TFT liquid crystal module power supply chip, display panel and electronic terminal

Abstract

A TFT liquid crystal module power supply chip, a display panel and an electronic terminal, the TFT liquid crystal module power supply chip comprises: an input pin; at least two output pin groups, the at least two output pin groups are respectively used for supplying power for a backlight source and supplying power for a liquid crystal display driving chip.The technical scheme can reduce the area of the TFT liquid crystal module power supply chip and improve the performance of the chip.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a TFT liquid crystal module power chip, display panel, and electronic terminal. Background Technology

[0002] As a crucial foundation of the electronics and information industry and the future replacement for traditional cathode ray tube (CRT) technology, liquid crystal display (LCD) technology plays a vital role in promoting economic transformation, optimizing and upgrading industrial structures, and driving the development of high-tech industries. Thin-film transistor (TFT) liquid crystal displays (LCDs) are a type of active-matrix liquid crystal display (AM-LCD). LCD flat panel displays, especially TFT-LCDs, are currently the only display devices that comprehensively match and surpass cathode ray tube (CRT) displays in terms of brightness, contrast ratio, power consumption, lifespan, size, and weight. Their superior performance, large-scale production capabilities, high degree of automation, low raw material costs, and broad development prospects have enabled them to rapidly become the mainstream product of the new century.

[0003] In existing technology, a TFT LCD module includes: a TFT LCD panel, a backlight layer, a backlight LED (Light-Emitting Diode, LED) power driver chip, a power chip for the LCD display driver chip, and an LCD display driver chip. The backlight LED power driver chip and the power chip are located on the mobile phone motherboard.

[0004] However, the driving signals of TFT-LCDs are very complex, and the peripheral control circuits are also quite complex. How to reduce the area of ​​the power supply chip in TFT LCD modules and improve the chip's performance is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The technical problem solved by this invention is how to reduce the area of ​​the power supply chip in a TFT LCD module and improve the chip's performance.

[0006] To address the aforementioned technical problems, this invention provides a TFT LCD module power supply chip, which includes: an input pin; and at least two output pin groups, wherein the at least two output pin groups supply power to the backlight source and power to the LCD display driver chip, respectively.

[0007] Optionally, the at least two output pin groups include: a first output pin group, including an output voltage pin and a feedback pin, for supplying power to the backlight power supply; and a second output pin group, including an on-state voltage output pin and an off-state voltage output pin, for supplying power to the liquid crystal display driver chip.

[0008] Optionally, the voltage range of the open voltage output pin is 10-25V, and the voltage range of the close voltage output pin is -10 to -25V.

[0009] Optionally, the at least two output pin groups include: a first output pin group, including an output signal pin and an interface pin, for supplying power to the backlight power supply; and a second output pin group, including a first voltage output pin and a second voltage output pin, for supplying power to the liquid crystal display driver chip, wherein the value of the first voltage is less than the value of the second voltage.

[0010] Optionally, the TFT LCD module power supply chip includes a register for controlling the first voltage output pin and the second voltage output pin to output power supply signals to the LCD driver chip.

[0011] Optionally, the turn-on voltage output pin is coupled to the first input pin of the liquid crystal display driver chip, and the turn-off voltage output pin is coupled to the second input pin of the liquid crystal display driver chip.

[0012] Optionally, the TFT LCD module power chip includes at least two control units, which respectively control the output voltage of the at least two output pin groups.

[0013] Optionally, the input pins include: an input control pin for receiving an input control signal, wherein the voltage value of the input control signal is within a preset range; an enable pin for receiving a pulse signal to control the output pin group to supply power to the backlight source; and a ground pin.

[0014] This invention also provides a display panel, which includes the TFT liquid crystal module power chip.

[0015] This invention also provides an electronic terminal, which includes the TFT liquid crystal module power chip.

[0016] Compared with the prior art, the technical solution of the embodiments of the present invention has the following beneficial effects:

[0017] In this invention, the TFT LCD module power supply chip includes input pins and at least two output pin groups, which respectively power the backlight source and the LCD driver chip. Compared to the prior art that requires two separate chips for power supply, this invention reduces the chip area and lowers the chip cost by providing at least two output pin groups for powering the backlight source and the LCD driver chip, respectively. Furthermore, by directly powering the LCD driver chip, the external circuitry such as the charge pump required to generate intermediate voltage within the LCD driver chip is avoided, thus improving the driving capability of the display driver chip and reducing power consumption. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a backlight power driver chip in the prior art;

[0019] Figure 2 This is a schematic diagram of the power supply chip for a liquid crystal display driver chip in the prior art;

[0020] Figure 3 This is a schematic diagram of a liquid crystal display driver chip in the prior art;

[0021] Figure 4 This is a schematic diagram of the structure of a TFT LCD module power supply chip according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of another TFT LCD module power chip according to an embodiment of the present invention. Detailed Implementation

[0023] As described in the background section, the driving signals for TFT-LCDs are very complex, and the peripheral control circuits are also quite complex. How to reduce the area of ​​the power supply chip for TFT LCD modules and improve the chip's performance is a technical problem that urgently needs to be solved.

