Lamp-drive integrated chip, column drive circuit, display panel and display device

Abstract

The embodiment of the invention provides a lamp-drive integrated chip, a column drive circuit, a display panel and a display device, relates to the technical field of display, and is used for realizing open and short circuit detection on a light emitting diode in the display device in an active matrix type drive mode. A lamp-drive integrated chip in the display device is coupled with a column drive circuit, the lamp-drive integrated chip comprises a pixel drive circuit and LEDs, and the pixel drive circuit is correspondingly coupled with the LEDs. The column driving circuit outputs a first column selection signal, the pixel driving circuit responds to the first column selection signal and outputs a detection signal corresponding to the LED, and the detection signal is used for representing the fault state of the LED.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a lamp-driver integrated chip, a column driver circuit, a display panel, and a display device. Background Art

[0002] During the long-term operation of a light-emitting diode (LED) display device, the lamp beads in the LED display device are easily affected by the length of use and environmental factors. Problems such as dust accumulation, excessive humidity, and component corrosion can cause the LED to open or short-circuit. Once a short circuit occurs, the abnormal current will instantly break down the components, causing the power supply module to overload, leading to the burning of the driver chip and lamp beads in the LED display device. In severe cases, it may cause a fire due to local overheating. If the LED is open-circuited, a certain color will be fully lit or not, causing color cast on the display screen, which greatly affects the display effect and safety of use. It can be seen that open and short circuit detection, as a key link in the maintenance of LED display devices, can not only avoid the interference of sudden failures on business, but also effectively extend the service life of the equipment through early intervention.

[0003] With technological development, active matrix (AM) LED display devices have gradually emerged. However, this type of display screen has a technical gap in open and short circuit detection, making it difficult to ensure its normal operation and maintenance. There is an urgent need for an open and short circuit detection solution suitable for active matrix drive LED display devices. Summary of the Invention

[0004] The purpose of the embodiments of the present disclosure is to provide a lamp-driver integrated chip, a column driver circuit, a display panel, and a display device.

[0005] To achieve the above objectives, the embodiments of the present disclosure provide the following technical solutions:

[0006] According to a first aspect of an embodiment of the present application, a display device is provided. The display device includes a light-driven integrated chip and a column driver circuit, wherein the light-driven integrated chip is coupled to the column driver circuit. The light-driven integrated chip includes a pixel driver circuit and a plurality of light-emitting diodes, wherein the pixel driver circuits are respectively coupled to the plurality of light-emitting diodes. The column driver circuit is configured to output a first column selection signal. The pixel driver circuit is configured to respond to the first column selection signal and output a detection signal corresponding to the light-emitting diode, wherein the detection signal is used to indicate the operating state of the light-emitting diode. The column driver circuit is further configured to determine a detection result in response to the detection signal.

[0007] The display device provided by the embodiment of the present application improves the integrated lamp driver chip and the column driver circuit so that the column driver circuit can send a first column selection signal to the integrated lamp driver chip. At the same time, the integrated lamp driver chip can respond to the column selection command and output a detection signal after detecting the light-emitting diode to be tested in response to the detection command. The column driver circuit can determine the state detection result of the light-emitting diode to be tested in response to the detection signal, so as to judge whether the light-emitting diode is in a normal working state, an open circuit state or a short circuit state. Based on this, the detection of the working state of the light-emitting diode in the integrated lamp driver chip in the AM mode can be realized. In addition, the coupling circuit between the pixel driver circuit and the light-emitting diode, as well as the coupling circuit between the column driver circuit and the integrated lamp driver chip, can reuse the original coupling circuit of the display device, without the need for additional changes to the coupling circuit, with small process changes and high feasibility of the solution.

[0008] In one possible implementation, the first-column selection signal is a digital signal, and the detection signal is an analog signal. Transmitting the first-column selection signal as a digital signal facilitates carrying a detection command within the first-column selection signal. Transmitting the detection signal as an analog signal facilitates determining various states of the light-emitting diodes.

[0009] In one possible implementation, the integrated lamp-driver chip further includes a first bidirectional input / output interface for inputting a first column selection signal and outputting a detection signal. The first bidirectional input / output interface can both receive the first column selection signal and output a detection signal. That is, the first bidirectional input / output interface can dynamically switch between input and output functions. Implementing signal input and output through a single interface effectively reduces the number of interfaces in the integrated lamp-driver chip, optimizes the layout, and reduces hardware costs.

[0010] In one possible implementation, the pixel driving circuit further includes multiple gating circuits and a first control circuit. The multiple gating circuits are coupled to the multiple light-emitting diodes, and the multiple gating circuits are also respectively coupled to a first bidirectional input / output interface. The first control circuit is respectively coupled to the first bidirectional input / output interface and the multiple gating circuits; the first control circuit is configured to output a detection signal to the first bidirectional input / output interface in response to a first column selection signal. The pixel driving circuit includes multiple gating circuits and a first control circuit, and the gating circuits are controlled by the first control circuit and coupled to the light-emitting diodes. Under the control of the first control circuit, the gating circuits can drive the light-emitting diodes and also output detection signals for the light-emitting diodes. That is, the gating circuits can achieve normal driving of the light-emitting diodes and also detect the status of the light-emitting diodes. Achieving both driving and detecting functions with a simple structure can simplify the structure of the integrated light-driver chip. Having multiple gating circuits controlled by the same first control circuit can further simplify the structure of the integrated light-driver chip.

[0011] In one possible implementation, the first control circuit is further configured to, in response to the first column selection signal, control the first bidirectional input / output interface to switch from receiving the first column selection signal to outputting the detection signal. Controlling the operating state of the first bidirectional input / output interface via the first control circuit eliminates the need for external signals and reduces circuit complexity.

[0012] In one possible implementation, the first control circuit is further configured to, after controlling the first bidirectional input / output interface to output a detection signal, control the first bidirectional input / output interface to receive a signal sent by the column driver circuit after a first predetermined period of time. By configuring the control logic to automatically control the operating state of the first bidirectional input / output interface after the first predetermined period of time, this eliminates the need for specific external control signals, reduces the number of signals, and simplifies the control logic.

[0013] In one possible implementation, the column driver circuit is further configured to output a second column selection signal, and the pixel driver circuit is further configured to drive the light-emitting diode to emit light in response to the second column selection signal. The integrated light driver chip can also enter a normal driving mode in response to the second column selection signal transmitted by the column driver circuit to implement display functions.

[0014] In one possible implementation, the gating circuit includes a first switching circuit, a second switching circuit, and a current source, and the first column selection signal carries a detection command and a column selection command. The first switching circuit is coupled to the light-emitting diode and the first bidirectional input / output interface, respectively, and the second switching circuit and the current source are coupled in series between the light-emitting diode and the first voltage terminal. The first control circuit is also coupled to the first switching circuit and the second switching circuit, respectively, and is configured to control the on / off state of the first switching circuit according to the detection command, and to control the on / off state of the second switching circuit according to the column selection command. The gating circuit includes the first switching circuit and the second switching circuit. When the first switching circuit is off and the second switching circuit is on, the pixel driving circuit can be used to drive the light-emitting diode to emit light. When both the first switching circuit and the second switching circuit are on, the detection signal of the light-emitting diode can be transmitted to the first bidirectional input / output interface via the first switching circuit, thereby acquiring the state of the light-emitting diode. In other words, by controlling the on / off state of the first switching circuit, the detection signal can be output. This has a simple structure and a simple principle.

[0015] In one possible implementation, the first switching circuit includes a transistor. A first electrode of the transistor is coupled to a light-emitting diode, a second electrode of the transistor is coupled to a first bidirectional input / output interface, and a control electrode of the transistor is coupled to the first control circuit. Using the first transistor to control the on / off connection between the light-emitting diode and the first bidirectional input / output interface results in a simple structure and principle. Furthermore, when the second switching circuit includes a second transistor, the first and second transistors can be fabricated simultaneously, simplifying the process and reducing costs.

[0016] In one possible implementation, the column driver circuit includes a second bidirectional input / output interface, which is used to output the first column selection signal and also to receive a detection signal. The column driver circuit includes a second bidirectional input / output interface, which is used to output the first column selection signal carrying a detection command and a column selection command, and also to receive the detection signal. The second bidirectional input / output interface can dynamically switch between input and output functions, effectively reducing the number of pins in the column driver circuit, optimizing the layout, and lowering hardware costs.

[0017] In one possible implementation, the column driver circuit further includes a second control circuit. The second control circuit is coupled to the second bidirectional input / output interface and is configured to control the second bidirectional input / output interface to switch from outputting the first column selection signal to receiving the detection signal after the second bidirectional input / output interface outputs the first column selection signal. Controlling the operating state of the second bidirectional input / output interface by the second control circuit eliminates the need for external signals and reduces circuit complexity.

