Display device

Abstract

This invention proposes a display device, comprising: a display panel module, including a display panel, a panel driver board, and a flexible circuit board connecting the two, wherein the panel driver board integrates a backlight driving circuit and a correction circuit; a main control board module, including a main controller and a storage unit, wherein the main controller is electrically connected to the storage unit; the panel driver board further includes an interface circuit, wherein the interface circuit includes a low-voltage differential signal interface, an embedded display interface, and a serial communication bus interface; the main control board module is connected to the panel driver board through the low-voltage differential signal interface or the embedded display interface to transmit image data, and is connected to the backlight driving circuit and the correction circuit through the serial communication bus interface to transmit control signals.

Description

Technical Field

[0001] This invention relates to a display device. Background Technology

[0002] With the development of display technology, higher demands are being placed on the integration, thinness, display effect, and adaptability to different scenarios of display devices. However, in related technologies, the functions of each module are often implemented by independent circuit boards, resulting in complex system structure, large size, high cost, and susceptibility to signal transmission stability. Furthermore, they typically lack convenient remote control or integration capabilities with external sensors or smart devices, limiting their application in smart scenarios such as the Internet of Things (IoT). Utility Model Content

[0003] According to one aspect of the present invention, a display device is provided, comprising:

[0004] The display panel module includes a display panel, a panel driver board, and a flexible circuit board connecting the two. The panel driver board integrates a backlight driving circuit and a correction circuit.

[0005] The main control board module includes a main controller and a storage unit, wherein the main controller is electrically connected to the storage unit;

[0006] The panel driver board also includes an interface circuit, which includes a low-voltage differential signal interface, an embedded display interface, and a serial communication bus interface.

[0007] The main control board module is connected to the panel driver board through the low-voltage differential signal interface or the embedded display interface to transmit image data, and is connected to the backlight driving circuit and the correction circuit through the serial communication bus interface to transmit control signals.

[0008] In one embodiment of this invention, the backlight driving circuit communicates with the main controller through the serial communication bus interface. The backlight driving circuit receives the dimming command from the main controller through the serial communication bus and outputs an adjustable current to the backlight unit of the display panel.

[0009] In one embodiment of this novel invention, the backlight driving circuit consists of a constant voltage source connected in series with a current-limiting resistor. The current-limiting resistor is connected in series in the LED light strip circuit. The current is adjusted through the current-limiting resistor to reserve a brightness buffer, and an adjustable current is output to the backlight unit of the display panel.

[0010] In one embodiment of this invention, the backlight driving circuit uses a dedicated LED driver chip, which adjusts the current to reserve a brightness buffer and outputs an adjustable current to the backlight unit of the display panel.

[0011] In one embodiment of this invention, the calibration circuit communicates with the main controller via the serial communication bus interface. It receives image gamma value configuration commands from the main controller via the serial communication bus and calibrates the image gamma value of the display panel. The calibration circuit comprises:

[0012] A multi-channel gamma value reference circuit includes multiple first digital-to-analog converter registers and multiple programmable buffers, with each buffer connected to the output of one of the first digital-to-analog converter registers;

[0013] A reference circuit includes a second digital-to-analog converter register and a programmable reference amplifier connected to the output of the second digital-to-analog converter register;

[0014] The reprogrammable memory is connected to the serial communication bus interface, the first digital-to-analog converter register, and the second digital-to-analog converter register.

[0015] In one embodiment of this novel invention, the main control board module further includes a communication module.

[0016] The communication module includes a 4G / 5G communication module and / or a WiFi communication module.

[0017] The 4G / 5G communication module is electrically connected to the main controller through a universal asynchronous transceiver interface, a serial peripheral interface, or a universal serial bus interface.

[0018] The WiFi communication module is electrically connected to the main controller via an asynchronous transceiver interface, a serial peripheral interface, a secure digital input / output interface, or a serial communication bus interface.

[0019] In one embodiment of this novel invention, the low-voltage differential signal interface includes one pair of differential clock lines and at least four pairs of differential data lines.

[0020] In one embodiment of this invention, the main control board module is further provided with an expansion interface, which includes at least one of a universal asynchronous transceiver interface, a serial peripheral interface, an inter-integrated circuit bus interface, or a universal input / output interface, for connecting external sensors or peripherals.