[0024] In this invention, the TFT LCD module power supply chip includes input pins and at least two output pin groups, which respectively power the backlight source and the LCD driver chip. Compared to the prior art that requires two separate chips for power supply, this invention reduces the chip area and lowers the chip cost by providing at least two output pin groups for powering the backlight source and the LCD driver chip, respectively. Furthermore, by directly powering the LCD driver chip, the external circuitry such as the charge pump required to generate intermediate voltage within the LCD driver chip is avoided, thus improving the driving capability of the display driver chip and reducing power consumption.

[0025] In the prior art, please refer to Figure 1The output pins VOUT and FB of the backlight power driver chip can provide an adjustable power supply voltage to each LED, such as LED1, LED2, ... LED10, for example, a maximum voltage of 33 volts (V).

[0026] Please refer to the above as well. Figure 2 and Figure 3 The AVDD and AVEE outputs of the power supply chip in the liquid crystal display (LCD) driver chip are the intermediate voltages used by the LCD driver chip to generate VGH and VGL voltages, and the driving voltages for the source circuit of the LCD panel. VGH and VGL are the voltages provided by the LCD driver chip to the TFT devices of the LCD panel for turning them on and off. AVDD and AVEE are +5.5V and -5.5V, respectively.

[0027] It should be noted that not all chip pins are shown in the accompanying drawings of the present invention. Those skilled in the art can add corresponding chip pins based on the adaptability of chip functions, and the embodiments of the present invention do not limit this.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Figure 4 This is a schematic diagram of the structure of a TFT LCD module power chip according to an embodiment of the present invention.

[0030] Specifically, the TFT LCD module power supply chip may include an input pin VIN and at least two output pin groups VOUT1 and VOUT2. The at least two output pin groups VOUT1 and VOUT2 supply power to the backlight source and the LCD driver chip, respectively.

[0031] The TFT LCD module power chip of this invention combines the functions of the backlight power driver chip and the LCD display driver chip in the prior art into one. The TFT LCD module power chip provides two power outputs: one power supply for the backlight, such as powering the backlight LEDs; and the other power supply for the LCD display driver chip.

[0032] In a non-limiting embodiment, the TFT LCD module power chip can provide a maximum voltage of 33V and a current of 1.2A, which can simultaneously supply the backlight power supply and the LCD driver chip without increasing costs. It only requires adding corresponding output pins during chip design.

[0033] The TFT LCD module power chip of this invention can eliminate the need for a power chip in electronic terminals such as smartphones and tablets, saving packaging costs and internal chip layout space, thereby reducing the overall cost of the device.

[0034] Furthermore, the TFT LCD module power chip of this embodiment integrates the functions of two chips, which can save components in the peripheral circuit of the driver chip and improve the driving capability of the chip.

[0035] The reason why the embodiments of the present invention can power both the backlight source and the liquid crystal display driver chip using the same chip is that driving the backlight source and driving the liquid crystal display are usually not performed simultaneously. For example, when the display screen of the terminal changes, the backlight source usually remains unchanged. This allows the TFT liquid crystal module power chip of the embodiments of the present invention to meet the needs of powering both the backlight source and the liquid crystal display driver chip.

[0036] In a non-limiting embodiment of the present invention, the first output pin group VOUT1 may include an output voltage pin and a feedback pin for supplying power to the backlight power supply; the second output pin group VOUT2 includes an on voltage output pin VGH and an off voltage output pin VGL for supplying power to the liquid crystal display driver chip.

[0037] The first output pin group VOUT1 can be referenced from the output pins of the backlight power driver chip in the prior art, and will not be described again here.

[0038] Furthermore, the voltage range output by the open voltage output pin is 10-25V, and the voltage range output by the close voltage output pin is -10 to -25V.

[0039] In a non-limiting embodiment of the present invention, the first output pin group includes an output signal pin and an interface pin, used to power the backlight power supply; the second output pin group includes a first voltage output pin and a second voltage output pin, used to power the liquid crystal display driver chip, wherein the value of the first voltage is less than the value of the second voltage.

[0040] The TFT LCD module power supply chip also includes a register (not shown in the figure), which is used to control the first voltage output pin and the second voltage output pin to output power supply signals to the LCD driver chip.

