TWI792878B - Ground potential difference compensation circuit, display driver chip, display and information processing device - Google Patents

Abstract

A ground potential difference compensation circuit for compensating the voltage drop difference between the power ground of each output channel of a display driver chip and a reference ground, which has: a first capacitor, the upper electrode and the lower electrode of which are correspondingly passed through A first switch and a second switch are coupled to a positive terminal and a negative terminal of a reference voltage; and a second capacitor, the upper electrode of which is used to provide an output voltage, and the lower electrode of which is coupled to a power ground terminal , and the upper electrode and the lower electrode of the second capacitor are correspondingly coupled to the upper electrode and the lower electrode of the first capacitor via a third switch and a fourth switch; during operation, the compensation circuit is periodically switching between a first phase configuration and a second phase configuration, when the compensation circuit is in the first phase configuration, both the first switch and the second switch are turned on and the third switch and Both the fourth switches are turned off; when the compensation circuit is in the second phase configuration, both the first switch and the second switch are turned off and the third switch and the fourth switch are both turned on.

Description

Ground potential difference compensation circuit, display driver chip, display and information processing device

The invention relates to a compensation circuit for a display driver chip, in particular to a compensation circuit for a ground potential difference of a display driver chip.

Please refer to FIG. 1 , which is a schematic diagram of connecting each output channel 12 of a conventional display driver chip 10 with a substrate reference ground 21 through a bond wire. As shown in FIG. 1, in the display driver chip 10, the positive terminal 11a of a reference voltage source 11 is connected to the power supply terminal 12a of each output channel 12 through wiring, and the negative terminal 11b is connected to the substrate reference ground 21 through wiring. The power ground (power ground) terminal 12b of each output channel 12 is connected to the substrate reference ground 21 through a bonding wire.

However, when the current flows through each output channel 12, due to the voltage drop caused by bonding, the voltage of each power ground terminal 12b relative to the substrate reference ground 21 will be inconsistent, resulting in different reference voltages for each output channel 12 , thereby affecting the picture quality of the monitor.

In order to solve the above problems, there is an urgent need in the art for a novel ground potential difference compensation circuit.

The main purpose of the present invention is to disclose a ground potential difference compensation circuit, which can use multiple charge pumps to transfer the voltage difference between a reference voltage and a reference ground to the power supply terminals and power of multiple output channels of a display driver chip. ground to ensure that each of the output channels operates at the same bias voltage.

Another object of the present invention is to disclose a display driver chip, which can ensure that each output channel of the chip operates under the same bias voltage through the above-mentioned compensation circuit.

Another object of the present invention is to disclose a display, which can ensure uniform brightness of the displayed picture through the above-mentioned display driver chip.

Another object of the present invention is to disclose an information processing device, which can use the above-mentioned display driver chip to ensure uniform brightness of the picture on the display screen.

In order to achieve the aforementioned purpose, a ground potential difference compensation circuit is proposed, which is used to compensate the voltage drop difference between the power ground terminal of each output channel of a display driver chip and a reference ground, and it has: a first capacitance , the upper electrode and the lower electrode are correspondingly coupled to the positive terminal and the negative terminal of a reference voltage via a first switch and a second switch; and a second capacitor, the upper electrode of which is used to provide an output voltage, and Its lower electrode is coupled to a power ground terminal, and the upper electrode and the lower electrode of the second capacitor are correspondingly coupled to the upper electrode of the first capacitor and the lower electrode via a third switch and a fourth switch. The lower electrode; during operation, the ground potential difference compensation circuit is periodically switched between a first phase configuration and a second phase configuration, when the ground potential difference compensation circuit is in the first phase configuration, Both the first switch and the second switch are turned on and the third switch and the fourth switch are both turned off; when the ground potential difference compensation circuit is in the second phase configuration, the first switch and the second switch are both turned off and both the third switch and the fourth switch are turned on.

