Power module, display system and chip

Abstract

The application discloses a power module, a display system and a chip. The power module comprises a direct-current power supply configured to provide a direct-current voltage to a plurality of to-be-tested elements; a plurality of feedback modules configured to provide feedback signals according to channel voltages on the plurality of to-be-tested elements; and an adjusting module configured to adjust the size of the direct-current voltage according to the feedback signals, so that the direct-current voltage is controlled to be within a predetermined range. Each feedback module provides a detection signal according to the channel voltage on the corresponding to-be-tested element. A main circuit in the plurality of feedback modules collects the detection signals provided by each feedback module and provides the feedback signals according to the collection result. The power module can simultaneously detect the channel voltages of the plurality of to-be-tested elements and realize single-line feedback adjustment of the plurality of to-be-tested elements.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to a power module, a display system, and a chip. Background Technology

[0002] With the continuous development of the industry and the leapfrog breakthroughs in technology, light-emitting diodes (LEDs) have been widely used in various fields such as displays, television lighting decorations, and general lighting. LEDs have advantages such as low cost, low energy consumption, high stability, and ease of control, all of which demonstrate the broad prospects of LEDs in the display field.

[0003] In the field of LED display technology, display driver chips typically provide DC voltage to LED chips via an external DC-DC power supply. During LED operation, the DC voltage provided by the DC-DC power supply is not constant and requires adjustment to ensure stable operation of each LED chip. However, the adjustment methods for existing DC-DC power supplies remain overly complex. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide a power module, a display system and a chip, thereby realizing single-line feedback regulation of multiple components under test.

[0005] According to a first aspect of the present invention, a power supply module is provided, comprising: a DC power supply for providing a DC voltage to a plurality of devices under test (DUTs); a plurality of feedback modules for providing feedback signals based on channel voltages on the plurality of DUTs; and an adjustment module for adjusting the magnitude of the DC voltage based on the feedback signals to control the DC voltage within a predetermined range, wherein each of the feedback modules provides a detection signal based on a corresponding channel voltage on the DUT, and a main circuit in the plurality of feedback modules aggregates the detection signals provided by each of the feedback modules and provides the feedback signal based on the aggregated result.

[0006] Optionally, each of the feedback modules detects the boost result of the channel voltage in a first time period according to the synchronization signal to obtain a detection signal characterizing the boost result, and detects the buck result of the channel voltage in a second time period to obtain a detection signal characterizing the buck result.

[0007] Optionally, the main circuit aggregates the detection signals provided by each of the feedback modules to obtain a total detection signal, and provides the feedback signal based on the total detection signal. Specifically, during the first time period, if the total detection signal is set to 0, the main circuit provides a feedback signal in a first state, and the adjustment module controls the DC voltage to increase; if the total detection signal is set to 1, the main circuit provides a feedback signal in a second state, and the adjustment module controls the DC voltage to remain constant. During the second time period, if the total detection signal is set to 0, the main circuit provides a feedback signal in a second state, and the adjustment module controls the DC voltage to remain constant; if the total detection signal is set to 1, the main circuit provides a feedback signal in a third state, and the adjustment module controls the DC voltage to decrease.

[0008] Optionally, the feedback module sends the feedback signal to the adjustment module every adjustment cycle. Each adjustment cycle includes at least a first time period and a second time period. The adjustment module has the highest priority to control the DC voltage to increase and the lowest priority to control the DC voltage to remain unchanged.

[0009] Optionally, each of the feedback modules includes: a first terminal for receiving the DC voltage and providing the DC voltage to the device under test; a detection unit for detecting the channel voltage on the device under test; a logic unit connected to the detection unit for providing the detection signal based on the channel voltage on the device under test; and a second terminal, wherein the second terminals of each of the feedback modules are connected together to provide the detection signal to the main circuit, wherein the logic unit in the main circuit summarizes the detection signals provided by each of the feedback modules to obtain a total detection signal.

[0010] Optionally, the main circuit further includes: a timer that stores grayscale signals and selects one of the grayscale signals as the feedback signal according to the total detection signal; a buffer connected to the timer for temporarily storing the feedback signal; and an output terminal connected to the buffer for providing the feedback signal to the adjustment module.