[0041] In a non-limiting embodiment of the present invention, the TFT liquid crystal module power chip includes at least two sets of control units, which respectively control the output voltage of the at least two output pin groups.

[0042] In one specific embodiment, the TFT LCD module power supply chip includes an input control pin VIN for receiving an input control signal, the voltage value of which is within a preset range; an enable pin EN for receiving a pulse signal to control the output pin group to supply power to the backlight source; and a ground pin GND.

[0043] Please refer to the details. Figure 5 The input control pin VIN receives the control voltage and requires a stable voltage of 2.8V-5V. The enable pin EN serves as the port for controlling the backlight VBL voltage, controlled by a pulse width modulation (PWM) signal provided by the terminal.

[0044] The output pin VSP is controlled by the internal registers of the power supply chip to output voltages of approximately +5V and -5V to the driver chip. The output pins VGH / VGL are controlled by the internal registers of the power supply chip to output voltages of approximately + / -20V to the driver chip. The output pin VBL outputs approximately +35V to the driver chip from the power supply chip. The output pin IOVCC outputs approximately 1.8V to the driver chip from the power supply chip.

[0045] The TFT LCD module power chip of this invention can directly provide VGH and VGL voltages, eliminating the need for the charge pump circuits (AVDD and AVEE) inside the LCD driver chip to generate VGH and VGL. This achieves zero peripheral circuit components, improves the driving capability of the display driver chip, and reduces power consumption.

[0046] Compared to the backlight power driver chip in the prior art, the TFT LCD module power chip in this embodiment of the invention only requires the addition of output pins VGH and VGL during product design to enable power supply to the backlight source and the LCD display driver chip.

[0047] This invention also discloses a display panel, which includes the TFT liquid crystal module power supply chip. The display panel may be a TFT-LCD.

[0048] This invention also discloses an electronic terminal, wherein the user equipment may include the TFT LCD module power supply chip. The electronic terminal includes, but is not limited to, mobile phones, computers, tablet computers, and other terminal devices.

[0049] In the embodiments of this application, "multiple" refers to two or more.

[0050] The descriptions of "first," "second," etc., appearing in the embodiments of this application are for illustrative purposes and to distinguish the objects being described. They have no order and do not indicate any special limitation on the number of devices in the embodiments of this application, nor do they constitute any limitation on the embodiments of this application.

[0051] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0052] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can be physically comprised separately, or two or more units can be integrated into one unit. The integrated unit described above can be implemented in hardware or in the form of hardware plus software functional units.

[0053] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A power supply chip for a TFT LCD module, characterized in that, include: Input pins; At least two output pin groups, wherein the at least two output pin groups are respectively for powering the backlight source and for powering the liquid crystal display driver chip; At least two control units, each controlling the output voltage of the at least two output pin groups; The at least two output pin groups include: a first output pin group, including an output voltage pin for powering the backlight source and an interface pin; and a second output pin group for powering the liquid crystal display driver chip; the second output pin group includes a first voltage output pin and a second voltage output pin, wherein the value of the first voltage is less than the value of the second voltage. The input pins include an enable pin, which is used to receive a pulse signal and control the first output pin group to supply power to the backlight source. A register is used to control the first voltage output pin and the second voltage output pin to output power supply signals to the liquid crystal display driver chip. The output voltages of the first voltage output pin and the second voltage output pin are the turn-on and turn-off voltages of the liquid crystal display driver chip.

2. The TFT LCD module power supply chip according to claim 1, characterized in that, The first output pin group also includes a feedback pin; The second output pin group includes an on-voltage output pin and an off-voltage output pin.

3. The TFT LCD module power supply chip according to claim 2, characterized in that, The voltage range of the open voltage output pin is 10-25V, and the voltage range of the close voltage output pin is -10 to -25V.

4. The TFT LCD module power supply chip according to claim 2, characterized in that, The turn-on voltage output pin is coupled to the first input pin of the liquid crystal display driver chip, and the turn-off voltage output pin is coupled to the second input pin of the liquid crystal display driver chip.

5. The TFT LCD module power supply chip according to claim 1, characterized in that, include: At least two control units control the output voltage of the at least two output pin groups respectively.

6. The TFT LCD module power supply chip according to claim 1, characterized in that, The input pin also includes: An input control pin is used to receive an input control signal, the voltage value of which is within a preset range; Grounding pin.

7. A display panel, characterized in that, Includes the TFT liquid crystal module power chip as described in any one of claims 1 to 6.

8. An electronic terminal, characterized in that, Includes the TFT liquid crystal module power chip as described in any one of claims 1 to 6.

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