Display device

Abstract

According to the display device, the liquid crystal display panel is provided with the multiple reflectors, after the control circuit transmits the display driving data to the liquid crystal display panel, the liquid crystal display panel can adjust the reflectivity of the reflectors based on the display driving data, and the reflectivity of the reflectors can be adjusted under the condition that backlight provides the same light intensity. The light intensity reflected by the reflectors with different reflectivity is different, the backlight plate can determine the display driving data based on different reflection intensities so as to provide corresponding backlight, the control circuit does not need to process the backlight display data in the control process, the computing power required by the control circuit is reduced, the computing power cost of the control circuit can be reduced, and the control efficiency is improved. According to the processing process, the data transmission process from the control circuit to the backlight plate is replaced by the optical signal transmission process, the data transmission speed is increased, the time delay between the backlight plate and the liquid crystal display panel is shortened, and the image display quality of the liquid crystal display device is improved.

Description

Technical Field

[0001] Embodiments of this application relate to the field of display technology, and more particularly to a display device. Background Technology

[0002] A liquid crystal display device includes a liquid crystal panel, a backlight panel, and a controller. When the liquid crystal display device displays an image, the controller adjusts the liquid crystal molecules in the liquid crystal panel to achieve the corresponding deflection angle based on the display data. It also controls the backlight panel to generate backlight, which is projected onto the liquid crystal panel to output the corresponding display image.

[0003] Due to the application of micro LEDs in liquid crystal display devices, the number of micro LEDs on the backlight board increases, and the workload of the controller in processing and transmitting the data to be displayed by each micro LED also increases. This results in a delay between the time when the backlight board outputs backlight and the time when the liquid crystal display panel displays the image. When the liquid crystal display device displays fast-moving images, there is a problem that the backlight cannot follow the displayed image, which may lead to a decrease in brightness and ghosting. Summary of the Invention

[0004] This application provides a display device to solve the above-mentioned technical problems.

[0005] This application provides a display device, including: a power supply circuit, a control circuit, a liquid crystal display panel, and a backlight panel;

[0006] The control circuit is configured to output display drive data;

[0007] The liquid crystal display panel and the control circuit are electrically connected. The liquid crystal display panel is provided with an array of liquid crystal molecules, which are configured to adjust the deflection angle of the corresponding liquid crystal molecules based on the display driving data.

[0008] The control circuit is also configured to output a control signal;

[0009] The backlight panel includes multiple light-emitting units, each of which includes a light-emitting driving circuit and at least one light-emitting element;

[0010] The light-emitting driving circuit is configured to output a reference current signal based on the control signal during the light control phase.

[0011] The light-emitting element is configured to emit reference light based on the reference current signal;

[0012] The liquid crystal display panel is also provided with multiple reflectors, which correspond to the arrayed liquid crystal molecules and the multiple light-emitting driving circuits. The liquid crystal panel is also configured to adjust the reflectivity of the reflectors based on the display driving data.

[0013] Based on the reflectivity, the reference light emitted by the corresponding light-emitting element is reflected;

[0014] The light-emitting driving circuit is configured to receive reflected light and, during the light-emitting phase, output a driving current signal based on the light intensity of the reflected light and the control signal; the driving current signal corresponds to the display driving data.

[0015] The light-emitting element is also configured to emit backlight based on the driving current signal;

[0016] The display cycle of the light-emitting unit includes the light control stage and the light-emitting stage in sequence.