In a possible embodiment, the display driver chip can be an LED display driver chip or an OLED display driver chip.

In one embodiment, the ground potential difference compensation circuit shifts the voltage difference between the reference voltage and the reference ground to a voltage by periodically switching between the first phase configuration and the second phase configuration. Between the output voltage and a power ground terminal.

In order to achieve the aforementioned purpose, the present invention further proposes a display driver chip, which has a plurality of ground potential difference compensation circuits for compensating the voltage drop difference between the power ground terminal of each output channel and a reference ground, each of the ground potentials The difference compensation circuits all have: a first capacitor, the upper electrode and the lower electrode of which are correspondingly coupled to the positive terminal and the negative terminal of a reference voltage through a first switch and a second switch; and a second capacitor, on which The electrode is used to provide an output voltage, and its lower electrode is coupled to a power ground terminal, and the upper electrode and the lower electrode of the second capacitor are correspondingly coupled via a third switch and a fourth switch the upper electrode and the lower electrode of the first capacitor; In operation, each of the ground potential difference compensation circuits is periodically switched between a first phase configuration and a second phase configuration, when each of the ground potential difference compensation circuits is in the first phase configuration , the first switch and the second switch are both turned on and the third switch and the fourth switch are turned off; when each of the ground potential difference compensation circuits is in the second phase configuration, the first switch and the Both the second switches are turned off and both the third switch and the fourth switch are turned on.

In a possible embodiment, the display driver chip can be an LED display driver chip or an OLED display driver chip.

In one embodiment, each of the ground potential difference compensation circuits shifts the voltage difference between the reference voltage and the reference ground by periodically switching between the first phase configuration and the second phase configuration between the output voltage and the power ground.

To achieve the aforementioned purpose, the present invention further proposes a display, which has a display module and at least one display driver chip as mentioned above.

In a possible embodiment, the display module can be a micro light emitting diode display module, a mini light emitting diode display module, a quantum dot light emitting diode display module or an organic light emitting diode Display mods.

To achieve the aforementioned purpose, the present invention further proposes an information processing device, which has a central processing unit and the aforementioned display, wherein the central processing unit is used to communicate with the display.

In a possible embodiment, the information processing device may be a smart phone, a portable computer, a vehicle computer, a wearable electronic device or an advertising billboard.

In order to enable your examiners to further understand the structure, features and purpose of the present invention, drawings and detailed descriptions of preferred specific embodiments are hereby attached.

10: Display driver chip

11: Reference voltage source

11a: Positive end

11b: negative terminal

12: Output channel

12a: power supply terminal

12b: Power ground terminal

21: Substrate reference ground

100: Display driver chip

110: Reference voltage source

110a: Positive end

110b: negative terminal

111: Compensation circuit

111a: first switch

111b: second switch

111c: the first capacitor

111d: the third switch

111e: the fourth switch

111f: the second capacitor

120: output channel

120a: power supply terminal

120b: power ground terminal

200: display

210: drive circuit

220: display module

300: information processing device

310: central processing unit

320: display

FIG. 1 is a schematic diagram of connecting each output channel of a conventional display driver chip with a reference ground through bonding.

FIG. 2 is a block diagram of an embodiment of the display driver chip of the present invention.

FIG. 3 is a circuit diagram of an embodiment of the compensation circuit of the display driver chip shown in FIG. 2 .

4a and 4b respectively illustrate the equivalent circuit diagrams of a first phase configuration and a second phase group of the compensation circuit of FIG. 3 .

FIG. 5 shows a block diagram of an embodiment of the display of the present invention.

FIG. 6 is a block diagram of an embodiment of an information processing device of the present invention.