[0011] Optionally, each feedback module further includes a pull-down resistor. The logic unit provides the detection signal by controlling the conduction state of the pull-down resistor. Specifically, during a first time period for detecting the boost result of the channel voltage, if the detection unit detects that the channel voltage value is lower than the lower limit voltage value, the logic unit turns on the pull-down resistor to set the detection signal to 0. If the detection unit detects that the channel voltage value is not lower than the lower limit voltage value, the logic unit turns off the pull-down resistor to set the detection signal to 1. During a second time period for detecting the buck result of the channel voltage, if the detection unit detects that the channel voltage value is higher than the upper limit voltage value, the logic unit turns off the pull-down resistor to set the detection signal to 1. If the detection unit detects that the channel voltage value is not higher than the upper limit voltage value, the logic unit turns on the pull-down resistor to set the detection signal to 0.

[0012] Optionally, the feedback module uses a total detection signal to represent the sum of the detection signals provided by multiple feedback modules. When any one of the pull-down resistors in the multiple feedback modules is turned on, the feedback signal provided by the main circuit is set to 0. Specifically, during the first time period, when any detection unit in any feedback module detects that the channel voltage value is lower than the lower limit voltage value, the total detection signal is set to 0, and the adjustment module controls the DC voltage to increase according to the feedback signal. During the second time period, when any detection unit in any feedback module detects that the channel voltage value is not higher than the upper limit voltage value, the total detection signal is set to 0, and the adjustment module controls the DC voltage to remain unchanged according to the feedback signal.

[0013] Optionally, the DC power supply includes an output terminal for providing the DC voltage and a feedback terminal related to regulating the DC voltage; the main circuit includes an output terminal for providing the feedback signal; the regulation module includes: a first voltage divider resistor, a second voltage divider resistor, and a third voltage divider resistor connected in series between the output terminal of the DC voltage and a reference ground; the feedback terminal of the DC power supply is connected to a series node between the second voltage divider resistor and the third voltage divider resistor; and a feedback resistor, the first end of which is connected to the output terminal of the main circuit, and the second end of which is connected to the series node between the first voltage divider resistor and the second voltage divider resistor.

[0014] According to a second aspect of the present invention, a display system is provided, comprising: a plurality of light-emitting elements; and a power supply module as described above, for providing a DC voltage within a predetermined range to the plurality of light-emitting elements.

[0015] Optionally, the display system is selected from any one of smartphones, laptops, tablets, desktop computers, in-vehicle computers, wearable devices, televisions, and electronic advertising screens.

[0016] According to a third aspect of the present invention, a chip is provided, the chip being used to adjust a DC voltage provided by a DC power supply and comprising: a plurality of feedback modules for providing feedback signals based on channel voltages on a plurality of devices under test; and an adjustment module for adjusting the magnitude of the DC voltage based on the feedback signals to control the DC voltage within a predetermined range, wherein each of the feedback modules provides a detection signal based on a corresponding channel voltage on the device under test, and a main circuit in the plurality of feedback modules summarizes the detection signals provided by each of the feedback modules and provides the feedback signal based on the summarization result.

[0017] The power module, display system, and chip provided by this invention collect the channel voltage of each component under test and provide corresponding detection signals. The detection signals are then aggregated to provide feedback signals. The DC power supply can adjust its DC voltage by receiving only the feedback signal provided by the main circuit, thus realizing single-line feedback regulation. Furthermore, by performing time-division processing on the boost and buck results of the channel voltage, bidirectional regulation of boost and buck can be achieved. Attached Figure Description

[0018] The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0019] Figure 1 A schematic diagram of a power supply module according to an embodiment of the present invention is shown;

[0020] Figure 2 This diagram illustrates the relationship between the DC voltage provided by the power module according to an embodiment of the present invention and the channel voltage on the device under test.

[0021] Figure 3 The waveforms of the total detection signal according to an embodiment of the present invention are shown in the first time period and the second time period;

[0022] Figure 4 A block diagram of a display system according to an embodiment of the present invention is shown. Detailed Implementation

[0023] The invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale. Furthermore, some well-known parts may not be shown in the drawings.

[0024] It should be understood that the connection / coupling of A and B in the embodiments of this application means that A and B can be connected in series or in parallel, or A and B can be connected through other devices. The embodiments of this application do not limit this.

[0025] The power module and chip provided in this application can be applied to display panels in various display systems, such as television equipment, computer equipment, handheld devices, smart home devices, automotive equipment, smart wearable devices, and advertising screen equipment. As examples, the display panel may be a light-emitting diode (LED) display panel, an organic light-emitting diode (OLED) display panel, a mini light-emitting diode (miniLED) display panel, or a micro organic light-emitting diode (micro OLED) display panel.

[0026] In traditional technology, the chip used to drive the display panel provides the input voltage to the light-emitting elements through an external DC-DC power supply as a constant current voltage source. To ensure the normal operation of the chip under the constant current voltage source, the chip monitors the channel voltage (VDS) of all light-emitting element channels and feeds it back to the DC-DC power supply to adjust the output voltage of the DC-DC power supply.