[0021] In one embodiment of this novel invention, one end of the flexible circuit board is connected to the substrate of the display panel, and the other end is connected to the panel driver board through a pluggable interface.

[0022] In one embodiment of this invention, the display device further includes a host computer terminal, which is connected to the 4G / 5G communication module and WiFi communication module of the main control board module via a universal serial bus interface or a network.

[0023] As can be seen from the above solutions, the advantages of this new invention are:

[0024] The display device provided by this invention integrates an LED backlight driving circuit and a panel driver board.

[0025] The gamma correction circuit, with its integrated structure, reduces the number of discrete components and shortens the signal transmission path. Simultaneously, its pluggable flexible circuit board connection simplifies assembly and facilitates maintenance and replacement. The panel driver board integrates various types of interfaces to adapt to different display panels, enhancing compatibility. Furthermore, the main control board features different types of expansion interfaces, supporting remote data interaction and external sensor connection, flexibly adapting to various scenarios and improving the device's practicality and expandability.

[0026] To provide a better understanding of the above and other aspects of this invention, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0027] Figure 1 A schematic block diagram illustrating the overall structure of a display device according to the present invention is shown.

[0028] Figure 2 A schematic diagram of the structure of an LED backlight driving circuit according to an embodiment is shown.

[0029] Figure 3 A schematic diagram of the structure of a Gamma correction circuit provided in one embodiment is shown.

[0030] In the attached figures, the following labels are used:

[0031] 10: Display device;

[0032] 20: Display panel module;

[0033] 21: Display panel;

[0034] 22: Panel driver board;

[0035] 221: LED backlight driving circuit;

[0036] 2211: Constant pressure source;

[0037] 2212: Current-limiting resistor;

[0038] 2213: LED strip light circuit;

[0039] 222: Gamma correction circuit;

[0040] 2221: Gamma reference circuit;

[0041] 2222: Reference circuit;

[0042] 2223: Multiple programmable memory;

[0043] 2224: Controller;

[0044] 22211: First DAC register;

[0045] 22212: Programmable Gamma Buffer;

[0046] 22221: Second digital-to-analog converter register;

[0047] 22222: Programmable reference amplifier;

[0048] 2231: LVDS interface;

[0049] 2232: eDP interface;

[0050] 2233: I2C interface;

[0051] 23: Flexible Printed Circuit Board (FPC);

[0052] 30: Main control board module;

[0053] 31: Main controller;

[0054] 32: Storage unit;

[0055] 33: 4G / 5G communication module;

[0056] 34: WiFi communication module;

[0057] 35: Extension interface;

[0058] 40: Host computer terminal. Detailed Implementation

[0059] The various embodiments of this invention will be described in detail below, with illustrations provided. In addition to these detailed descriptions, this invention can be widely implemented in other embodiments, and any easy substitutions, modifications, or equivalent changes to the described embodiments are included within the scope of this invention, as specified in the claims. In the description of this specification, many specific details and embodiments are provided to give the reader a more complete understanding of this invention; however, these specific details and embodiments should not be considered as limitations of this invention. Furthermore, well-known steps or elements are not described in the details to avoid creating unnecessary limitations on this invention.

[0060] refer to Figure 1 As shown, Figure 1 A schematic block diagram of the overall structure of a display device provided in one embodiment of the present invention is shown.

[0061] The display device 10 includes a display panel module 20 and a main control board module 30. The display panel module 20 includes a display panel 21, a panel driver board 22, and an FPC flexible circuit board 23 connecting the two. The panel driver board 22 integrates an LED backlight driving circuit 221 and a gamma correction circuit 222. The main control board module 30 includes a main controller 31 and a storage unit 32, with the main controller 31 electrically connected to the storage unit 32. In one embodiment, the display panel is a thin-film transistor liquid crystal display (TFT-LCD) panel with a backlight unit, such as a light-emitting diode (LED) or a miniLED. In other embodiments, an organic light-emitting diode (OLED) can also be used as the backlight unit. One end of the flexible circuit board is connected to the substrate of the display panel, and the other end is connected to the panel driver board via a pluggable interface.

[0062] Further reference Figure 1 As shown, the panel driver board 22 also includes interface circuitry, which includes a Low-Voltage Differential Signaling (LVDS) interface 2231, an Embedded DisplayPort (eDP) interface 2232, and an Inter-Integrated Circuit Bus (I2C) interface 2233. The main control board module 30 connects to the panel driver board 22 via the LVDS interface 2231 or the embedded display port 2232 to transmit image data, and connects to the main control board 22 via the I2C interface 2233.