Please refer to FIG. 2 , which is a block diagram of an embodiment of the display driver chip of the present invention. As shown in FIG. 2, a display driver chip 100 has a reference voltage source 110, a plurality of compensation circuits 111 and a plurality of output channels 120, wherein the reference voltage source 110 has a positive terminal 110a and a negative terminal 110b to couple each The input port of the compensation circuit 111, each compensation circuit 111 generates an output voltage according to the input voltage of the reference voltage source 110, and connects the positive terminal and the negative terminal of the output voltage to the power supply terminal 120a and the power ground of a corresponding output channel 120 end 120b. According to this, the present invention can compensate the voltage drop difference between the power ground 120b of each output channel 120 and a substrate reference ground.

Please refer to FIG. 3 , which shows a circuit diagram of an embodiment of the compensation circuit 111 . As shown in FIG. 3 , the compensation circuit 111 has a first switch 111a, a second switch 111b, a first capacitor 111c, a third switch 111d, a fourth switch 111e and a second capacitor 111f.

The upper electrode and the lower electrode of the first capacitor 111c are correspondingly connected to the positive terminal 110a and the negative terminal 110b via the first switch 111a and the second switch 111b to couple to a reference voltage V _REF .

The upper electrode and the lower electrode of the second capacitor 111f are respectively connected to the power supply terminal 120a and the power ground terminal 120b to provide an output voltage V _O , and the upper electrode and the lower electrode of the second capacitor 111f are correspondingly passed through the third switch 111d And the fourth switch 111e is coupled to the upper electrode and the lower electrode of the first capacitor 111c.

The operation of the compensation circuit 111 in FIG. 3 can be divided into a first phase configuration and a second phase group. Please refer to FIGS. 4a and 4b for its circuit diagram, and the compensation circuit 111 is periodically switched between the first phase configuration and the in the second phase configuration. As shown in Figure 4a, when the compensation circuit 111 is in the first phase configuration, both the first switch 111a and the second switch 111b are turned on and the third switch 111d and the fourth switch 111e are both turned off; when the compensation circuit 111 is in the In the second phase configuration, both 111a and the second switch 111b are turned off and Both the third switch 111d and the fourth switch 111e are turned on. Accordingly, each compensation circuit 111 can make each output channel 120 see the same reference voltage, so as to compensate the ground potential difference between each output channel 120 .

In addition, the display driver chip 100 can be an LED display driver chip or an OLED display driver chip.

According to the above description, the present invention further provides a display. Please refer to FIG. 5 , which shows a block diagram of an embodiment of the display of the present invention. As shown in Figure 5, a display 200 has a driver circuit 210 and a display module 220, wherein the driver circuit 210 has at least one display driver chip 100, and the display module 220 can be a micro light emitting diode display module 1. A mini light emitting diode display module, a quantum dot light emitting diode display module or an organic light emitting diode display module.

According to the above description, the present invention further provides an information processing device. Please refer to FIG. 6 , which shows a block diagram of an embodiment of the information processing device of the present invention. As shown in FIG. 6 , an information processing device 300 has a central processing unit 310 and a display 320 , wherein the central processing unit 310 is used to communicate with the display 320 , and the display 320 is realized by the display 200 .

In addition, the information processing device 300 can be a smart phone, a portable computer, a vehicle computer, a wearable electronic device or an advertising billboard.

With the design disclosed above, the present invention has the following advantages:

1. The ground potential difference compensation circuit of the present invention can use multiple charge pumps to transfer the voltage difference between a reference voltage and a reference ground to between the power supply terminal and the power ground terminal of multiple output channels of a display driver chip, This ensures that each of the output channels operates at the same bias voltage.

2. The display driver chip of the present invention can ensure that each output channel operates under the same bias voltage through the above-mentioned compensation circuit.

3. The display of the present invention can ensure that the displayed picture has uniform brightness by the above-mentioned display driver chip.

4. The information processing device of the present invention can use the above-mentioned display driver chip to ensure uniform brightness of the picture on the display screen.

What is disclosed in this case is a preferred embodiment. For example, any partial changes or modifications derived from the technical ideas of this case and easily deduced by those who are familiar with the technology are within the scope of the patent right of this case.