[0018] In one possible implementation, the second control circuit is further configured to, after controlling the second bidirectional input / output interface to receive the detection signal, control the second bidirectional input / output interface to output the signal after a second predetermined period of time. By configuring the control logic to automatically control the second bidirectional input / output interface to change its operating state after the second predetermined period of time, this eliminates the need for external control signals, reduces the number of signals, and simplifies the control logic.

[0019] In one possible implementation, the column driver circuit further includes a voltage comparator. A first input of the voltage comparator is coupled to the second bidirectional input / output interface, a second input of the voltage comparator is configured to receive a reference voltage, and an output of the voltage comparator is coupled to a second control circuit. The second control circuit determines a detection result in response to a signal output by the voltage comparator. Using the comparison logic of the voltage comparator to determine the detection result results in a simple circuit structure, simple detection logic, and high detection speed.

[0020] In one possible implementation, if the reference voltage is less than a set value, the test result indicates whether the circuit is open. If the reference voltage is greater than the set value, the test result indicates whether the circuit is short. Alternatively, if the reference voltage is greater than the set value, the test result indicates whether the circuit is open. If the reference voltage is less than the set value, the test result indicates whether the circuit is short. This simple judgment logic helps further improve detection speed.

[0021] A second aspect of an embodiment of the present application provides a chip that integrates a light source and a driver. The chip includes a pixel driver circuit and a plurality of light-emitting diodes, wherein the pixel driver circuit is coupled to each of the plurality of light-emitting diodes. The pixel driver circuit includes a first bidirectional input / output interface configured to receive a first column selection signal. The pixel driver circuit is configured to respond to the first column selection signal and output a detection signal corresponding to the light-emitting diode from the first bidirectional input / output interface. The detection signal is configured to indicate a fault condition of the light-emitting diode.

[0022] In the integrated lamp-driver chip provided in the embodiment of the present application, the pixel driving circuit and the multiple light-emitting diodes are coupled respectively to realize independent driving of the multiple light-emitting diodes. That is, the integrated lamp-driver chip is an integrated lamp-driver chip in an active matrix driving mode. On this basis, the pixel driving circuit is used to receive a first column selection signal carrying a detection command and a column selection command. In response to the column selection command, the pixel driving circuit drives one of the multiple light-emitting diodes to emit light. In response to the detection command, the pixel driving circuit outputs a detection signal after detecting the selected light-emitting diode. The detection signal can be used to determine whether the light-emitting diode is in a normal working state, an open circuit state or a short circuit state. Based on this, the integrated lamp-driver chip in the AM mode can realize the detection of the open and short circuit states of the light-emitting diode.

[0023] In one possible implementation, the integrated lamp-driver chip further includes a first bidirectional input / output interface for inputting a first column selection signal and outputting a detection signal. The first bidirectional input / output interface can both receive the first column selection signal and output a detection signal. That is, the first bidirectional input / output interface can dynamically switch between input and output functions. Implementing signal input and output through a single interface effectively reduces the number of interfaces in the integrated lamp-driver chip, optimizes the layout, and reduces hardware costs.

[0024] In one possible implementation, the pixel driving circuit further includes multiple gating circuits and a first control circuit. The multiple gating circuits are coupled to the multiple light-emitting diodes, and the multiple gating circuits are also respectively coupled to a first bidirectional input / output interface. The first control circuit is respectively coupled to the first bidirectional input / output interface and the multiple gating circuits; the first control circuit is configured to respond to a first column selection signal and output a detection signal to the first bidirectional input / output interface. The pixel driving circuit includes multiple gating circuits and a first control circuit, and the gating circuits are controlled by the first control circuit and coupled to the light-emitting diodes. Under the control of the first control circuit, the gating circuits can drive the light-emitting diodes and also output detection signals for the light-emitting diodes. That is, the gating circuits can achieve normal driving of the light-emitting diodes and also detect the status of the light-emitting diodes. Achieving both driving and detecting functions with a simple structure can simplify the structure of the integrated light-driver chip. Having multiple gating circuits controlled by the same first control circuit can further simplify the structure of the integrated light-driver chip.

[0025] In one possible implementation, the first control circuit is further configured to, in response to the first column selection signal, control the first bidirectional input / output interface to switch from receiving the first column selection signal to outputting the detection signal. Controlling the operating state of the first bidirectional input / output interface via the first control circuit eliminates the need for external signals and reduces circuit complexity.

[0026] In one possible implementation, the first control circuit is further configured to, after controlling the first bidirectional input / output interface to output a detection signal, control the first bidirectional input / output interface to receive a signal sent by the column driver chip after a first predetermined period of time. By configuring the control logic to automatically control the operating state of the first bidirectional input / output interface after the first predetermined period of time, this eliminates the need for specific external control signals, reduces the number of signals, and simplifies the control logic.

[0027] In one possible implementation, the gating circuit includes a first switching circuit, a second switching circuit, and a current source, and the first column selection signal carries a detection command and a column selection command. The first switching circuit is coupled to the light-emitting diode and the first bidirectional input / output interface, respectively, and the second switching circuit and the current source are coupled in series between the light-emitting diode and the first voltage terminal. The first control circuit is also coupled to the first switching circuit and the second switching circuit, respectively, and is configured to control the on / off state of the first switching circuit according to the detection command and the on / off state of the second switching circuit according to the column selection command. The gating circuit includes the first switching circuit and the second switching circuit. When the first switching circuit is off and the second switching circuit is on, the pixel driving circuit can be used to drive the light-emitting diode to emit light. When both the first switching circuit and the second switching circuit are on, the detection signal of the light-emitting diode can be transmitted to the first bidirectional input / output interface via the first switching circuit, thereby acquiring the state of the light-emitting diode. In other words, by controlling the on / off state of the first switching circuit, the detection signal can be output. This has a simple structure and a simple principle.

[0028] In one possible implementation, the first switching circuit includes a transistor. A first electrode of the transistor is coupled to a light-emitting diode, a second electrode of the transistor is coupled to a first bidirectional input / output interface, and a control electrode of the transistor is coupled to the first control circuit. Using the first transistor to control the on / off connection between the light-emitting diode and the first bidirectional input / output interface results in a simple structure and principle. Furthermore, when the second switching circuit includes a second transistor, the first and second transistors can be fabricated simultaneously, simplifying the process and reducing costs.

[0029] In one possible implementation, the first bidirectional input / output interface is further configured to receive a second column selection signal, which carries a column selection command. The pixel driver circuit is configured to drive the light-emitting diode (LED) to emit light in response to the second column selection signal. The integrated light-driver chip can also enter a normal drive mode in response to the second column selection signal to implement display functionality.

[0030] A third aspect of the present application provides a column driver circuit. The column driver circuit includes a second bidirectional input / output interface for coupling to a light-driver integrated chip including a light-emitting diode (LED). The second bidirectional input / output interface is configured to output a first column selection signal and receive a detection signal indicating whether the LED is functioning properly. The column driver circuit is configured to determine a detection result in response to the detection signal.

[0031] The column driver circuit provided in the embodiment of the present application can issue a first column selection signal carrying a detection command and a column selection command, and can confirm the detection result based on the detection signal. That is, the column driver circuit can determine whether the light-emitting diode is in a normal working state, an open circuit state or a short circuit state, so as to realize the detection of the open-circuit and short-circuit state of the light-emitting diode in the integrated lamp-driver chip coupled to the column driver circuit.

[0032] In one possible implementation, the column driver circuit includes a second bidirectional input / output interface, which is used to output the first column selection signal and also to receive a detection signal. The column driver circuit includes a second bidirectional input / output interface, which is used to output the first column selection signal and also to receive a detection signal. The second bidirectional input / output interface can dynamically switch between input and output functions, effectively reducing the number of pins in the column driver circuit, optimizing the layout, and lowering hardware costs.

[0033] In one possible implementation, the column driver circuit further includes a second control circuit. The second control circuit is coupled to the second bidirectional input / output interface and is configured to control the second bidirectional input / output interface to switch from outputting the first column selection signal to receiving the detection signal after the second bidirectional input / output interface outputs the first column selection signal. Controlling the operating state of the second bidirectional input / output interface by the second control circuit eliminates the need for external signals and reduces circuit complexity.

[0034] In one possible implementation, the second control circuit is further configured to, after controlling the second bidirectional input / output interface to receive the detection signal, control the second bidirectional input / output interface to output the signal after a second predetermined period of time. By configuring the control logic to automatically control the second bidirectional input / output interface to change its operating state after the second predetermined period of time, this eliminates the need for external control signals, reduces the number of signals, and simplifies the control logic.

[0035] In one possible implementation, the column driver circuit further includes a voltage comparator. A first input of the voltage comparator is coupled to the second bidirectional input / output interface, a second input of the voltage comparator is configured to receive a reference voltage, and an output of the voltage comparator is coupled to a second control circuit. The second control circuit determines a detection result in response to a signal output by the voltage comparator. Using the comparison logic of the voltage comparator to determine the detection result results in a simple circuit structure, simple detection logic, and high detection speed.