[0063] The LED backlight driving circuit 221 and the Gamma correction circuit 222 are connected to transmit control signals.

[0064] In one embodiment, the LED backlight driving circuit 221 communicates with the main controller 31 through the serial communication bus interface 2233. The LED backlight driving circuit 221 receives the dimming command from the main controller 31 through the serial communication bus and outputs an adjustable current to the backlight unit of the display panel.

[0065] In one embodiment, reference Figure 2 As shown, Figure 2A schematic diagram of an LED backlight driving circuit 221 according to an embodiment is shown. The LED backlight driving circuit 221 consists of a constant voltage source 2211 connected in series with a current-limiting resistor 2212. The current-limiting resistor 2212 is connected in series with an LED strip circuit 2213, which is composed of multiple LEDs connected in series and / or in parallel. The current is adjusted by the current-limiting resistor to reserve a brightness buffer, and an adjustable current is output to the backlight unit of the display panel. Specifically, taking multiple LEDs connected in series as an example, the current flowing through the LEDs determines the brightness. The current flowing through the LEDs is I_led = (VCC - V_f_total) / R_set, where VCC is the supply voltage, V_f_total is the total forward voltage drop of the LED strip circuit, and R_set is the resistance value of the current-limiting resistor. When VCC and V_f_total are relatively fixed, I_led is determined by the resistance value of R_set. The larger the resistance, the smaller the current and the lower the brightness; the smaller the resistance, the larger the current and the higher the brightness. In this embodiment, the current can be adjusted using a current-limiting resistor to reserve a brightness buffer. When calculating the resistance value of the current-limiting resistor R_set, the target brightness current is not used.

[0066] Instead of calculating I_target, it uses a current I_derated that is 10%-15% lower than the target brightness current.

[0067] The resistance value is calculated using I_target * 0.85 to 0.9, resulting in a larger value. Without a reserved brightness buffer, the initial current-limiting resistor value is: R_set_original = (VCC - V_f_total) / I_target; with a reserved brightness buffer, assuming a 10% buffer, the current-limiting resistor value is R_set_buffer = (VCC - V_f_total) / (I_target * 0.9). Therefore, initially, using the current-limiting resistor R_set_buffer, the display panel operates at I_derated current, with a brightness of approximately 90% of the target brightness. When a higher brightness is needed, the resistor R_set_buffer is replaced with a smaller resistor R_set_original, allowing the current to reach the full I_target, thus achieving 100% brightness.

[0068] In another embodiment, the LED backlight driving circuit 221 can directly use a dedicated...

[0069] LED driver chips, such as TI's LP8555, use dedicated LED driver chips to adjust the current to reserve a brightness buffer and output adjustable current to the backlight unit of the display panel. This type of dedicated LED driver chip is itself a programmable constant current source, integrating power MOSFETs and control logic. It also includes an external resistor R_iset connected to the chip's ISET pin. Unlike the above embodiment, this external resistor R_iset is not used for direct current limiting but rather to set a current reference. Furthermore, it includes a feedback network, etc., and the chip maintains a constant output by detecting current feedback. Its working principle is as follows: the maximum output current of the dedicated driver IC is: I_max = (V_ref / R_iset)*K, where I_max is the maximum output current the chip can provide; V_ref is a reference voltage inside the chip, usually a fixed value; R_iset is the resistance value of the external resistor; and K is a fixed amplification factor inside the chip. Similarly, R_iset is not initially set to 100% of I_target, but rather to a value 10%-15% lower. Without a reserved brightness buffer, the initial resistance of the current-limiting resistor is: R_iset_original = (V_ref * K) / I_target. With a reserved brightness buffer, assuming a 10% reserve, the current-limiting resistor value is R_iset_buffer = (V_ref * K) / (I_target * 0.9). Initially, using the R_iset_buffer resistor, the current is set to 90% of its maximum capacity via the chip's dimming interface (usually a digital bus such as I2C / SPI or PWM analog dimming), i.e., a scaling ratio of 0.9 is set in software. At this point, the brightness is 90%. When a brightness increase is needed, a new command is sent directly to the LED driver IC to set the current scaling ratio to 100%. The current will instantly reach I_max, i.e., full output, and the brightness will reach 100%. This method requires no hardware modifications; brightness adjustment is achieved through software control. In addition, in this embodiment, the dedicated LED driver chip typically integrates an overcurrent protection module (OCP), an overvoltage protection module (OVP), an overtemperature protection module (OTP), and an LED open / short circuit protection module. The overcurrent protection module detects and shuts off the output when the LED current exceeds a threshold using a sampling resistor, preventing the LED from burning out due to overcurrent. The overvoltage protection module triggers a protection switch when the input or output voltage is too high (e.g., a voltage spike at the output due to an LED open circuit). The overtemperature protection module integrates a temperature sensor; when the junction temperature exceeds a threshold, it gradually reduces the output current or shuts down the chip to prevent thermal runaway. The LED open / short circuit protection cuts off the output when the LED is open and limits the current when it is short-circuited.