[0027] A traditional technique involves pre-setting a relatively high output voltage value for the DC-DC power supply, then collecting monitoring results from all chips, and adjusting the voltage appropriately to a range suitable for the normal operation of all chips based on these results. However, this method cannot provide feedback on boost voltage requirements and therefore cannot achieve bidirectional voltage adjustment.

[0028] The power supply module provided in this embodiment of the invention collects the channel voltage of each component under test and provides corresponding detection signals. It then summarizes the detection signals to provide feedback signals. The DC power supply can adjust the DC voltage it provides by only receiving the feedback signal provided by the main circuit, thus realizing single-line feedback regulation. Furthermore, by performing time-division processing on the boost and buck results of the channel voltage, it achieves bidirectional regulation of boost and buck.

[0029] Figure 1 A schematic diagram of a power module according to an embodiment of the present invention is shown. It should be understood that the power module in this application embodiment can be applied to various display systems, and this application embodiment does not limit it.

[0030] like Figure 1As shown, the power supply module 100 includes a DC power supply 110, a feedback module 120, and an adjustment module 130. The power supply module 100 can detect the channel voltage of each device under test 140 and adjust the DC voltage provided by the DC power supply 100 according to the channel voltage of each device under test 140.

[0031] DC power supply 110 is used to provide a DC voltage Vo to a plurality of devices under test 140. In this embodiment, DC power supply 100 is, for example, a DC-DC power supply. The initial voltage value of DC voltage Vo is programmable, and its default value is stored in non-volatile memory and can be automatically read upon power-up.

[0032] Multiple feedback modules 120 respectively detect the channel voltage on their corresponding device under test 140, and provide feedback signals V based on the channel voltages on the multiple devices under test 140. FBO Specifically, each feedback module 120 provides a detection signal V based on the channel voltage on the corresponding device under test 140. FDC and the detection signal V FDC The main circuit is provided to multiple feedback modules, and the main circuit provides feedback to each detection signal V. FDC The results are summarized, and a feedback signal V is provided based on the summary. FBO Optionally, the multiple feedback modules 120 may have the same circuit structure, and the main circuit may be any one of the multiple feedback modules 120.

[0033] The adjustment module 130 is connected to the output terminal of the main circuit and is used to adjust the signal V according to the feedback signal. FBO The magnitude of the DC voltage Vo is adjusted to control it within a predetermined range. As an example, the feedback signal V... FBO It is a multi-bit voltage feedback signal; its bit width determines the accuracy of the feedback, and its value determines the level of the feedback voltage. Optionally, the feedback signal V... FBO The value is based on the detection signal V FDC The sum of the results gradually increases or decreases, thereby gradually adjusting the DC voltage Vo output by the DC power supply 110.

[0034] In this embodiment, the device under test 140 detected by each feedback module 120 is, for example, a light-emitting diode (LED), and each feedback module 120 can detect the channel voltage of four LEDs. It should be understood that the device under test 140 can also be other types of components, and the number of components that each feedback module 120 can detect is adjustable according to actual conditions. For example, each feedback module 120 can also detect the channel voltage of one row or one column, multiple rows or multiple columns, or half a row or half a column of LEDs. This application does not limit the type and number of devices under test 140.

[0035] To achieve bidirectional regulation of the DC power supply 110 for both boost and buck, the feedback module 120 detects the boost result of the channel voltage within a first time period based on the synchronization signal, in order to obtain a detection signal V characterizing the boost result. FDC And will be combined with the detection signal V FDC The corresponding feedback signal V FBO The voltage drop result of the channel voltage is provided to the regulation module 130 during the second time period to obtain a detection signal V that characterizes the voltage drop result. FDC And will be combined with the detection signal V FDC The corresponding feedback signal V FBO Provided to the adjustment module 130. In this embodiment, the boost result refers to whether the DC voltage Vo needs to be boosted, and the buck result refers to whether the DC voltage Vo needs to be bucked.