[0036] In one possible implementation, if the reference voltage is less than a set value, the test result indicates whether the circuit is open. If the reference voltage is greater than the set value, the test result indicates whether the circuit is short. Alternatively, if the reference voltage is greater than the set value, the test result indicates whether the circuit is open. If the reference voltage is less than the set value, the test result indicates whether the circuit is short. This simple judgment logic helps further improve detection speed.

[0037] In one possible implementation, the second bidirectional input / output interface is further configured to output a second column selection signal, which carries a column selection command. The column driver circuit may also transmit the second column selection signal to the integrated lamp driver chip to drive the integrated lamp driver chip into a normal driving mode to implement display functionality.

[0038] A fourth aspect of the present application provides a display panel comprising the integrated lamp-driver chip according to the second aspect of the present application, wherein a plurality of integrated lamp-driver chips are arranged in multiple rows and columns.

[0039] The display panel provided in the embodiment of the present application includes the integrated lamp-driver chip of the second aspect, and its beneficial effects are the same as those of the integrated lamp-driver chip, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. Furthermore, the drawings described below can be considered schematic diagrams.

[0041] Figure 1 A schematic diagram of a display device provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of the structure of a driver chip provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the structure of a lamp-driver integrated chip provided in an embodiment of the present application;

[0044] Figure 4 A schematic structural diagram of another integrated lamp-driver chip provided in an embodiment of the present application;

[0045] Figure 5 A schematic structural diagram of another integrated lamp-driver chip provided in an embodiment of the present application;

[0046] Figure 6 A schematic structural diagram of another integrated lamp-driver chip provided in an embodiment of the present application;

[0047] Figure 7 A schematic structural diagram of a column driver circuit provided in an embodiment of the present application;

[0048] Figure 8 A schematic structural diagram of another column driving circuit provided in an embodiment of the present application;

[0049] Figure 9 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0050] Figure 10 Schematic diagram of the coupling relationship between a lamp-driver integrated chip and row and column driver circuits provided in an embodiment of the present application.

[0051] Figure numerals: 1000, pixel driving circuit; 10, current source; 20, transistor; 30, voltage comparator; 40, control circuit; 50, pin; 11, first pin; 12, second pin; 13, selection circuit 131, first switching circuit; 132, first switching circuit; 14, first control circuit; 2000, column driving circuit; 21, third pin; 23, second control circuit; 3000, integrated lamp driving chip; 41, fifth pin; 51, fourth pin; 4000, display panel; 5000, display device; 6000, row driving circuit; 500, driving chip; T1, first transistor; T2, second transistor; V1, first voltage terminal; V ref , reference voltage; VLED, power supply voltage terminal. DETAILED DESCRIPTION

[0052] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the embodiments described are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0053] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as having an open, inclusive meaning, that is, "including, but not limited to." In the description of the specification, the terms "one embodiment," "some embodiments," "exemplary embodiments," "examples," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the particular features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0054] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0055] When describing some embodiments, the terms "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" may also mean that two or more components are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0056] “At least one of A, B and C” has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0057] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0058] As used herein, "equal" includes the stated conditions and conditions that are similar to the stated conditions, where the range of the similar conditions is within an acceptable range of deviation, where the acceptable range of deviation is determined by one of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system). For example, "equal" includes absolute equality and approximate equality, where the acceptable range of deviation for approximate equality can be, for example, that the difference between the two is less than or equal to 5% of either.

[0059] In this disclosure, terms such as "lower," "below," "above," and "upper," and similar terms are used to explain the relationships between components shown in the drawings. These terms may be relative and described based on directions shown in the drawings, or based on the order in which process steps are formed, but are not limited thereto.

[0060] It will be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present therebetween.

[0061] In the embodiments of the present disclosure, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present disclosure should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0062] In addition, in the circuits provided in the embodiments of the present disclosure, transistors are described using P-type transistors as an example. It should be noted that the embodiments of the present disclosure include but are not limited to this. For example, one or more transistors in the circuits provided in the embodiments of the present disclosure may also be N-type transistors. It is only necessary to connect the respective poles of the selected type of transistor accordingly with reference to the respective poles of the corresponding transistors in the embodiments of the present disclosure, and to make the corresponding voltage terminals provide the corresponding high voltage or low voltage.

[0063] An embodiment of the present application provides a display device, which may be any device that displays either moving (eg, video) or fixed (eg, still image) content, and either text or images.

[0064] Exemplarily, the display device can be an electronic billboard, a shopping mall display, a sign, a television, a computer, an aircraft display, a car display, a clock, a virtual reality (VR) device, an augmented reality (AR) device, or any other product or component with a display function.

[0065] Figure 1 A schematic diagram of a display device provided in an embodiment of the present application.

[0066] In some embodiments, as Figure 1 As shown, the display device 5000 may be a flat display device; for example, the display device 5000 may be an electronic billboard, a television, or the like.

[0067] In some embodiments, the display device 5000 may include one or more display panels 4000. The number of the display panels 4000 may be set as needed.

[0068] Figure 2 A schematic diagram of the structure of a driver chip provided in an embodiment of the present application.

[0069] In some embodiments, as Figure 2 As shown, the driver chip 500 includes a pin 50, and multiple light-emitting diodes (LEDs) are coupled to the same pin 50 and connected to the actual driver chip 500 through the pin 50. For example, the light-emitting diodes (LEDs) are coupled between the power supply voltage terminal VLED and the pin 50. It should be noted that the number of LEDs connected to the driver chip 500 in this embodiment is not limited to three, and can be a matrix of LEDs with multiple rows and columns. Only three LEDs are used as an example in the figure. In addition, the driver chip 500 in this embodiment is a passive matrix (PM) driver chip, and the driver chip 500 and the LEDs are separately packaged.

[0070] For example, the driver chip 500 includes a current source 10 , a transistor 20 , a voltage comparator 30 , a control circuit 40 , and a pin 50 .

[0071] The control electrode of transistor 20 is used to receive a switching signal. The first electrode of transistor 20 is electrically connected to current source 10, and the second electrode of transistor 20 is electrically connected to pin 50. Current source 10 is also electrically connected to reference ground voltage terminal GND. Current source 10 is used to provide a stable current to driver chip 500.

[0072] The transistor 20 is used to respond to the switch signal and control the connection between the current source 10 and the pin 50 to achieve the purpose of controlling the light emitting diode LED to be turned on or off.

[0073] The first input terminal of the voltage comparator 30 is electrically connected to the pin 50, and the second input terminal of the voltage comparator 30 is used to receive the reference voltage V ref , the output end of the voltage comparator 30 is electrically connected to the control circuit 40 .

[0074] The voltage comparator 30 is used to receive the reference voltage V ref The actual voltage transmitted by pin 50 is the reference voltage V ref The voltage is compared with the actual voltage, and the comparison result is transmitted to the control circuit 40. The control circuit 40 makes an open-circuit or short-circuit judgment based on the comparison result.

[0075] During the process of driving the light emitting diodes by the driver chip 500 , the driver chip 500 drives the multiple light emitting diodes LED in the same row to switch on and off synchronously.

[0076] Figure 2 The driver chip 500 performs an open-short circuit detection method on the light emitting diode as follows: when the received switch signal is an on signal, if the light emitting diode LED emits light normally, there will be a voltage drop V at both ends of the light emitting diode LED. f_led , the voltage at pin 50 V 50 =V LED -V f_led , V LED The voltage comparator 30 is used to compare the actual voltage V 50 and reference voltage V ref Make a comparison.

[0077] When short circuit detection is performed, the second input terminal of the voltage comparator 30 receives the reference voltage V ref =V LED -V th Among them, V th The threshold voltage can be adjusted to V ref The value of V ref >V50 (V LED -V f_led ). When the light emitting diode LED is short-circuited, the voltage V 50 =V LED , at this time V 50 =V LED >V ref The voltage comparator 30 is used to compare the actual voltage V 50 and reference voltage V ref Compare (V 50 -V ref ), the comparison result is greater than 0. The output terminal of the voltage comparator 30 outputs a high level (or a low level). On the contrary, when the light emitting diode LED is working normally, V ref >V 50 (V LED -V f_led ), the voltage comparator 30 compares the actual voltage V 50 and reference voltage V ref Compare (V 50 -V ref ), the comparison result is less than 0. The output terminal of the voltage comparator 30 outputs a low level (or a high level). The control circuit 40 can determine whether the light emitting diode LED is short-circuited based on the high and low levels output by the voltage comparator 30.

[0078] When open circuit detection is performed, the reference voltage V ref =V LED -V th At this time, the threshold voltage V th The size of V ref <V 50 (V LED -V f_led ). When the light emitting diode LED is open circuit, the voltage V 50 Close to 0V, V ref >V 50 (0V). The voltage comparator 30 compares the actual voltage V 50 and reference voltage V ref Compare (V 50 -V ref ), the comparison result is less than 0. The output terminal of the voltage comparator 30 outputs a high level (or a low level). When the light emitting diode LED is working normally, V ref <V 50 (V LED -V f_led ). The voltage comparator 30 compares the actual voltage V 50 and reference voltage V ref Compare (V50 -V ref ), the comparison result is greater than 0. The output terminal of the voltage comparator 30 outputs a low level (or a high level).