[0017] In the display device provided in this application embodiment, a plurality of reflectors are provided on the liquid crystal display panel. When the display device displays an image, the control circuit outputs display driving data to the liquid crystal display panel, so that the liquid crystal molecules in the liquid crystal display panel deflect at corresponding angles based on the display driving data, and adjusts the reflectivity of the reflectors based on the display driving data. The controller also outputs control signals to the backlight panel, so that the backlight panel generates reference light based on the control signals during the light control stage. The reflectors provide reflected light of different intensities to the backlight panel based on different reflectivities, so that the light-emitting driving circuit on the backlight panel drives the corresponding light-emitting element to generate the corresponding backlight based on the light intensity of the reflected light. Since the backlight generation control process of the backlight panel is based on the reflection of the liquid crystal display panel, the control circuit does not need to process the backlight display data, which reduces the computing power required by the control circuit and reduces the computing power cost of the control circuit. The above processing process also replaces the data transmission process from the control circuit to the backlight panel with the light signal transmission process, which speeds up the data transmission speed, shortens the delay between the backlight panel and the liquid crystal display panel, and improves the image display quality of the liquid crystal display device. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] Figure 1 This is a schematic diagram of the structure of a conventional display device provided in accordance with an exemplary embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the structure of a conventional display device provided in another exemplary embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the structure of a display device provided in accordance with an exemplary embodiment of this application;

[0022] Figure 4This is a schematic diagram of the structure of a display device provided in this application according to another exemplary embodiment;

[0023] Figure 5A This is a schematic diagram of the structure of a light-emitting unit provided in an exemplary embodiment of this application;

[0024] Figure 5B This is a schematic diagram of the structure of a light-emitting unit provided in this application according to another exemplary embodiment;

[0025] Figure 6 This is a schematic diagram of the circuit structure of a light-emitting driving circuit provided in accordance with an exemplary embodiment of this application;

[0026] Figure 7 This is a timing diagram of the driving signals of a light-emitting driving circuit provided in an exemplary embodiment of this application;

[0027] Figure 8A This is a diagram showing the operating state of a light-emitting driving circuit provided in this application according to an exemplary embodiment;

[0028] Figure 8B This is a diagram illustrating the operating state of a light-emitting driving circuit provided in this application according to another exemplary embodiment.

[0029] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0030] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0031] It should be noted that, in this document, 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 limitations, 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 that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment. It should be further understood that the terms "comprising" or "including" indicate the presence of features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups.

[0032] In the description of this disclosure, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "Multiple" means two or more, unless otherwise explicitly specified. The terms "or" and "and / or" are interpreted as inclusive, or mean any one or any combination thereof. Therefore, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C." Exceptions to this definition occur only when combinations of elements, functions, steps, or operations are inherently mutually exclusive in some manner.

[0033] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0034] The display device provided in this application can have various implementation forms, such as a smart TV, a laser projection device, a monitor, an electronic bulletin board, an electronic table, etc. Figure 1 and Figure 2 This is one specific implementation of a display device.

[0035] Figure 1 This is a schematic diagram of the structure of a conventional display device according to some embodiments.

[0036] In some embodiments, the display device includes a control circuit configured to receive a video input signal or an image input signal, acquire backlight data and display data from the video input signal or the image input signal, and perform format conversion, timing control, and other processing on the backlight data and display data before outputting them.

[0037] In some embodiments, the control circuit may include a master controller 80, such as a system on chip (SOC), configured to obtain video input signals or image input signals (hereinafter referred to as input signals) from an external input port or a network port, and perform operations such as format conversion, data processing, and determination of backlight data and display data on the input signals.

[0038] In some embodiments, the control circuit includes an image processing chip 40, configured to perform operations such as image enhancement and image rendering on backlight data and display data.

[0039] In some embodiments, the control circuit may include a timing controller (Tcon) 50, configured to perform timing control on the acquired display data and output display drive data.

[0040] In some embodiments, the timing controller 50 is also configured to perform data format conversion.

[0041] In some embodiments, the control circuit may include a microcontroller unit (MCU) 60 configured to perform regional backlight data processing on the data generated by the image processing chip 40, including peak data processing, etc.

[0042] In some embodiments, the control circuit may include a backlight controller (Bcon) 70 or a dimming controller (DCON) configured to obtain processed data associated with backlight data, generate and output backlight drive data from the processed data.