[0070] In one embodiment, reference Figure 3 As shown, Figure 3A schematic diagram of a Gamma correction circuit 222 provided in one embodiment is shown. The Gamma correction circuit 222 communicates with the main controller 31 via a serial communication bus interface 2233, and it communicates via I... 2 The C-bus receives the image gamma value configuration command from the main controller and calibrates the gamma value of the display panel.

[0071] The Gamma correction circuit 222 includes: a multi-channel Gamma reference circuit 2221, a single reference circuit 2222, a multiple-time programmable (MTP) memory 2223, and a controller 2224. The multi-channel Gamma reference circuit 2221 includes multiple first digital-to-analog converter (DAC) registers 22211 and multiple programmable Gamma buffers 22212, with each Gamma buffer 22212 connected to the output of one of the first DAC registers 22211. The reference circuit 2222 includes a second DAC register 22221 and a programmable reference amplifier 22222 connected to the output of the second DAC register 22221. The multiple-time programmable memory 2223 is connected to the serial communication bus interface 2233, the first DAC register 22211, and the second DAC register 22221 via the controller 2224.

[0072] The principle of this gamma correction circuit is as follows: The main controller sends an image gamma value configuration command to the controller of the gamma correction circuit via the I2C serial communication bus interface. The image gamma value configuration command contains the target gamma curve parameters. After parsing the command, the controller of the gamma correction circuit calls the calibration parameters pre-stored in the reprogrammable memory, or directly generates real-time calibration parameters dynamically according to the command. The first digital-to-analog converter (DAC) register converts the digital calibration parameters into corresponding analog reference voltages. After the signal driving capability is adjusted by the programmable gamma buffer, multiple analog reference signals are output, corresponding to the driving voltage requirements of different gray levels of the display panel. At the same time, the second DAC register of the reference circuit generates a global reference voltage. After being amplified / filtered by the programmable reference amplifier, it provides a stable reference voltage for multiple gamma reference circuits, ensuring the consistency of voltages at each gray level. Finally, the analog reference signals processed by the buffer and reference amplifier directly act on the driving circuit of the display panel, adjusting the pixel voltages corresponding to different input gray levels, compensating for the inherent input voltage-brightness nonlinearity of the display panel, and making the actual displayed brightness curve fit the target gamma curve parameters.

[0073] Further reference Figure 1As shown, the main control board module 30 further includes a communication module, which includes a 4G / 5G communication module 33 and / or a WiFi communication module 34. The 4G / 5G communication module 33 is electrically connected to the main controller 31 via a UART (Universal Asynchronous Receiver / Transmitter), Serial Peripheral Interface (SPI), or Universal Serial Bus (USB) interface. The WiFi communication module 34 is connected via a UART, SPI, Secure Digital Input / Output (SDIO), or I / O interface. 2 The C bus interface is electrically connected to the main controller 31.

[0074] In one embodiment, the LVDS high-speed interface includes one pair of differential clock lines and at least four pairs of differential data lines.

[0075] In one embodiment, the main control board module 30 is further provided with an expansion interface 35, which includes at least one of a universal asynchronous transceiver interface, a serial peripheral interface, an I2C or GPIO interface, for connecting external sensors or peripherals.

[0076] In one embodiment, further reference is made to Figure 1 As shown, it also includes a host computer terminal 40, which is connected to the 4G / 5G communication module 33 and WiFi communication module 34 of the main control board module 30 via a network. The host computer terminal 40 acts as a server and interacts with the system terminal composed of the display panel module 20 and the main control board module 30.