[0079] The connection mode of the above-mentioned light emitting diodes LED is common anode connection. When the light emitting diodes LED are common cathode connection, the logic is opposite to the above process.

[0080] Open and short circuit detection is a core part of the maintenance of the display device 5000. It can not only avoid the impact of sudden failures on business, but also significantly extend the life of the equipment through early intervention. At present, the open and short circuit detection solution of the display device 5000 using the PM type driver chip 500 is relatively mature. It requires the software, sending card, receiving card, and driver chip to cooperate with each other to obtain the information of the light-emitting diode LED open and short circuit, so as to help maintenance personnel quickly locate the problem point, fix the problem in time, and prevent the problem from escalating. For example, Figure 2 The driver chip 500 shown can use the above detection method to perform open-circuit and short-circuit detection on the light emitting diode LED.

[0081] However, due to the inconsistency between the topology of an active matrix (AM) driver chip and a PM driver chip 500, the open-circuit and short-circuit detection method for the PM driver chip 500 cannot be applied to the AM driver chip. Therefore, a method for detecting open-circuit and short-circuit LEDs (LEDs) in a display device 5000 that includes an AM driver chip is needed.

[0082] Figure 3 This is a schematic diagram of the structure of a lamp-driver integrated chip provided in an embodiment of the present application.

[0083] An embodiment of the present application provides an integrated lamp-driver chip 3000 , which can be used in an AM mode, for example.

[0084] In some embodiments, as Figure 3 As shown, the integrated lamp-driver chip 3000 includes a pixel driving circuit 1000 and a plurality of light-emitting diodes LEDs, and the pixel driving circuit 1000 is coupled to the plurality of light-emitting diodes LEDs respectively.

[0085] The pixel driving circuit 1000 is coupled to the plurality of light-emitting diodes (LEDs) in a corresponding manner, which can be understood as the pixel driving circuit 1000 being coupled to the plurality of light-emitting diodes (LEDs) in a corresponding manner via different ports. That is, the plurality of light-emitting diodes (LEDs) are coupled to different ports of the pixel driving circuit 1000 to enable the pixel driving circuit 1000 to independently drive the plurality of light-emitting diodes (LEDs).

[0086] For example, the plurality of light emitting diodes LED include a red light emitting diode, a green light emitting diode and a blue light emitting diode. Alternatively, for example, the plurality of light emitting diodes LED are all light emitting diodes of the same color.

[0087] For example, Figure 3 As shown, the pixel driving circuit 1000 includes a plurality of second pins 12, which are used to couple the pixel driving circuit 1000 to the light-emitting diodes LED. The cathodes of the plurality of light-emitting diodes LED are respectively coupled to the plurality of second pins 12, and the anodes of the light-emitting diodes LED are used to receive a power supply voltage. For example, the anodes of the light-emitting diodes LED are used to couple to the power supply voltage terminal VLED.

[0088] The embodiment of the present application does not limit the number and color of the light-emitting diodes LEDs that the pixel driving circuit 1000 can carry. Figure 3 The figure is for reference only.

[0089] The pixel driving circuit 1000 is configured to respond to the first column selection signal and output a detection signal corresponding to the light emitting diode LED.

[0090] For example, the first column selection signal carries a detection command and a column selection command. The detection command may include an open circuit detection command or a short circuit detection command. For example, in a first column selection signal, only one of the open circuit detection command and the short circuit detection command is carried, and both commands are not carried at the same time.

[0091] In some embodiments, the first column selection signal is a digital signal and the detection signal is an analog signal. The digital signal may also be referred to as a digital level signal.

[0092] The first column selection signal is transmitted in the form of a digital signal, so that the first column selection signal carries a detection command. The detection signal is transmitted in the form of an analog signal, so that various states of the light emitting diodes can be judged.

[0093] The first column selection signal carries a detection command, and the pixel driving circuit 1000 can determine that the current moment is not limited to driving the light-emitting diode (LED), but also requires detecting the status of the light-emitting diode (LED). Based on the column selection command carried in the first column selection signal, the pixel driving circuit 1000 can determine which light-emitting diode (LED) among the multiple light-emitting diodes (LED) currently needs to be detected.

[0094] Based on this, the pixel driving circuit 1000 can drive the selected light-emitting diode (LED), and the light-emitting diode (LED) will have different responses in different states. For example, when the light-emitting diode (LED) is normal, the light-emitting diode (LED) emits light normally, and the voltage at the cathode of the light-emitting diode (LED) is the difference between the power supply voltage and the voltage drop of the light-emitting diode (LED). When the light-emitting diode (LED) is abnormal, the light-emitting diode (LED) emits light abnormally, and the voltage at the cathode of the light-emitting diode (LED) is not equal to the difference between the power supply voltage and the voltage drop of the light-emitting diode (LED). For example, when the light-emitting diode (LED) is short-circuited, the voltage at the cathode of the light-emitting diode (LED) is the power supply voltage. When the light-emitting diode (LED) is open-circuited, the voltage at the cathode of the light-emitting diode (LED) is 0.

[0095] Therefore, the pixel driving circuit 1000 outputs the signal of the cathode of the light emitting diode LED as a detection signal, and the column driving circuit recognizes the detection signal to determine the state of the light emitting diode LED.

[0096] In some embodiments, the pixel driving circuit 1000 is further configured to receive a second column selection signal. In response to the second column selection signal, which carries a column selection command, the pixel driving circuit 1000 only drives the selected light-emitting diode (LED) to emit light, and does not detect the status of the selected light-emitting diode (LED).

[0097] In the integrated lamp-driver chip 3000 provided in the embodiment of the present application, the pixel driving circuit 1000 and the multiple light-emitting diodes LED are respectively coupled to realize independent driving of the multiple light-emitting diodes LED. That is, the integrated lamp-driver chip 3000 is an integrated lamp-driver chip 3000 in active matrix driving (AM) mode. On this basis, the pixel driving circuit 1000 is used to receive a first column selection signal carrying a detection command and a column selection command. In response to the column selection command, the pixel driving circuit 1000 drives one of the multiple light-emitting diodes LED to emit light. In response to the detection command, the pixel driving circuit 1000 outputs a detection signal after detecting the selected light-emitting diode LED. The detection signal can be used to determine whether the light-emitting diode LED is in a normal working state, an open circuit state or a short circuit state. Based on this, the integrated lamp-driver chip 3000 in the AM mode can realize the detection of the open and short circuit states of the light-emitting diode LED.

[0098] Figure 4 This is a structural diagram of another integrated lamp-driver chip provided in an embodiment of the present application.

[0099] In some embodiments, as Figure 4As shown, the integrated lamp driver chip 3000 further includes a first bidirectional input and output interface IO1, which is used to receive a first column selection signal and output a detection signal.

[0100] The first bidirectional input / output interface IO1 can be understood as an interface that can be used to receive signals or send signals. The present embodiment does not limit the structure of the first bidirectional input / output interface IO1, and structures in related technologies are applicable to the present embodiment.

[0101] For example, in the first working state, that is, when the integrated lamp driver chip 3000 enters the detection mode, the first bidirectional input / output interface IO1 is used to receive the first column selection signal. In the second working state, that is, when the integrated lamp driver chip 3000 operates in the detection mode, the first bidirectional input / output interface IO1 is used to send the detection signal.

[0102] In some embodiments, the first bidirectional input / output interface IO1 is further configured to receive a second column selection signal.

[0103] The first bidirectional input / output interface IO1 can receive a first column selection signal and output a detection signal. That is, the first bidirectional input / output interface IO1 can dynamically switch between input and output functions. Implementing both signal input and output through a single interface effectively reduces the number of interfaces in the integrated lamp-driver chip 3000, optimizing the layout and reducing hardware costs.

[0104] In some embodiments, the first bidirectional input / output interface IO1 is integrated into the pixel driving circuit 1000 to simplify the interconnection between the first bidirectional input / output interface IO1 and other internal structures of the pixel driving circuit 1000 .

[0105] In some embodiments, as Figure 4 As shown, the pixel driving circuit 1000 further includes a plurality of gating circuits 13 and a first control circuit 14 .

[0106] The plurality of strobe circuits 13 are coupled to the plurality of light emitting diodes LEDs respectively. The plurality of strobe circuits 13 are also coupled to the first bidirectional input / output interface IO1 respectively.

[0107] For example, the pixel driving circuit 1000 includes a plurality of second pins 12, each of which is coupled to a plurality of light-emitting diodes (LEDs) to achieve respective coupling between the pixel driving circuit 1000 and the plurality of light-emitting diodes (LEDs). Each selection circuit 13 in the pixel driving circuit 1000 is coupled between a second pin 12 and the first bidirectional input / output interface IO1.