[0043] In some embodiments, the display device includes a liquid crystal display panel 10, which is electrically connected to a Tcon 50. The liquid crystal display panel 10, from top to bottom, includes an upper substrate 101, a light-shielding structure 102, liquid crystal molecules 103, a pixel electrode plate 104, and a lower substrate 105. This structure is as follows: Figure 2 As shown.

[0044] The order from top to bottom is from the direction away from the backlight panel 20 to the direction closer to the backlight panel 20.

[0045] In some embodiments, the light-shielding structure 102 is a light-shielding film, and the area between the light-shielding film and the backlight panel 20 is a light-shielding area. The light-shielding structure is configured to prevent the display of devices and / or liquid crystal generated images in the light-shielding area when the backlight panel provides backlight.

[0046] In some embodiments, liquid crystal molecules are configured to deflect based on received processed display driving data.

[0047] In some embodiments, the liquid crystal display panel is further provided with a TFT device, the output terminal of which is electrically connected to the pixel electrode plate 104 and is configured to transmit an electrical signal corresponding to the display driving data to the pixel electrode plate 104 so that the liquid crystal molecules deflect at a corresponding angle based on the electrical signal.

[0048] In some embodiments, the default state of liquid crystal molecules is normally closed, and the deflection angle of the liquid crystal molecules is proportional to the grayscale value corresponding to the display driving data.

[0049] In other embodiments, the default state of the liquid crystal molecules is normally open, and the deflection angle of the liquid crystal molecules is inversely proportional to the grayscale value corresponding to the display driving data.

[0050] Different angles at which liquid crystal molecules deflect affect the proportion of backlight passing through, resulting in different images being displayed.

[0051] In some embodiments, the display device includes a backlight 20, which is electrically connected to a BCON 70. The backlight 20 is configured to emit light based on backlight-driven data. The display panel 10 can display an image based on the backlight provided by the backlight 20.

[0052] In some embodiments, the backlight panel 20 includes a plurality of light-emitting units 201, each light-emitting unit 201 including a light-emitting driving circuit, which is configured to generate a driving signal based on backlight driving data.

[0053] In some embodiments, the backlight assembly 20 further includes a lamp panel, which includes an array of LED beads, at least one of which is electrically connected to form a light-emitting element.

[0054] The light-emitting unit 201 also includes at least one light-emitting element, which is electrically connected to the light-emitting driving circuit and is configured to emit light based on a driving signal.

[0055] In some embodiments, at least one LED bead in the light-emitting element is connected in series to form a light string;

[0056] In other embodiments, at least one LED chip is connected in parallel in the light-emitting element;

[0057] In other embodiments, in the light-emitting element, at least one LED bead is connected in series to form a light string, and at least one light string is connected in parallel.

[0058] Among them, the light string is a light string composed of light beads connected from left to right or from right to left, or it can be a light string composed from top to bottom or bottom to top, or it can be a light string composed of light beads connected in a preset order (e.g., rotation, bending, etc.).

[0059] The LEDs can be composed of MiniLED, MicroLED, WLED, RGB-LED, GB-rLED or QLED (quantum dot).

[0060] In one embodiment, the display device 200 may include a power supply circuit 90, which is coupled to the main controller 80, the image processing chip 40, the MCU 60, the TCON 50, the BCON 70, the backlight panel 20, and the display panel 10, respectively. The power supply circuit 13 is configured to provide corresponding power signals to the main controller 80, the image processing chip 40, the MCU 60, the TCON 50, the BCON 70, the backlight panel 20, and the display panel 10.

[0061] In some embodiments, the power supply terminals of the power supply circuit 90 and each light-emitting unit 201 in the backlight panel 20 are coupled and configured to provide a backlight power supply signal VLED so that the light-emitting element emits light when it receives the backlight power supply signal VLED and the driving signal provided by the light-emitting driving circuit.