[0036] As an example, the main circuit in feedback module 120 converts the detection signals V provided by each feedback module into signals V. FDC The signals are then aggregated to obtain the total detection signal. If the total detection signal is set to 0 during the first time period, indicating that boost processing is required, the feedback module 120 provides a feedback signal V corresponding to the boost processing. FBO (That is, the feedback signal V in the first state) FBO The adjustment module 130 controls the DC voltage Vo to increase. If the total detection signal is set to 1, indicating that no boost processing is required, the feedback module 120 provides a feedback signal V corresponding to the absence of boost processing. FBO (That is, the feedback signal V of the second state) FBO The regulating module 130 controls the DC voltage Vo to remain constant; during the second time period, if the total detection signal V... FBO Setting it to 0 indicates that no buck processing is required; in this case, the feedback module 120 provides a feedback signal V corresponding to the absence of buck processing. FBO (That is, the feedback signal V of the second state) FBO The regulating module 130 controls the DC voltage Vo to remain constant. If the total detection signal is set to 1, indicating that a voltage reduction process is required, the feedback module 120 provides a feedback signal V corresponding to the voltage reduction process. FBO (That is, the feedback signal V of the third state) FBO The regulating module 130 controls the DC voltage Vo to decrease.

[0037] In other examples, feedback module 120 sends a feedback signal V to regulation module 130 every regulation cycle. FBOEach adjustment cycle includes at least a first time period and a second time period. The adjustment module 130 has the highest priority in increasing the DC voltage Vo, and the lowest priority in keeping the DC voltage Vo constant. For example, if a voltage boost is detected during the first time period, the adjustment module 130 will increase the DC voltage Vo regardless of the detection result during the second time period. If a voltage boost is not detected during the first time period, and a voltage debuff is not detected during the second time period, the adjustment module 130 will keep the DC voltage Vo constant. If a voltage boost is not detected during the first time period, and a voltage debuff is detected during the second time period, the adjustment module 130 will increase the DC voltage Vo.

[0038] In some specific embodiments, each feedback module 120 includes: a detection unit 121 for detecting the channel voltage on the device under test 140; and a logic unit 122 connected to the detection unit 121 for providing a detection signal V based on the channel voltage on the device under test 140. FDC The logic unit 122 of the main circuit is also used to process each detection signal V FDC The signals are summarized to obtain the total detection signal; optionally, the feedback module 120 also includes a timer 123 that stores grayscale signals and selects one of the grayscale signals as the feedback signal V based on the total detection signal. FBO ; and buffer 124, connected to timer 123, for temporarily storing feedback signal V. FBO In this embodiment, timer 123 and buffer 123 are both 9 bits, for example. In other embodiments, in order to improve the accuracy of feedback adjustment or to take into account the performance of the circuit, the number of bits of timer 123 and buffer 123 can be increased or decreased. This application does not limit the specific number of bits and bit width.

[0039] Each feedback module 120 has the following input / output terminals: a first terminal VLED, which receives DC voltage Vo and provides DC voltage Vo to the device under test 140; an anode terminal SWX and a channel terminal CHX, connected to the two ends of the device under test 140 to facilitate the detection unit 121 to detect the channel voltage on the device under test 140; and a second terminal FDC, which is connected to the second terminals of all feedback modules 120 to transmit the detection signal VLED. FDC The signal is provided to the main circuit, whereby the main circuit receives the detection signal V from each feedback module 120. FDC In summary, the main circuit also includes a feedback signal V. FBO The output terminal FBO. Optionally, each feedback module 120 includes a terminal for providing the feedback signal V. FBOThe output terminal FBO is used, which is beneficial for the mass production of feedback module 120. However, in the actual circuit connection, the output terminals FBO of other feedback modules 120 besides the main circuit are idle.

[0040] In order to provide the detection signal V FDC Each feedback module 120 also includes a pull-down resistor and a memory (not shown). The logic unit 122 provides the detection signal V by controlling the conduction state of the pull-down resistor. FDC The memory is used to store the preset upper and lower voltage values ​​of the channel voltage. The memory can be any type of non-volatile memory and can be automatically read when powered on. This application does not impose any restrictions on this.

[0041] Specifically, during the first time period for detecting the boost result of the channel voltage, if the detection unit 121 detects that the channel voltage value is lower than the lower limit voltage value, the logic unit 122 turns on the pull-down resistor to boost the detection signal V. FDC If the detection unit 121 detects that the channel voltage value is not lower than the lower limit voltage value, the logic unit 122 turns off the pull-down resistor to set the detection signal V to 0. FDC If, during the second time period used to detect the voltage drop result of the channel voltage, the detection unit 121 detects that the channel voltage value is higher than the upper limit voltage value, then the logic unit 122 turns off the pull-down resistor to reduce the detection signal V. FDC If the detection unit 121 detects that the channel voltage value is not higher than the upper limit voltage value, then the logic unit 122 turns on the pull-down resistor to reduce the detection signal V. FDC Set to 0.