[0108] For example, the pixel driving circuit 1000 further includes a first pin 11, which is coupled to a first bidirectional input / output interface IO1. For example, the first bidirectional input / output interface IO1 is configured to output an analog signal (detection signal) to the first pin 11, or the first bidirectional input / output interface IO1 is configured to receive a digital signal (first column selection signal) input by the first pin 11.

[0109] The first control circuit 14 is coupled to the first bidirectional input / output interface IO1 and the plurality of selection circuits 13 , respectively. The first control circuit 14 is configured to output a detection signal to the first bidirectional input / output interface IO1 in response to a first column selection signal.

[0110] The first control circuit 14 controls the corresponding strobe circuit 13 to turn on in response to the column selection command in the first column selection signal, and controls the selected strobe circuit 13 to output the detection result of the light emitting diode LED coupled to the selected strobe circuit 13 .

[0111] In some embodiments, the first control circuit 14 further responds to the second column selection signal to drive the light emitting diode LED to emit light.

[0112] The pixel driving circuit 1000 includes multiple gating circuits 13 and a first control circuit 14. The gating circuits 13 are controlled by the first control circuit 14 and are coupled to the light-emitting diodes (LEDs). Under the control of the first control circuit 14, the gating circuits 13 can drive the light-emitting diodes (LEDs) and also output detection signals for the light-emitting diodes (LEDs). In other words, the gating circuits 13 can both normally drive the light-emitting diodes (LEDs) and detect the status of the light-emitting diodes (LEDs). By implementing both driving and detecting functions with a simple structure, the structure of the integrated light-driver chip 3000 can be simplified. Multiple gating circuits 13 are controlled by the same first control circuit 14, further simplifying the structure of the integrated light-driver chip 3000.

[0113] In some embodiments, the first control circuit 14 is further configured to control the first bidirectional input / output interface IO1 to change from receiving the first column selection signal to outputting a detection signal in response to the first column selection signal.

[0114] For example, the first control circuit 14 is coupled to the first bidirectional input / output interface IO1 and is configured to control whether the first bidirectional input / output interface IO1 is in an operating state of receiving a digital signal from the first pin 11 or in an operating state of sending an analog signal to the first pin 11. The first control circuit 14 is further configured to receive a first column selection signal or a second column selection signal transmitted by the first bidirectional input / output interface IO1 to determine the gating circuit 13 corresponding to the light-emitting diode LED to be detected or driven.

[0115] In some embodiments, the first control circuit 14 may be, for example, a digital logic circuit. The present embodiment does not limit the structure of the first control circuit 14. Any circuit capable of controlling the gating circuit 13 and controlling the operating state of the first bidirectional input / output interface IO1 is applicable to the present embodiment.

[0116] The working state of the first bidirectional input / output interface IO1 is controlled by the first control circuit 14 without requiring an external signal, thereby reducing circuit complexity.

[0117] In some embodiments, the first control circuit 14 is further configured to, after controlling the first input / output interface IO1 to change from receiving the first column selection signal to outputting the detection signal, control the first input / output interface IO1 to receive a signal sent by a column driver chip after a first set period of time. The signal sent by the column driver chip can be either the first column selection signal or the second column selection signal.

[0118] For example, the time period is set to 100 valid clock signals. The default working state of the first input / output interface IO1 is receiving signals, and when it is necessary to output a detection signal (analog signal) of the light emitting diode LED, it will switch to the detection state.

[0119] That is to say, after the first bidirectional input / output interface IO1 changes from the default working state to the detection working state, it will switch back to the default working state after a set period of time. The default working state is to drive the light emitting diode to emit light.

[0120] By setting the control logic to automatically control the working state of the first bidirectional input / output interface IO1 to change after the first set period, it is possible to eliminate the need for external control signals, reduce the number of signals, and simplify the control logic.

[0121] Figure 5 This is a structural diagram of another integrated lamp-driver chip provided in an embodiment of the present application.

[0122] In some embodiments, as Figure 5 As shown, the gating circuit 13 includes a first switch circuit 131 , a second switch circuit 132 and a current source 10 .

[0123] The first switch circuit 131 is coupled to the light emitting diode LED and the first bidirectional input / output interface IO1 respectively. The second switch circuit 132 and the current source 10 are coupled in series between the light emitting diode LED and the first voltage terminal V1. For example, the first voltage terminal V1 is a reference ground voltage terminal.

[0124] For example, if multiple gating circuits 13 are coupled to multiple second pins 12, then one end of the first switch circuit 131 included in each gating circuit 13 is coupled to a different second pin 12. If multiple gating circuits 13 are coupled to the same first bidirectional input / output interface IO1, then the other end of the first switch circuit 131 included in each gating circuit 13 is coupled to the same first bidirectional input / output interface IO1. In other words, the first switch circuit 131 is coupled to the second pin 12 to which it is coupled, and is not coupled to any other second pin 12.

[0125] Similarly, multiple gating circuits 13 are coupled to multiple second pins 12. Thus, one end of the second switch circuit 132 included in each gating circuit 13 is coupled to a different second pin 12. The other ends of the multiple gating circuits 13 are coupled to their respective current sources 10. Thus, the other end of the second switch circuit 132 included in each gating circuit 13 is coupled to its respective current source 10. In other words, the second switch circuit 132 is coupled to the second pin 12 to which it is coupled, and not to any other second pin 12. Similarly, the second switch circuit 132 is coupled to the current source 10 to which it is coupled, and not to any other current source 10.

[0126] The first column selection signal carries a detection command and a column selection command. The first control circuit 14 is also coupled to the first switch circuit 131 and the second switch circuit 132, respectively, and is configured to control the on / off of the first switch circuit 131 according to the detection command, and to control the on / off of the second switch circuit 132 according to the column selection command.

[0127] For example, the first control circuit 14 is coupled to the control terminal of each second switch circuit 132 of the gating circuit 13, and is configured to transmit an on or off signal to each second switch circuit 132. For example, at the same time, the first control circuit 14 transmits an on signal to one second switch circuit 132 and transmits an off signal to the remaining second switch circuits 132. This allows one light-emitting diode (LED) in the integrated lamp-driver chip 3000 to be illuminated while the remaining light-emitting diodes (LED) are turned off, thereby independently driving multiple light-emitting diodes (LEDs).

[0128] The first control circuit 14 is coupled to the control terminal of the first switch circuit 131 of each gating circuit 13 and is configured to transmit an on or off signal to each first switch circuit 131. For example, at the same time, the first control circuit 14 transmits an on signal to the first switch circuit 131 and the second switch circuit 132 in one gating circuit 13, and transmits an off signal to the first switch circuit 131 and the second switch circuit 132 in the remaining gating circuits 13. This enables the state of one light-emitting diode (LED) among the multiple light-emitting diodes (LEDs) of the integrated lamp-driver chip 3000 to be collected independently.

[0129] For example, in the driving mode, the first control circuit 14 controls the second switch circuit 132 to be turned on and controls the first switch circuit 131 to be turned off, so as to drive the light emitting diode LED to emit light.

[0130] In the detection mode, the first control circuit 14 controls the second switch circuit 132 to be turned on, and the first control circuit 14 also controls the first switch circuit 131 to be turned on, transmitting the detection signal of the light emitting diode LED (eg, cathode signal) to the first bidirectional input / output interface IO1.

[0131] The selection circuit 13 includes a first switch circuit 131 and a second switch circuit 132. When the first switch circuit 131 is off and the second switch circuit 132 is on, the pixel driving circuit 1000 can be used to drive the light-emitting diode (LED) to emit light. When both the first switch circuit 131 and the second switch circuit 132 are on, a detection signal from the light-emitting diode (LED) can be transmitted to the first bidirectional input / output interface IO1 via the first switch circuit 131, thereby acquiring the status of the light-emitting diode (LED). In other words, by controlling the on / off state of the first switch circuit 131, the detection signal can be output, resulting in a simple structure and principle.

[0132] Figure 6 This is a structural diagram of another integrated lamp-driver chip provided in an embodiment of the present application.

[0133] In some embodiments, as Figure 6 As shown, the first switch circuit 131 includes a transistor T1 , a first electrode of the transistor T1 coupled to the light emitting diode LED, a second electrode of the transistor T1 coupled to the first bidirectional input / output interface IO1 , and a control electrode of the transistor T1 coupled to the first control circuit 14 .

[0134] For example, the first electrode of the first transistor T1 is coupled to the light emitting diode LED via the second pin 12 .

[0135] The embodiment of the present application does not limit the structure of the first switch circuit 131. Any structure that can realize the function of the first switch circuit 131 is applicable to the embodiment of the present application. For example, the first switch circuit 131 may include a transistor connected in series or in parallel with the first transistor T1. Figure 6 The figure is for reference only.

[0136] In some embodiments, the second switch circuit 132 includes a second transistor T2 .