[0062] In some embodiments, the light-emitting driving circuit samples the supply voltage of the light-emitting element to determine the supply state of the light-emitting element, which includes an undervoltage state or an overvoltage state. The supply state is fed back to the control circuit, so that the control circuit provides a final feedback signal to the power supply circuit 90 based on the feedback signal. The power supply circuit 90 adjusts the supply voltage based on the final feedback signal.

[0063] In some embodiments, the light-emitting driving circuit transmits feedback signals through a wire between its data output terminal and the control circuit.

[0064] In other embodiments, the light-emitting driving circuit uses its driving data transmission lines to transmit feedback signals in reverse to the control circuit.

[0065] In recent years, due to the advantages of micro-LEDs over AMOLEDs (Active-matrix organic light emitting diodes), such as smaller device size, faster response speed, higher luminous efficiency, stronger stability and longer lifespan, the application of micro-LEDs in displays has developed rapidly and has become a research hotspot in display devices.

[0066] With the increased number of LEDs on the backlight panel 20 using micro LEDs, the control circuit transmits more backlight driving data to the backlight panel 20, increasing the computing power requirements of the control circuit and the time required to transmit backlight driving data to each light-emitting unit. This results in a delay between the time the backlight panel outputs backlight and the time the LCD panel displays the image. When the LCD device displays fast-moving images, the amount of data processed and transmitted by the control circuit further increases, leading to an increased delay time. This can easily cause the backlight to fail to follow the displayed image, resulting in a ghosting phenomenon. In addition, since the display duration of each frame is a preset duration, the increased delay reduces the time the backlight panel outputs backlight, which can easily lead to a decrease in the brightness of the displayed image.

[0067] To address the aforementioned problems, this application provides a display device to solve the technical issues described above. The technical concept of this application is as follows: a liquid crystal display panel is provided with multiple reflective devices. After the control circuit transmits display driving data to the liquid crystal display panel, the liquid crystal display panel can adjust the reflectivity of the reflective devices based on the display driving data. When the backlight provides the same light intensity, reflective devices with different reflectivities reflect light with different intensities. The backlight panel can determine the display driving data based on the different reflective intensities to provide corresponding backlight. This control process eliminates the need for the control circuit to process the backlight display data, reducing the computational power required by the control circuit and lowering its computational cost. Furthermore, this process replaces the data transmission process from the control circuit to the backlight panel with an optical signal transmission process, accelerating data transmission speed, shortening the delay between the backlight panel and the liquid crystal display panel, and improving the image display quality of the liquid crystal display device.

[0068] The display device proposed in this application will be explained in detail below.

[0069] Figure 3 This is a schematic diagram of the structure of a display device provided in accordance with an exemplary embodiment of this application.

[0070] In some embodiments, the display device includes a control circuit 00 configured to output display driving data and control signals;

[0071] The control signal is used to regulate the light emission state of the backlight panel 20.

[0072] The control circuit 00 includes a main controller 80, which is electrically connected to the backlight panel 20 and is configured to output control signals;

[0073] The control circuit 00 includes an image processing chip 40 and is electrically connected to a main controller 80. It is configured to obtain display data and perform image enhancement on the display data.

[0074] The timing controller 50 is electrically connected to the image processing chip 40 and the liquid crystal display panel 10, and is configured to generate display driving data based on the image-enhanced display data.

[0075] In some embodiments, the display device includes a liquid crystal display panel 10, which is electrically connected to a control circuit 00. The liquid crystal display panel 10 is provided with an array of liquid crystal molecules and is configured to adjust the deflection angle of the corresponding liquid crystal molecules based on display driving data.

[0076] In some embodiments, the backlight panel 20 includes a plurality of light-emitting units 201, which are configured to emit reference light during the light control phase of the display cycle;

[0077] The liquid crystal display panel 10 is also provided with multiple reflectors, which correspond to the array of liquid crystal molecules and multiple light-emitting elements. The liquid crystal display panel 10 is also configured to adjust the reflectivity of the reflectors based on display driving data.