[0042] Optionally, the total detection signal represents the detection signals V provided by multiple feedback modules 120. FDC The summary results show that when any one of the pull-down resistors in the multiple feedback modules 120 is turned on, the total detection signal provided by the main circuit is set to 0. Specifically, during the first time period, when the detection unit 121 in any one of the feedback modules 120 detects that the channel voltage value is lower than the lower limit voltage value, the total detection signal is set to 0, and the adjustment module 130 adjusts according to the feedback signal V. FBO The DC voltage Vo is increased. During the second time period, when the detection unit 121 in any feedback module 120 detects that the channel voltage value is not higher than the upper limit voltage value, the total detection signal V... FBO Set to 0, and adjust module 130 according to feedback signal V FBO The DC voltage Vo is kept constant.

[0043] As an example, the DC power supply 110 includes an output terminal for providing a DC voltage Vo, a feedback terminal related to regulating the DC voltage Vo, and a main circuit for providing a feedback signal V.FBO The output terminal FBO of the DC power supply 110 is connected in series with a first voltage divider resistor R1, a second voltage divider resistor R2, and a third voltage divider resistor R3 between the output terminal of the DC voltage Vo and the reference ground. The feedback terminal of the DC power supply 110 is connected to the series node between the second voltage divider resistor R2 and the third voltage divider resistor R3. The feedback resistor RFB has a first end connected to the output terminal FBO of the main circuit and a second end connected to the series node between the first voltage divider resistor R1 and the second voltage divider resistor R2.

[0044] In this example, based on the current shunting principle of the circuit, we can obtain formula (1):

[0045]

[0046] Among them, V o The voltage value is the DC voltage, V. x V is the voltage value at the series node between the first voltage divider resistor R1 and the second voltage divider resistor R2. fb The voltage value at the output terminal FBO of the main circuit, R1 is the resistance value of the first voltage divider resistor R1, R fb R1 is the resistance value of the feedback resistor RFB, R2 is the resistance value of the second voltage divider resistor R2, and R3 is the resistance value of the third voltage divider resistor R3.

[0047] Based on the voltage divider principle of the circuit, we can obtain formula (2):

[0048]

[0049] Among them, V f This is the voltage value at the series node between the second voltage divider resistor R2 and the third voltage divider resistor R3.

[0050]

[0051] Combining formulas (1) and (2), we can obtain formula (3):

[0052] As can be seen from formula (3), the DC voltage Vo can be adjusted by the voltage value of the output terminal FBO of the main circuit, that is, the DC voltage can be adjusted by the level of the feedback signal.

[0053] The power supply module of this invention uses multiple feedback modules to collect the channel voltage of each component under test and provides corresponding detection signals. The detection signals are then summarized into a feedback signal, which can characterize the detection results of all feedback modules. Therefore, the DC power supply can adjust the DC voltage it provides by only receiving the feedback signal, thus realizing single-line feedback regulation. Furthermore, by performing time-division processing on the boost and buck results of the channel voltage, bidirectional regulation of boost and buck can be achieved.

[0054] This invention also provides a chip for adjusting the DC voltage Vo provided by a DC power supply 110 and includes: a plurality of feedback modules 120 for providing feedback signals V based on the channel voltages on a plurality of devices under test 140. FBO ; and adjustment module 130, based on feedback signal V FBO The magnitude of the DC voltage Vo is adjusted to control it within a predetermined range, wherein each feedback module 120 provides a detection signal V based on the channel voltage on the corresponding device under test 140. FDC and the detection signal V FDC The main circuit is provided to multiple feedback modules 120, and the main circuit provides feedback based on each detection signal V. FDC Provide feedback signal V FBO .

[0055] The foregoing has described some examples of power modules according to embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and there may be other extensions and modifications.

[0056] For example, it should be understood that the reference ground potential in the foregoing embodiments may be replaced in alternative embodiments with other non-zero reference potentials (with positive or negative voltage amplitudes) or a controlled-change reference signal.

[0057] Furthermore, those skilled in the art will recognize that the structures and methods described in conjunction with the embodiments disclosed herein can be used with different configuration or adjustment methods to achieve the described functions for each structure or reasonable variations thereof, but such implementations should not be considered beyond the scope of this application. Moreover, it should be understood that the connection relationships between the various components of the amplifier in the foregoing figures in the embodiments of this application are illustrative examples and do not impose any limitations on the embodiments of this application.

[0058] Based on an exemplary configuration method, Figure 2 A schematic diagram illustrating the relationship between the DC voltage provided by the power module according to an embodiment of the present invention and the channel voltage on the device under test is shown. Wherein, V DSVLED represents the channel voltage on the device under test, and VLED represents the DC voltage provided by the power supply module. For clarity, two waveforms, GO_DOWN and DO_UP, are used to represent different states of the feedback signal. A high level of GO_UP represents the feedback signal corresponding to boost processing (first state feedback signal), a low level of GO_UP represents the feedback signal corresponding to no boost processing (second state feedback signal), a high level of GO_DOWN represents the feedback signal corresponding to buck processing (third state feedback signal), and a low level of GO_DOWN represents the feedback signal corresponding to no buck processing (second state feedback signal).