[0137] A first electrode of the second transistor T2 is coupled to the light emitting diode LED, a second electrode of the second transistor T2 is coupled to the current source 10, and a control electrode of the second transistor T2 is coupled to the first control circuit 14. For example, the first electrode of the second transistor T2 is coupled to the light emitting diode LED via the second pin 12.

[0138] The first transistor T1 is used to control the on / off state between the light-emitting diode LED and the first bidirectional input / output interface IO1. This has a simple structure and principle. Furthermore, when the second switch circuit 132 includes the second transistor T2, the first transistor T1 and the second transistor T2 can be formed simultaneously, resulting in a simple process and low cost.

[0139] The integrated lamp-driver chip 3000 provided in the embodiment of the present application can be applied to the display panel 4000 provided in the embodiment of the present application. The display panel 4000 can include multiple integrated lamp-driver chips 3000, and the multiple integrated lamp-driver chips 3000 are arranged in multiple rows and columns.

[0140] Figure 7 A schematic structural diagram of a column driver circuit provided in an embodiment of the present application.

[0141] In some embodiments, as Figure 7 As shown, column driver circuit 2000 is configured to output a first column selection signal, which carries a detection command and a column selection command. Column driver circuit 2000 is further configured to receive the detection signal and determine a detection result in response to the detection signal. The detection signal is used to indicate whether the light-emitting diode (LED) is operating normally.

[0142] For example, the column driver circuit 2000 is coupled to a lamp-driver integrated chip 3000 including a light-emitting diode (LED). The detection signal is used to indicate the status of the light-emitting diode (LED). For example, the status of the light-emitting diode (LED) includes a normal operating state and an abnormal operating state. For example, the abnormal operating state includes a short circuit state, an open circuit state, etc.

[0143] In some embodiments, the column driver circuit 2000 is configured to output a second column selection signal, which carries a column selection command. At this time, the integrated lamp driver chip 3000 does not feed back a detection signal.

[0144] The column driver circuit 2000 provided in the embodiment of the present application can issue a column selection signal carrying a detection command and a column selection command, and can confirm the detection result based on the detection signal, that is, the column driver circuit 2000 can determine whether the light-emitting diode LED is in a normal working state, an open circuit state or a short circuit state, so as to realize the detection of the open and short circuit states of the light-emitting diode LED in the integrated lamp driver chip 3000 coupled to the column driver circuit 2000.

[0145] Figure 8 A schematic structural diagram of another column driver circuit provided in an embodiment of the present application.

[0146] In some embodiments, as Figure 8 As shown, the column driver circuit 2000 includes a second bidirectional input / output interface IO2. For example, the second bidirectional input / output interface IO2 is used to couple with the integrated lamp driver chip 3000. The second bidirectional input / output interface IO2 is used to output a first column selection signal. The second bidirectional input / output interface IO2 is also used to receive a detection signal, which is used to indicate whether the light-emitting diode (LED) is operating normally.

[0147] For example, the column driver circuit 2000 further includes a third pin 21, which is used to couple with the integrated lamp driver chip 3000. For example, the third pin 21 is used to transmit a digital signal to the first bidirectional input / output interface IO1 in the integrated lamp driver chip 3000. Alternatively, the third pin 21 is used to receive an analog signal transmitted by the first bidirectional input / output interface IO1 in the integrated lamp driver chip 3000.

[0148] The second bidirectional input / output interface IO2 can be understood as an interface that can be used to receive signals or send signals. The present embodiment does not limit the structure of the second bidirectional input / output interface IO2, and structures in related technologies are applicable to the present embodiment.

[0149] For example, the second bidirectional input / output interface IO2 is coupled to the third pin 21. For example, in the first working state, the second bidirectional input / output interface IO2 is used to transmit signals to the third pin 21. In the second working state, the second bidirectional input / output interface IO2 is used to receive signals transmitted by the third pin 21.

[0150] The column driver circuit 2000 includes a second bidirectional input / output interface IO2, which is used to output a first column selection signal carrying a detection command and a column selection command, and is also used to receive the detection signal. The second bidirectional input / output interface IO2 dynamically switches between input and output functions in different operating modes, which can effectively reduce the number of pins in the column driver circuit 2000, optimize the layout, and reduce hardware costs.

[0151] In some embodiments, as Figure 8 As shown, the column driving circuit 2000 further includes a second control circuit 23, which is coupled to the second bidirectional input / output interface IO2 and configured to control the second bidirectional input / output interface IO2 to change from outputting the column selection signal to receiving the detection signal after the second bidirectional input / output interface IO2 outputs the first column selection signal.

[0152] For example, the second control circuit 23 is used to control whether the second bidirectional input / output interface IO2 is in a working state of receiving an analog signal from the third pin 21 or in a working state of sending a digital signal to the third pin 21 .

[0153] The working state of the second bidirectional input / output interface IO2 is controlled by the second control circuit 23 without the need for an external signal, thereby reducing circuit complexity.

[0154] In some embodiments, the second control circuit 23 is further configured to, after controlling the second bidirectional input / output interface IO2 to change from outputting the first column selection signal to receiving the detection signal, control the second bidirectional input / output interface IO2 to output the signal after a second set period of time. The signal can be either the first column selection signal or the second column selection signal.

[0155] For example, the first set period and the second set period have the same duration. For example, the first set period and the second set period are both 100 valid clock signals.

[0156] In the default operating state, the second bidirectional input / output interface IO2 is used to output the second column selection signal (digital signal), and the first bidirectional input / output interface IO1 is used to receive the second column selection signal. In this case, the second column selection signal carries the column selection instruction, which is used to instruct the selected light-emitting diode LED to emit light, and no open-circuit or short-circuit detection is required.

[0157] In the detection working state, the second bidirectional input / output interface IO2 is used to receive a detection signal to implement the above-mentioned open / short circuit detection function.

[0158] By setting the control logic to automatically control the working state of the second bidirectional input / output interface IO2 to change after the second set period, it is possible to eliminate the need for external control signals, reduce the number of signals, and simplify the control logic.

[0159] In some embodiments, the second control circuit 23 is further configured to transmit a first column selection signal or a second column selection signal to the second bidirectional input / output interface IO2, so that the first control circuit 14 in the integrated lamp-driver chip 3000 controls the gating circuit 13 coupled to the light-emitting diode LED to be detected or driven.

[0160] For example, the second control circuit 23 is further configured to transmit a first column selection signal to the second bidirectional input / output interface IO2. The first column selection signal carries a detection command and a column selection command. For example, the detection command includes an open circuit detection command, or the detection command includes a short circuit detection command. This allows the first control circuit 14 in the integrated lamp-driver chip 3000 to control the gating circuit 13 to perform open-circuit and short-circuit detection.

[0161] Alternatively, for example, the second control circuit 23 is further configured to transmit a second column selection signal to the second bidirectional input / output interface IO2, the second column selection signal carrying a column selection command, so that the first control circuit 14 in the integrated lamp-driver chip 3000 controls the gating circuit 13 to perform light-emitting driving.

[0162] In some embodiments, the second control circuit 23 may be, for example, a digital logic circuit. The present embodiment does not limit the structure of the second control circuit 23. Any circuit capable of outputting the first column selection signal and controlling the operating state of the second bidirectional input / output interface IO2 is applicable to the present embodiment.

[0163] In some embodiments, as Figure 8 As shown, the column driving circuit 2000 further includes a voltage comparator 30, a first input terminal of the voltage comparator 30 is coupled to the second bidirectional input / output interface IO2, a second input terminal of the voltage comparator 30 is used to receive a reference voltage, and an output terminal of the voltage comparator 30 is coupled to the second control circuit 23.

[0164] For example, the first input terminal of the voltage comparator 30 is used to receive the analog signal transmitted by the second bidirectional input and output structure IO2. The second input terminal of the voltage comparator 30 is used to receive the reference voltage V ref . Reference voltage V ref For example, it is a variable voltage. In the embodiment of the present application, the reference voltage V ref The voltage comparator 30 is used to compare the received analog signal with the reference voltage V ref For example, the voltage comparator 30 is used to compare the received analog signal with the reference voltage V ref The comparison result is fed back to the second control circuit 23.

[0165] The embodiment of the present application does not limit the structure of the voltage comparator 30 , and the structure of the voltage comparator 30 in the related art is applicable to the embodiment of the present application.

[0166] The second control circuit 23 determines the detection result in response to the signal output by the voltage comparator 30 .

[0167] The detection result is judged by using the comparison logic of the voltage comparator 30 , which has a simple circuit structure, simple detection logic and fast detection speed.

[0168] In some embodiments, the voltage comparator 30 compares the detection signal and the reference voltage V ref For example, the output terminal of the voltage comparator 30 outputs a digital signal, and the digital signal is used to represent the working state of the light emitting diode LED.

