Display driver integrated circuit and electronic apparatus including the same

Patent metadata

Field	Value
Publication number	US-10067595-B2
Application number	US-201615160310-A
Country	US
Kind code	B2
Filing date	May 20, 2016
Priority date	Aug 7, 2015
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

A display driver integrated circuit (IC) and an electronic apparatus including the same are provided. The display driver IC includes a booster configured to boost an external power supply voltage applied to a first node to a same level as that of an internal power supply voltage, and a power supplier including a power level adjustor configured to activate a current path between a second node and ground in response to a control signal indicating entry into a first mode and form a current path between the first node and the second node when the internal power supply voltage at the second node is equal to a reference voltage.

First claim

What is claimed is:

1. A display driver integrated circuit (IC) comprising:
a booster configured to boost an external power supply voltage applied to a first node to a voltage level of an internal power supply voltage applied to a second node, the external power supply voltage being a positive power supply voltage, and the internal power supply voltage being a gate high voltage; and
a power level adjustor configured to,
form a current path between the second node and a ground, in response to the display driver IC entering a first mode,
deactivate the current path between the second node and ground and form a current path between the first node and the second node, in response to the internal power supply voltage at the second node being equal to a reference voltage, wherein

the power level adjustor includes,
a first PMOS transistor having a source, a drain and a gate, the source of the first PMOS transistor connected to the second node and the gate of the first PMOS transistor configured to receive a control signal,
a second PMOS transistor having a source, a drain and a gate, the source of the second PMOS transistor connected to the drain of the first PMOS transistor, the drain of the second PMOS transistor connected to the ground, and the gate of the second PMOS transistor configured to receive a first voltage,
a first current source connected to the second node, the first current source configured to supply a current having a first current level,
a third PMOS transistor connected between the first current source and a third node, the third PMOS transistor having a gate configured to receive the first voltage,
a second current source connected between the third node and the ground, the second current source configured to supply a current having a second current level, the second current level being less than the first current level, and
a fourth PMOS transistor connected between the first node and the second node, the fourth PMOS transistor having a gate configured to receive an enable signal from the third node.

2. The display driver IC of claim 1 , wherein the power level adjustor comprises:
a first current path configured to electrically connect the second node to the ground, in response to the control signal indicating that the display driver IC has entered the first mode;
an internal power level detector configured to detect the internal power supply voltage at the second node, and selectively output the enable signal based on the detected internal power supply voltage and the reference voltage; and
a second current path configured to electrically connect the first node to the second node, in response to the internal power level detector outputting the enable signal.

3. The display driver IC of claim 2 , wherein the first voltage is the positive power supply voltage, and the reference voltage is greater than the positive power supply voltage by a threshold voltage of the third PMOS transistor.

4. The display driver IC of claim 1 , wherein the first mode is an operation mode other than a normal mode for image data processing.

5. An electronic apparatus comprising:
an in-cell type touch panel including at least one display pixel and at least one touch pixel;
a power management IC (PMIC) configured to generate an external power supply voltage, and to apply the external power supply voltage to a first node; and
a display driver integrated circuit (IC) configured to drive the in-cell type touch panel, the display driver IC including a power supplier configured to,
activate a first current path connecting the first node to ground, in response to the display driver IC entering a first mode,
deactivate the first current path between the first node and the ground and activate a second current path connecting the first node to a second node after deactivating the first current path in response to an internal power supply voltage at the second node being equal to a reference voltage, the second node having the internal power supply voltage applied thereto, wherein the power supplier includes,
a first power supplier configured to receive a positive power supply voltage as the external power supply voltage from the PMIC, and to drive gate lines of the in-cell type touch panel by performing boosting, discharging, and pre-charging between the positive power supply voltage and a gate high voltage, the first power supplier including,
a first PMOS transistor having a source, a drain and a gate, the source of the first PMOS transistor connected to the second node and the gate of the first PMOS transistor configured to receive a control signal indicating that the display driver IC has entered the first mode;
a second PMOS transistor having a source, a drain and a gate, the source of the second PMOS transistor connected to the drain of the first PMOS transistor, the drain of the second PMOS transistor connected to a ground, and the gate of the second PMOS transistor configured to receive a first voltage;
a first current source connected to the second node, the first current source configured to supply a current having a first current level;
a third PMOS transistor connected between the first current source and a third node, the third PMOS transistor having a gate configured to receive the first voltage;
a second current source connected between the third node and the ground, the second current source configured to supply a current having a second current level, the second current level being less than the first current level; and
a fourth PMOS transistor connected between the first node and the second node, the fourth PMOS transistor having a gate configured to receive an enable signal from the third node, and

a second power supplier configured to receive a negative power supply voltage as the external power supply voltage from the PMIC, and to drive the gate lines of the in-cell type touch panel by performing boosting, discharging, and pre-charging between the negative power supply voltage and a gate low voltage.

6. The electronic apparatus of claim 5 , wherein the second power supplier comprises:
a first NMOS transistor having a source, a drain and a gate, the drain of the first NMOS transistor connected to the second node and the gate of the first NMOS transistor configured to receive the control signal indicating that the display driver IC has entered the first mode;
a second NMOS transistor having a source, a drain and a gate, the drain of the second NMOS transistor connected to the source of the first NMOS transistor, the source of the second NMOS transistor connected to the ground, and the gate of the second NMOS transistor configured to receive a second voltage;
a third current source connected to the second node and the third node, the first current source configured to supply a current having a third current level;
a third NMOS transistor connected between the first current source and the third node, a gate of the third NMOS transistor configured to receive the second voltage;
a fourth current source connected between the third NMOS transistor and the ground, the second current source configured to supply a current having a fourth current level, the fourth current level being greater than the third current level; and
a fourth NMOS transistor connected between the first node and the second node, the fourth NMOS transistor having a gate configured to receive the enable signal from the third node.

7. The electronic apparatus of claim 5 , wherein the in-cell type touch panel comprises:
a gate driver configured to control activation of gate lines of the in-cell type touch panel via the internal power supply voltage.

8. The electronic apparatus of claim 5 , wherein the display driver IC is further configured to transmit a sca

Assignees

• Samsung Electronics Co Ltd

Inventors

• Jeong Eui-Hyuk
• Kim Si-Woo
• Kim Jeong-Pyo

Classifications

• G09G3/20 Primary

  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} · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G09G2330/028

  Generation of voltages supplied to electrode drivers in a matrix display other than LCD · CPC title

• Y02D10/153

  Cross-Sectional Technologies · mapped topic

• Y02D50/20

  Cross-Sectional Technologies · mapped topic