[0059] like Figure 2 As shown, during the time interval t1, the channel voltage V on the device under test is... DS Less than the upper limit voltage V REF_H And greater than the lower limit voltage V REF_L Within the predetermined range, the feedback signal is in the second state, and the adjustment module controls the DC voltage supplied by the DC power supply to remain constant; during the time period t2, the channel voltage V on the device under test... DS Greater than the upper limit voltage V REF_H When the signal is outside the predetermined range, the feedback signal is in the first state, and the adjustment module controls the DC voltage supplied by the DC power supply to gradually decrease until the channel voltage V... DS Less than the upper limit voltage V REF_H During the time interval t3, the channel voltage V on the device under test DS Less than the upper limit voltage V REF_H And greater than the lower limit voltage V REF_L Within the predetermined range, the feedback signal is in the second state, and the adjustment module controls the DC voltage supplied by the DC power supply to remain constant; during the time period t4, the channel voltage V on the device under test... DS Below the lower limit voltage V REF_L If the signal is outside the predetermined range, the feedback signal is in the third state. The adjustment module controls the DC voltage supplied by the DC power supply to increase until the channel voltage V... DS Above the lower limit voltage V REF_L .

[0060] As can be seen from the above embodiments, the power module of the present invention realizes single-line feedback bidirectional regulation, providing a simple and efficient feedback regulation method.

[0061] Figure 3 The waveforms of the total detection signal according to an embodiment of the present invention are shown in the first time period and the second time period.

[0062] like Figure 3As shown, waveforms FDC1-4 illustrate four different scenarios of the total detection signal provided by the feedback module in the first and second time periods. According to... Figure 1 As shown in the configuration of the feedback module, during the first time period, a total detection signal of 1 indicates that the DC voltage needs to be maintained, while a total detection signal of 0 indicates that the DC voltage needs to be boosted. During the second time period, a total detection signal of 1 indicates that the DC voltage needs to be debuffed, while a total detection signal of 0 indicates that the DC voltage needs to be maintained. Controlling the increase of the DC voltage has the highest priority, while controlling the DC voltage to remain unchanged has the lowest priority.

[0063] Specifically, in this embodiment, each adjustment cycle of the feedback module includes a first time period T1 and a second time period T2. When the synchronization signal VSYNC triggers the feedback module to detect the channel voltage of the device under test, in the first case, as shown by waveform FDC1, the total detection signal is low in both the first time period T2 and the second time period T3, so the DC voltage is increased; in the second case, as shown by waveform FDC2, the total detection signal is high in both the first time period T1 and the second time period T2, so the DC voltage is decreased; in the third case, as shown by waveform FDC3, the total detection signal is low in the first time period T1 and high in the second time period T2, so the DC voltage is increased; in the fourth case, as shown by waveform FDC4, the total detection signal is high in the first time period T1 and low in the second time period T2, so the DC voltage remains unchanged.

[0064] As can be seen, the power module of this embodiment of the invention realizes single-line feedback regulation based on time-division detection, and the stability of the power module output signal can be enhanced by designing the regulation period.

[0065] This invention also provides a display system, including: a plurality of light-emitting elements; and as shown in the embodiments of the present invention. Figure 1 The power module 100 shown is used to provide a DC voltage within a predetermined range to multiple light-emitting elements. Optionally, the display system can be selected from any one of smartphones, laptops, tablets, desktop computers, in-vehicle computers, wearable devices, televisions, electronic advertising screens, smart home devices, etc. This application does not limit the specific use of the display system.

[0066] Based on an exemplary configuration, Figure 4 A block diagram of a display system according to an embodiment of the present invention is shown. It should be understood that... Figure 4 The display system shown is merely an example, and this application does not limit the specific form of the display system.

[0067] like Figure 4As shown, the display device 200 includes a display array 210, a row driving circuit 220, a column driving circuit 230, a control circuit 240, multiple row lines and multiple column lines, a memory 250, and a power module 260.

[0068] For example, the display array 210 includes a plurality of LEDs arranged in a 7*16 array, with the anodes of the LEDs in the same row connected to the same row line, the cathodes of the LEDs in the same column connected to the same column line, and the column line to which the LEDs in the same column are connected having a parasitic capacitance Cp to ground.