To sum up, regardless of the purpose, means and efficacy of this case, it shows that it is very different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. I implore your review committee to understand it clearly and grant a patent as soon as possible. Society is for the Most Prayer.

100: Display driver chip

110: Reference voltage source

110a: Positive end

110b: negative terminal

111: Compensation circuit

120: output channel

120a: power supply terminal

120b: power ground terminal

Claims (10)

A ground potential difference compensation circuit for compensating the voltage drop difference between the power ground of each output channel of a display driver chip and a reference ground, which has: a first capacitor, the upper electrode and the lower electrode of which are correspondingly passed through A first switch and a second switch are coupled to a positive terminal and a negative terminal of a reference voltage; and a second capacitor, the upper electrode of which is used to provide an output voltage, and the lower electrode of which is coupled to a power ground terminal , and the upper electrode and the lower electrode of the second capacitor are correspondingly coupled to the upper electrode and the lower electrode of the first capacitor via a third switch and a fourth switch; during operation, the ground potential difference The compensation circuit is periodically switched between a first phase configuration and a second phase configuration, and when the ground potential difference compensation circuit is in the first phase configuration, both the first switch and the second switch are turned on And both the third switch and the fourth switch are turned off; when the ground potential difference compensation circuit is in the second phase configuration, the first switch and the second switch are both turned off and the third switch and the first switch All four switches are turned on. The ground potential difference compensation circuit described in item 1 of the scope of the patent application, wherein the display driver chip is an LED display driver chip or an OLED display driver chip. The ground potential difference compensation circuit described in item 1 of the scope of the patent application, wherein the ground potential difference compensation circuit periodically switches between the first phase configuration and the second phase configuration to set the reference A voltage difference between the voltage and the reference ground is transferred between a said output voltage and a said power ground. A display driver chip, which has a plurality of ground potential difference compensation circuits for compensating the voltage drop difference between the power ground terminal of each output channel and a reference ground, and each of the ground potential difference compensation circuits has: a first a capacitor, the upper electrode and the lower electrode of which are correspondingly coupled to the positive terminal and the negative terminal of a reference voltage via a first switch and a second switch; and a second capacitor, the upper electrode of which is used to provide an output voltage, And its lower electrode is coupled to a power ground terminal, and the upper electrode and the lower electrode of the second capacitor are correspondingly coupled to the upper electrode and the first capacitor via a third switch and a fourth switch the lower electrode; In operation, each of the ground potential difference compensation circuits is periodically switched between a first phase configuration and a second phase configuration, when each of the ground potential difference compensation circuits is in the first phase configuration , the first switch and the second switch are both turned on and the third switch and the fourth switch are turned off; when each of the ground potential difference compensation circuits is in the second phase configuration, the first switch and the Both the second switches are turned off and both the third switch and the fourth switch are turned on. The display driver chip as described in Item 4 of the scope of the patent application is an LED display driver chip or an OLED display driver chip. The display driver chip as described in item 4 of the scope of the patent application, wherein each of the ground potential difference compensation circuits periodically switches between the first phase configuration and the second phase configuration to set the reference The voltage difference between the voltage and the reference ground is transferred between the output voltage and the power ground. A display, which has a display module and at least one display driver chip as described in item 4 of the patent application. The display described in item 7 of the scope of the patent application, wherein the display module is composed of a micro-light-emitting diode display module, a mini-light-emitting diode display module, and a quantum dot light-emitting diode display module A display module selected as a group formed with an organic light emitting diode display module. An information processing device has a central processing unit and a display as described in any one of items 7 to 8 of the scope of the patent application, wherein the central processing unit is used to communicate with the display. The information processing device described in item 9 of the scope of the patent application is one selected from the group consisting of a smart phone, a portable computer, a vehicle-mounted computer, a wearable electronic device and an advertising billboard device.

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