mode and is enabled in the high-current mode.

### Claim 13 (depends on 11)

The display device of claim 11, wherein the output circuit comprises first, second, and third diodes and first, second, and third capacitors,
wherein an input terminal of the first diode receives a first voltage and an output terminal thereof is connected to an input terminal of the second diode,
wherein an output terminal of the second diode is connected to an input terminal of the third diode,
wherein an output terminal of the third diode is connected to a first node for outputting the output voltage,
wherein one end of the first capacitor is connected to the output terminal of the first diode and is connected to the mode switch through one of the plurality of transparent electrodes and the other end thereof is connected to the control switch,
wherein one end of the second capacitor is connected to the output terminal of the second diode and is connected to the mode switch through one of the plurality of transparent electrodes and the other end thereof is connected to the control switch, and
wherein one end of the third capacitor is connected to the first node and the other end thereof is grounded.

### Claim 14 (depends on 13)

The display device of claim 13, wherein the mode switch comprises:
first and third mode switches operating in response to the first switching signal and a second mode switch operating in response to the second switching signal,
wherein an input terminal of the first mode switch receives the first voltage and an output terminal thereof is connected to the one end of the first capacitor and an input terminal of the second mode switch,
wherein an output terminal of the second mode switch is connected to an input terminal of the third mode switch and with the one end of the second capacitor through one of the plurality of transparent electrodes, and
wherein an output terminal of the third mode switch is connected to the first node through one of the plurality of transparent electrodes.

### Claim 15 (depends on 14)

The display device of claim 14, wherein the control switch comprises:
first and third control switches operating in response to the first switching signal and second and fourth control switches operating in response to the second switching signal,
wherein an input terminal of the first control switch receives a third voltage and an output terminal thereof is connected to the other end of the first capacitor through one of the plurality of transparent electrodes,
wherein an input terminal of the second control switch receives the first voltage and an output terminal thereof is connected to the other end of the first capacitor through one of the plurality of transparent electrodes,
wherein an input terminal of the third control switch receives the first voltage and an output terminal thereof is connected to the other end of the second capacitor through one of the plurality of transparent electrodes, and
wherein an input terminal of the fourth control switch receives the second voltage and an output terminal thereof is connected to the other end of the second capacitor through one of the plurality of transparent electrodes.

### Claim 16

A display driving integrated circuit comprising:
a charge pump comprising at least one switch and at least one capacitor,
wherein the charge pump is configured to change a given voltage to generate an output voltage provided to a driver of a display panel, according to a mode of the display panel, and
wherein the mode of the display panel comprises a low-current mode and a high-current mode which is determined by an amount of current required to drive the display panel.

### Claim 17 (depends on 16)

The display driving integrated circuit of claim 16, wherein the charge pump is configured to receive a first switching signal and a second switching signal a phase of which is opposite to a phase of the first switching signal, and generate the output voltage in response to the first and second switching signals.

### Claim 18 (depends on 17)

The display driving integrated circuit of claim 17, wherein the charge pump is configured to charge the given voltage during a first time period and increase the given voltage to the output voltage during a second time period.

### Claim 19 (depends on 16)

The display driving integrated circuit of claim 16, wherein the given voltage is a voltage charged in the at least one capacitor, and is lower than an input voltage provided from an outside power source by an amount of a voltage dropped by a parasitic resistance of the display panel.

### Claim 20 (depends on 16)

The display driving integrated circuit of claim 16, wherein, in either of the low-current mode and the high-current mode, the charge pump is configured to use the same at least one switch and the same at least one capacitor to generate the output voltage.