[0069] The display array 210 is selected, for example, from an LED (Light Emitting Diode) display array, an AMOLED (Active-Matrix Organic Light Emitting Diode) display array, a MicroLED display array, or a MiniLED display array.

[0070] Row drive circuit 220 is connected to multiple row lines, for example, seven row lines from row line 1 to row line 7, to provide row scan signals to turn on the LEDs of the corresponding row. Column drive circuit 230 is connected to multiple column lines, for example, column lines out1 to out16, to provide drive signals corresponding to grayscale data. Control circuit 240 is connected to the row drive circuit and generates scan control signals to cause the row drive circuit 220 to scan the corresponding row lines. Control circuit 240 reads the data of the corresponding row from memory 250 according to the received third count value and transmits the data to column drive circuit 230, causing column drive circuit 230 to generate PWM pulse signals corresponding to the data, thereby causing display array 210 to display images. Memory 250 can also be integrated inside control circuit 240.

[0071] In this embodiment of the invention, the internal structure of the power module 260 can be found in [reference needed]. Figure 1 The power module 100 shown will not be described in detail here. In this embodiment, the power module 260 includes a DC power supply 261 and a chip 262. The DC power supply 261 provides DC voltage to the display array 210. The chip 262 is connected to multiple LEDs within the display array 210 and is used to detect the channel voltage of the LEDs and adjust the DC voltage provided by the DC power supply 261 according to the channel voltage of the LEDs, so that the voltage applied to the LEDs is within the normal operating voltage range. Optionally, the chip 262 includes multiple feedback modules, each of which can detect the channel voltage of a row or column of LEDs.

[0072] In some alternative embodiments, chip 262 can be integrated with row driving circuit 220, column driving circuit 230, and control circuit 240 in the same chip to form a display driver chip. It should be understood that this application does not limit the specific implementation of the various circuits in the display system, such as row driving circuit 220, column driving circuit 230, control circuit 240, multiple row lines and multiple column lines, memory 250, and power module 260.

[0073] The terms “module” and “circuit” as used in this invention may refer to, be part of, or include the following: Application Specific Integrated Circuit (ASIC), electronic circuit, processor (shared, dedicated, or grouped) and / or memory (shared, dedicated, or grouped) executing one or more software or firmware programs, combinational logic circuit, and / or other suitable components that provide the described functionality.

[0074] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0075] As described above, these embodiments of the present invention do not exhaustively cover all details, nor do they limit the invention to the specific embodiments described. Clearly, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to effectively utilize the invention and its modifications. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A power module, characterized in that, include: A DC power supply is used to provide DC voltage to multiple devices under test. Multiple feedback modules are used to provide feedback signals based on the channel voltages on the multiple components under test; as well as The adjustment module adjusts the magnitude of the DC voltage based on the feedback signal to control the DC voltage within a predetermined range. Each feedback module provides a detection signal based on the channel voltage on the corresponding component under test. The main circuit in the plurality of feedback modules aggregates the detection signals provided by each feedback module and provides the feedback signal based on the aggregated result. Each of the aforementioned feedback modules detects the boost result of the channel voltage within a first time period based on the synchronization signal to obtain a detection signal characterizing the boost result, and detects the buck result of the channel voltage within a second time period to obtain a detection signal characterizing the buck result. The main circuit aggregates the detection signals provided by each of the feedback modules to obtain a total detection signal, and provides the feedback signal based on the total detection signal. Specifically, during the first time period, if the total detection signal is set to 0, the main circuit provides a feedback signal for a first state, and the adjustment module controls the DC voltage to increase; if the total detection signal is set to 1, the main circuit provides a feedback signal for a second state, and the adjustment module controls the DC voltage to remain constant. During the second time period, if the total detection signal is set to 0, the main circuit provides a feedback signal for the second state, and the adjustment module controls the DC voltage to remain unchanged. If the total detection signal is set to 1, the main circuit provides a feedback signal for the third state, and the adjustment module controls the DC voltage to decrease.

2. The power module according to claim 1, characterized in that, The feedback module sends the feedback signal to the adjustment module every adjustment cycle. Each adjustment cycle includes at least a first time period and a second time period. The adjustment module has the highest priority to control the DC voltage to increase and the lowest priority to control the DC voltage to remain unchanged.

3. The power module according to claim 1 or 2, characterized in that, Each of the feedback modules includes: The first terminal receives the DC voltage and provides the DC voltage to the device under test; The detection unit is used to detect the channel voltage on the component under test; A logic unit, connected to the detection unit, is used to provide the detection signal based on the channel voltage on the device under test; and The second terminal, which is connected to the second terminal of each of the feedback modules, is used to provide the detection signal to the main circuit. The logic unit in the main circuit summarizes the detection signals provided by each feedback module to obtain a total detection signal.