[0169] Reference voltage V ref Less than the set value, the detection result is used to indicate whether the circuit is open; the reference voltage V ref If the voltage is greater than the set value, the detection result is used to indicate whether there is a short circuit.

[0170] In some embodiments, the detection command carried in the first column selection signal includes an open circuit detection command, which controls the reference voltage V input to the second input terminal of the voltage comparator 30. ref Less than the set value.

[0171] Optional, set value is V LED -V f_led , where V LED The power supply voltage received by the anode of the light-emitting diode LED, V f_led It is the voltage drop between the anode and cathode when the light-emitting diode LED is emitting light normally.

[0172] For example, when the light emitting diode LED is open circuit, the voltage V at the second pin 12 is 12 Close to 0V, V ref >V 12 (0V). The voltage comparator 30 compares the actual voltage V 12 (detection signal) and reference voltage V ref Compare (V 12 -V ref ), the comparison result is less than 0. The output terminal of the voltage comparator 30 outputs a high level (or a low level). When the light emitting diode LED is working normally, V ref <V 12 (V LED -V f_led ). The voltage comparator 30 compares the actual voltage V 12 (detection signal) and reference voltage V ref Compare (V 12 -V ref ), the comparison result is greater than 0. The output terminal of the voltage comparator 30 outputs a low level (or a high level).

[0173] In other embodiments, the detection command carried in the first column selection signal includes a short circuit detection command, which controls the reference voltage V input to the second input terminal of the voltage comparator 30. ref Greater than the set value.

[0174] Optional, set value is V LED -V f_led , where V LED The power supply voltage received by the anode of the light-emitting diode LED, V f_led It is the voltage drop between the anode and cathode when the light-emitting diode LED is emitting light normally.

[0175] For example, when the light emitting diode LED is short-circuited, the voltage V 12 =V LED , at this time V 12 =V LED >V ref The voltage comparator 30 is used to compare the actual voltage V 12 (detection signal) and reference voltage V ref Compare (V 12 -V ref ), the comparison result is greater than 0. The output terminal of the voltage comparator 30 outputs a high level (or a low level). On the contrary, when the light emitting diode LED is working normally, V ref >V 12 (V LED -V f_led ), the voltage comparator 30 compares the actual voltage V 12 (detection signal) and reference voltage V ref Compare (V 12 -V ref ), the comparison result is less than 0. The output terminal of the voltage comparator 30 outputs a low level (or a high level).

[0176] The second control circuit 23 of the column driving circuit 2000 determines the detection result in response to the digital signal output by the voltage comparator 30 .

[0177] For example, in the open circuit detection state, the second control circuit 23 can determine whether the light emitting diode LED is open circuit according to the high and low level signals output by the voltage comparator 30 .

[0178] For example, the second control circuit 23 recognizes that a high level (low level) indicates that the light emitting diode LED is open, and a low level (high level) indicates that the light emitting diode LED is working normally.

[0179] Or, for example, in the state of performing short-circuit detection, the second control circuit 23 can determine whether the light-emitting diode LED is short-circuited according to the high and low levels output by the voltage comparator 30 .

[0180] For example, the second control circuit 23 recognizes that a high level (low level) indicates that the light emitting diode LED is short-circuited, and a low level (high level) indicates that the light emitting diode LED is working normally.

[0181] Reference voltage V ref Greater than the set value, the detection result is used to indicate whether the circuit is open, the reference voltage V ref If the voltage is less than the set value, the detection result is used to indicate whether there is a short circuit. The judgment logic can be referred to the above description and will not be repeated here.

[0182] Figure 9 A schematic structural diagram of a display device provided in an embodiment of the present application.

[0183] The embodiment of the present application provides a display device, such as Figure 9 As shown, the display device 5000 includes a lamp-driver integrated chip 3000 and a column driver circuit 2000 , and the lamp-driver integrated chip 3000 is coupled to the column driver circuit 2000 .

[0184] For example, the display device 5000 includes multiple integrated lamp driver chips 3000, which are arranged in multiple rows and columns. The display device 5000 includes multiple column driver circuits 2000, and the integrated lamp driver chips 3000 located in the same column are coupled to the same column driver circuit 2000. Each column driver circuit 2000 can be coupled to one or more columns of integrated lamp driver chips 3000. Figure 9 The example in which two columns of integrated lamp drivers 3000 are coupled to the same column driver circuit 2000 is used for illustration.

[0185] Any of the above-mentioned integrated lamp-driver chips 3000 and any of the above-mentioned column driver circuits 2000 can be applied to the display device 5000 provided in the embodiments of the present application.

[0186] In some embodiments, the display device 5000 further includes a row driver circuit 6000, and the integrated lamp driver chips 3000 located in the same row are coupled to the same row driver circuit 6000. Each row driver circuit 6000 can be coupled to one or more rows of integrated lamp driver chips 3000. Figure 9 The example in which two rows of integrated lamp drivers 3000 are coupled to the same row of driver circuits 6000 is used for illustration.

[0187] Illustratively, the column driving circuit 2000 cooperates with the row driving circuit 6000 to input a row selection signal and a column selection signal to the display panel 4000 . After receiving the selection signal and the column selection signal, the display panel 4000 controls the display of the display panel 4000 .

[0188] In some embodiments, as shown in the figure, the display panel 4000 provided in the embodiment of the present application includes a plurality of integrated lamp-driver chips 3000, and the plurality of integrated lamp-driver chips 3000 are arranged in multiple rows and columns.

[0189] The integrated lamp driver chips 3000 in the same column of the display panel 4000 are coupled to the same column driver circuit 2000. For example, each column driver circuit 2000 can be coupled to one or more columns of the integrated lamp driver chips 3000. This embodiment of the present application is not limited to this.

[0190] The integrated lamp driver chips 3000 in the same row of the display panel 4000 are coupled to the same row driver circuit 6000. For example, each row driver circuit 6000 is coupled to one or more rows of integrated lamp driver chips 3000. This embodiment of the present application is not limited to this.

[0191] Figure 10 Schematic diagram of the coupling relationship between a lamp-driver integrated chip and row and column driver circuits provided in an embodiment of the present application.

[0192] For ease of illustration, Figure 10 The coupling relationship between a lamp driver integrated chip 3000 and the row driver circuit 6000 and the column driver circuit 2000 of the display panel 4000 is used as an example to illustrate the signal transmission between the row driver circuit 6000 and the column driver circuit 2000 and the lamp driver integrated chip 3000.

[0193] like Figure 10 As shown, the column driver circuit 2000 is coupled to the integrated lamp driver chip 3000. For example, the third pin 21 of the column driver circuit 2000 is coupled to the first pin 11 of the integrated lamp driver chip 3000, for transmitting a column selection signal to the integrated lamp driver chip 3000 and receiving a detection signal output by the integrated lamp driver chip 3000. The detection signal is used to indicate whether the light-emitting diode (LED) is operating normally. For example, the detection signal is used to detect the state of a switch circuit.

[0194] The integrated lamp-driver chip 3000 further includes a fifth pin 41 , which is coupled to the first control circuit 14 .

[0195] The row driving circuit 6000 includes a fourth pin 51 , and the fourth pin 51 is used to couple the row driving circuit 6000 to the integrated lamp driver chip 3000 .

[0196] The row driver circuit 6000 is coupled to the integrated lamp driver chip 3000. For example, the fourth pin 51 of the row driver circuit 6000 is coupled to the fifth pin 41 of the integrated lamp driver chip 3000 for transmitting a row selection signal (e.g., a clock signal CLK) to the integrated lamp driver chip 3000. For example, the fifth pin 41 is coupled to the first control circuit 14 of the integrated lamp driver chip 3000. The row selection signal output by the row driver circuit 6000 is transmitted to the first control circuit 14 via the fifth pin 41.

[0197] In the display device 5000, the column driver circuit 2000 is configured to output a first column selection signal. The pixel driver circuit 1000 in the integrated lamp-driver chip 3000 is configured to respond to the first column selection signal and output a detection signal. The column driver circuit 2000 is also configured to determine a detection result in response to the detection signal.

[0198] In some embodiments, the row driver circuit 6000 also sends a row selection signal to the integrated lamp driver chip 3000 in the display panel 4000. For example, the signal can be directly transmitted via the fourth pin 51 to the fifth pin 41 and received by the display panel 4000. In response to the first column selection signal and the row selection signal, the display panel 4000 selects the integrated lamp driver chip 3000.

[0199] For example, when performing open-circuit and short-circuit detection, the column driver circuit 2000 sends a first column selection signal to the integrated lamp-driver chip 3000 in the display panel 4000. The first column selection signal carries a detection command and a column selection command. For example, the detection command includes an open-circuit detection command, or the detection command includes a short-circuit detection command.

[0200] For example, when driving the light emission, the column driving circuit 2000 sends a second column selection signal to the integrated lamp-driver chip 3000 in the display panel 4000 , where the second column selection signal carries a column selection command.