[0077] In summary, the display device provided by this invention integrates an LED backlight driving circuit and a Gamma correction circuit into its panel driver board. This integrated structure reduces the number of discrete components and shortens the signal transmission path. Simultaneously, the pluggable flexible circuit board connection simplifies assembly and facilitates maintenance and replacement. The panel driver board integrates multiple types of interfaces to adapt to various display panels, enhancing compatibility. The LED backlight driving circuit uses an external current-limiting resistor or a dedicated driver chip to reserve a brightness buffer. The Gamma correction circuit calibrates the Gamma value of the display panel through multiple Gamma reference circuits combined with a reference circuit. Furthermore, the main control board is equipped with various expansion interfaces such as 4G / 5G, WiFi communication modules, and UART / SPI, supporting remote data interaction and external sensor connection. It can flexibly adapt to multiple scenarios, improving the device's practicality and expandability.

[0078] In summary, although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the scope of the invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of this invention is defined by the claims.

Claims

1. A display device, characterized by comprising: include: The display panel module includes a display panel, a panel driver board, and a flexible circuit board connecting the two. The panel driver board integrates a backlight driving circuit and a correction circuit. The main control board module includes a main controller and a storage unit, wherein the main controller is electrically connected to the storage unit; The panel driver board also includes an interface circuit, which includes a low-voltage differential signal interface, an embedded display interface, and a serial communication bus interface. The main control board module is connected to the panel driver board through the low-voltage differential signal interface or the embedded display interface to transmit image data, and is connected to the backlight driving circuit and the correction circuit through the serial communication bus interface to transmit control signals.

2. The display device according to claim 1, characterized in that, The backlight driving circuit communicates with the main controller through the serial communication bus interface. The backlight driving circuit receives the dimming command from the main controller through the serial communication bus and outputs an adjustable current to the backlight unit of the display panel.

3. The display device according to claim 2, characterized in that, The backlight driving circuit consists of a constant voltage source connected in series with a current-limiting resistor. The current-limiting resistor is connected in series in the LED light strip circuit. The current is adjusted through the current-limiting resistor to reserve a brightness buffer, and an adjustable current is output to the backlight unit of the display panel.

4. The display device according to claim 2, wherein The backlight driving circuit uses a dedicated LED driver chip, which adjusts the current to reserve a brightness buffer and outputs an adjustable current to the backlight unit of the display panel.

5. The display device according to claim 1, characterized in that, The calibration circuit communicates with the main controller via the serial communication bus interface. It receives image gamma value configuration commands from the main controller via the serial communication bus and calibrates the image gamma value of the display panel. The calibration circuit includes: A multi-channel gamma value reference circuit includes multiple first digital-to-analog converter registers and multiple programmable buffers, with each buffer connected to the output of one of the first digital-to-analog converter registers; A reference circuit includes a second digital-to-analog converter register and a programmable reference amplifier connected to the output of the second digital-to-analog converter register; The reprogrammable memory is connected to the serial communication bus interface, the first digital-to-analog converter register, and the second digital-to-analog converter register.

6. The display device according to claim 1, characterized in that, The main control board module also includes a communication module. The communication module includes a 4G / 5G communication module and / or a WiFi communication module. The 4G / 5G communication module is electrically connected to the main controller through a universal asynchronous transceiver interface, a serial peripheral interface, or a universal serial bus interface. The WiFi communication module is electrically connected to the main controller via an asynchronous transceiver interface, a serial peripheral interface, a secure digital input / output interface, or a serial communication bus interface.

7. The display device according to claim 1, characterized in that, The low-voltage differential signal interface includes one pair of differential clock lines and at least four pairs of differential data lines.

8. The display device according to claim 1, characterized in that, The main control board module is also provided with an expansion interface, which includes at least one of a universal asynchronous transceiver interface, a serial peripheral interface, an inter-integrated circuit bus interface, or a universal input / output interface, for connecting external sensors or peripherals.

9. The display device according to claim 1, characterized in that, One end of the flexible circuit board is connected to the substrate of the display panel, and the other end is connected to the panel driver board through a pluggable interface.

10. The display device according to claim 6, wherein It also includes a host computer terminal, which is connected to the 4G / 5G communication module and WiFi communication module of the main control board module through a universal serial bus interface or network.

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