4. The power module according to claim 3, characterized in that, The main circuit also includes: A timer stores grayscale signals and selects one of the grayscale signals as the feedback signal based on the total detection signal; A buffer, connected to the timer, is used to temporarily store the feedback signal; and The output terminal is connected to the buffer and is used to provide the feedback signal to the adjustment module.

5. The power module according to claim 3, characterized in that, Each of the feedback modules also includes a pull-down resistor, and the logic unit provides the detection signal by controlling the conduction state of the pull-down resistor. Specifically, during the first time period for detecting the boost result of the channel voltage, if the detection unit detects that the channel voltage value is lower than the lower limit voltage value, the logic unit turns on the pull-down resistor to set the detection signal to 0; if the detection unit detects that the channel voltage value is not lower than the lower limit voltage value, the logic unit turns off the pull-down resistor to set the detection signal to 1. During the second time period used to detect the voltage drop result of the channel voltage, if the detection unit detects that the voltage value of the channel voltage is higher than the upper limit voltage value, the logic unit turns off the pull-down resistor to set the detection signal to 1; if the detection unit detects that the voltage value of the channel voltage is not higher than the upper limit voltage value, the logic unit turns on the pull-down resistor to set the detection signal to 0.

6. The power module according to claim 5, characterized in that, The feedback module uses the total detection signal to represent the sum of the detection signals provided by the multiple feedback modules. When any one of the pull-down resistors in the multiple feedback modules is turned on, the feedback signal provided by the main circuit is set to 0. During the first time period, when any detection unit in the feedback module detects that the channel voltage value is lower than the lower limit voltage value, the total detection signal is set to 0, and the adjustment module controls the DC voltage to increase according to the feedback signal. During the second time period, when any of the detection units in the feedback module detects that the voltage value of the channel voltage is not higher than the upper limit voltage value, the total detection signal is set to 0, and the adjustment module controls the DC voltage to remain unchanged according to the feedback signal.

7. The power module according to claim 1, characterized in that, The DC power supply includes an output terminal for providing the DC voltage and a feedback terminal related to adjusting the DC voltage; the main circuit includes an output terminal for providing the feedback signal; and the adjustment module includes: A first voltage divider resistor, a second voltage divider resistor, and a third voltage divider resistor are connected in series between the output terminal of the DC voltage and the reference ground; the feedback terminal of the DC power supply is connected to the series node between the second voltage divider resistor and the third voltage divider resistor; and The feedback resistor has its first end connected to the output terminal of the main circuit and its second end connected to the series node between the first voltage divider resistor and the second voltage divider resistor.

8. A display system, characterized in that, include: Multiple light-emitting elements; as well as The power module as described in any one of claims 1 to 7 is used to provide a DC voltage within a predetermined range to the plurality of light-emitting elements.

9. The display system according to claim 8, characterized in that, The display system is selected from any one of the following: smartphone, laptop, tablet, desktop computer, in-vehicle computer, wearable device, television, electronic advertising screen, and smart home device.

10. A chip, characterized in that, The chip is used to regulate the DC voltage provided by the DC power supply and includes: Multiple feedback modules are used to provide feedback signals based on the channel voltages on multiple devices under test; and The adjustment module adjusts the magnitude of the DC voltage based on the feedback signal to control the DC voltage within a predetermined range. Each feedback module provides a detection signal based on the channel voltage on the corresponding component under test. The main circuit in the plurality of feedback modules aggregates the detection signals provided by each feedback module and provides the feedback signal based on the aggregated result. Each feedback module detects the boost result of the channel voltage within a first time period based on a synchronization signal to obtain a detection signal characterizing the boost result, and detects the buck result of the channel voltage within a second time period to obtain a detection signal characterizing the buck result. The main circuit aggregates the detection signals provided by each feedback module to obtain a total detection signal, and provides the feedback signal based on the total detection signal. Specifically, during the first time period, if the total detection signal is set to 0, the main circuit provides a feedback signal for a first state, and the adjustment module controls the DC voltage to increase; if the total detection signal is set to 1, the main circuit provides a feedback signal for a second state, and the adjustment module controls the DC voltage to remain constant. During the second time period, if the total detection signal is set to 0, the main circuit provides a feedback signal for the second state, and the adjustment module controls the DC voltage to remain unchanged. If the total detection signal is set to 1, the main circuit provides a feedback signal for the third state, and the adjustment module controls the DC voltage to decrease.

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