[0201] The first column selection signal may be, for example, a digital signal, and the row selection signal may be, for example, a clock signal that can be used to parse the protocol. The present embodiment of the present application does not limit the order in which the first row selection signal and the column selection signal are sent. After receiving the row selection signal and the first column selection signal, the display panel 4000 selects the integrated lamp-driver chip 3000 to be tested.

[0202] For example, the integrated lamp driver chip 3000 to be detected can be selected based on the first column selection signal and the row selection signal. The first control circuit 14 in the selected integrated lamp driver chip 3000 responds to the detection signal carried in the first column selection signal to control the first switch circuit 131 and the second switch circuit 132 in a selection circuit 13 of the selected integrated lamp driver chip 3000 to turn on.

[0203] At this time, the signal at the second pin 12 is used to feed back the voltage of the power supply voltage terminal VLED after the voltage drop of the light emitting diode LED.

[0204] For example, before the display panel 4000 outputs the detection signal of the selected lamp driver integrated chip 3000, the first control circuit 14 is also used to control the first bidirectional input and output interface IO1 from receiving the column selection signal to outputting the detection signal, and the second control circuit 23 is also used to control the second bidirectional input and output interface IO2 from outputting the column selection signal to receiving the detection signal.

[0205] Subsequently, the detection signal (analog signal) at the second pin 12 passes through the first switch circuit 131 and the first bidirectional input / output interface IO1 and is output from the first pin 11 .

[0206] The column driving circuit 2000 responds to the detection signal and the reference voltage V ref , determine the test result. The judgment logic can refer to the above related description and will not be repeated here.

[0207] The display device 5000 provided in the embodiments of the present application utilizes improvements to the integrated light driver chip 3000 and the column driver circuit 2000, enabling the column driver circuit 2000 to send a first column selection signal carrying a detection command and a column selection command to the integrated light driver chip 3000. Simultaneously, the integrated light driver chip 3000 can respond to the column selection command and output a detection signal after testing the light-emitting diode (LED) under test in response to the detection command. The column driver circuit 2000 can determine the status of the light-emitting diode (LED) under test in response to the detection signal, thereby determining whether the LED is in a normal operating state, an open circuit state, or a short circuit state. This allows detection of the operating state of the light-emitting diode (LED) in the integrated light driver chip 3000 in AM mode. Furthermore, the coupling circuits between the pixel driver circuit 1000 and the light-emitting diode (LED), as well as the coupling circuits between the column driver circuit 2000 and the integrated light driver chip 3000, can reuse the existing coupling circuits of the display device 5000, eliminating the need for additional coupling circuit modifications, resulting in minimal process changes and high solution feasibility.

[0208] In some embodiments, when the integrated lamp-driver chip 3000 on the display panel 4000 is arranged in multiple rows and columns, the above detection method is repeated row by row on the display panel 4000 to perform open and short circuit detection.

[0209] For example, the row driver circuit 6000 can activate the clock signal row by row. When the clock signal for a row is activated, it outputs the clock signal to all the integrated driver chips 3000 in that row. Simultaneously, all column driver circuits 2000 output the first column selection signal. At this point, all integrated driver chips 3000 in the row with the activated clock signal receive the first column selection signal for the corresponding column. Subsequently, all integrated driver chips 3000 in that row control the first bidirectional input / output interface IO1 to enter the detection working state, implementing the open / short circuit detection function described above, following the same steps as above.

[0210] By providing a bidirectional input / output interface IO in the display device 5000, the display device 5000 can be used to transmit both display signals and detection signals. This allows for open-circuit and short-circuit detection of the light-emitting diode (LED) without adding complex logic, improving the maintainability of the integrated lamp-driver chip 3000.

[0211] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A display device, characterized in that: The display device includes a lamp-driver integrated chip and a column driving circuit, wherein the lamp-driver integrated chip is coupled to the column driving circuit; The integrated lamp-driver chip includes a pixel driving circuit and a plurality of light-emitting diodes, and the pixel driving circuit is coupled to the plurality of light-emitting diodes respectively; The column driving circuit is configured to output a first column selection signal; The pixel driving circuit is configured to respond to the first column selection signal and output a detection signal corresponding to the light emitting diode; the detection signal is used to represent the working state of the light emitting diode; The column driver circuit is further configured to determine a detection result in response to the detection signal.

2. The display device according to claim 1, wherein The first column selection signal is a digital signal, and the detection signal is an analog signal.

3. The display device according to claim 1, wherein The integrated lamp driver chip further includes a first bidirectional input / output interface, which is used to input the first column selection signal and output the detection signal.

4. The display device according to claim 3, wherein The pixel driving circuit further includes a plurality of gating circuits and a first control circuit; The plurality of strobe circuits are correspondingly coupled to the plurality of light-emitting diodes, and the plurality of strobe circuits are also respectively coupled to the first bidirectional input and output interfaces; The first control circuit is coupled to the first bidirectional input / output interface and the plurality of selection circuits respectively; the first control circuit is configured to output the detection signal to the first bidirectional input / output interface in response to the first column selection signal.

5. The display device according to claim 4, wherein: The first control circuit is further configured to control the first bidirectional input / output interface to change from receiving the first column selection signal to outputting the detection signal in response to the first column selection signal.

6. The display device according to claim 5, wherein: The first control circuit is further configured to control the first bidirectional input / output interface to receive a signal sent by the column driver circuit after a first set period of time after controlling the first bidirectional input / output interface to output the detection signal.

7. The display device according to claim 1, wherein The column driving circuit is further configured to output a second column selection signal; The pixel driving circuit is further configured to drive the light emitting diode to emit light in response to the second column selection signal.

8. The display device according to claim 4, wherein: The gating circuit includes a first switch circuit, a second switch circuit and a current source, and the first column selection signal carries a detection command and a column selection command; The first switch circuit is coupled to the light emitting diode and the first bidirectional input / output interface respectively, and the second switch circuit and the current source are coupled in series between the light emitting diode and the first voltage terminal; The first control circuit is also coupled to the first switch circuit and the second switch circuit respectively, and is configured to control the on and off of the first switch circuit according to the detection command, and to control the on and off of the second switch circuit according to the column selection command.

9. The display device according to claim 8, wherein The first switching circuit includes a transistor; A first electrode of the transistor is coupled to the light emitting diode, a second electrode of the transistor is coupled to the first bidirectional input / output interface, and a control electrode of the transistor is coupled to the first control circuit.

10. The display device according to any one of claims 1 to 9, characterized in that: The column driving circuit includes a second bidirectional input / output interface, and the second bidirectional input / output interface is used to output the first column selection signal and receive the detection signal.

11. The display device according to claim 10, wherein: The column driving circuit further includes a second control circuit; The second control circuit is coupled to the second bidirectional input / output interface and is configured to control the second bidirectional input / output interface to change from outputting the first column selection signal to receiving the detection signal after the second bidirectional input / output interface outputs the first column selection signal.

12. The display device according to claim 11, wherein The second control circuit is further configured to control the second bidirectional input / output interface to output the signal after a second set period of time has passed after controlling the second bidirectional input / output interface to receive the detection signal.

13. The display device according to claim 11, wherein The column driving circuit further includes a voltage comparator; a first input terminal of the voltage comparator is coupled to the second bidirectional input / output interface, a second input terminal of the voltage comparator is used to receive a reference voltage, and an output terminal of the voltage comparator is coupled to the second control circuit; The second control circuit determines the detection result in response to the signal output by the voltage comparator.

14. The display device according to claim 13, wherein: If the reference voltage is less than the set value, the detection result is used to indicate whether the circuit is open; if the reference voltage is greater than the set value, the detection result is used to indicate whether the circuit is short; or, If the reference voltage is greater than the set value, the detection result is used to indicate whether an open circuit exists; if the reference voltage is less than the set value, the detection result is used to indicate whether a short circuit exists.

15. A chip integrating lamp and driver, characterized in that: The integrated lamp-driver chip includes a pixel driving circuit and a plurality of light-emitting diodes, and the pixel driving circuit is coupled to the plurality of light-emitting diodes respectively; The pixel driving circuit includes a first bidirectional input-output interface, and the first bidirectional input-output interface is used to receive a first column selection signal. The pixel driving circuit is configured to respond to the first column selection signal and output a detection signal corresponding to the light emitting diode from the first bidirectional input and output interface; the detection signal is used to represent a fault state of the light emitting diode.

16. A column driving circuit, characterized in that: The column driving circuit includes a second bidirectional input and output interface, and the second bidirectional input and output interface is used to couple with a light-driven integrated chip including a light-emitting diode; The second bidirectional input / output interface is used to output a first column selection signal and is also used to receive a detection signal, wherein the detection signal is used to indicate whether the light emitting diode is operating normally; The column driver circuit is configured to determine a detection result in response to the detection signal.

17. A display panel, characterized in that: The display panel includes a plurality of integrated lamp-driver chips as described in claim 15 , and the plurality of integrated lamp-driver chips are arranged in multiple rows and columns.

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