[0078] Based on reflectivity, the reference light emitted by the corresponding light-emitting element is reflected;

[0079] The light-emitting unit 201 is configured to receive reflected light, and during the light-emitting phase, it emits backlight corresponding to the light-emitting display driving data based on the light intensity of the reflected light and the control signal.

[0080] The display cycle of the light-emitting unit includes a light control stage and a light-emitting stage.

[0081] Figure 4 This is a schematic diagram illustrating the positional relationship between a reflector and a backlight panel according to an exemplary embodiment of this application. Figure 4 As shown, the reflector 106 is disposed in the corresponding light-shielding area between the arrayed liquid crystal molecules and the backlight panel, and the light-shielding areas of the multiple light-shielding structures correspond to the multiple reflectors 106.

[0082] In some embodiments, the reflector 106 corresponds to the pixel electrode plate 104. When the pixel electrode plate 104 receives an electrical signal, the reflector 106 also receives a corresponding electrical signal.

[0083] The reflector 106 is made of an optional electrochromic material, which is used to reflect light and whose reflectivity is related to the electrical signal it receives.

[0084] In some embodiments, the reflectivity of the reflector 106 increases as the voltage value of the electrical signal increases;

[0085] In other embodiments, the reflectivity of mirror 106 decreases as the voltage value of the electrical signal increases; this characteristic is related to material properties.

[0086] The reflectivity of the mirror is positively correlated with the grayscale value corresponding to the display driving data.

[0087] In some embodiments, a photosensitive device 202 is further provided on the backlight panel. The photosensitive device 202 is configured to receive reflected light emitted by its corresponding reflector 106. The reflected light is the light reflected by the reflector from the reference light.

[0088] The brightness of the backlight is generated by adjusting the intensity of the reflected light.

[0089] The photosensitive device 202 is generally placed in the effective reflective area of ​​the reflector 106, that is, the coverage area of ​​its reflected light path on the backlight plate 20.

[0090] In some embodiments, the light-emitting unit 201 includes a light-emitting driving circuit and at least one light-emitting element 2031; a schematic diagram of the structure of the light-emitting unit 201 is shown below. Figure 5A and Figure 5B As shown.

[0091] The light-emitting driving circuit includes a driving unit 2021 and at least one photosensitive device 202.

[0092] The light-emitting driving circuit is configured to output a reference current signal based on a control signal during the light control phase.

[0093] The light-emitting element 2031 is configured to emit reference light based on a reference current signal;

[0094] The light-emitting driving circuit is configured to receive reflected light and, during the light-emitting phase, output a driving current signal based on the light intensity of the reflected light and a control signal; the driving current signal corresponds to the display driving data.

[0095] The light-emitting element 2031 is also configured to emit backlight based on a drive current signal.

[0096] Among them, the current value of the driving current signal is positively correlated with the grayscale value corresponding to the display driving data.

[0097] In some embodiments, the current values ​​of the driving current signals obtained by the multiple light-emitting elements 2031 corresponding to the same light-emitting driving circuit are the same.

[0098] In another embodiment, at least two of the multiple light-emitting elements 2031 corresponding to the same light-emitting driving circuit have different current values ​​for the driving current signal.

[0099] The difference in current value of the light-emitting element 2031 is determined by the number of photosensitive devices 202 set in the light-emitting driving circuit.

[0100] The number of photosensitive devices 202 in the light-emitting driving circuit can vary, and the correspondence between the photosensitive devices 202 and the driving sub-circuit 2021 can also vary. The following discussion uses... Figure 5A and Figure 5B The circuit structure shown will be used as an example for explanation.

[0101] In some embodiments, the light-emitting driving circuit includes a photosensitive device 202 and a driving unit 2021. The driving unit 2021 includes multiple driving sub-circuits, as shown in the structural diagram. Figure 5A As shown.

[0102] The photosensitive device 202 is electrically connected to multiple driving sub-circuits. The photosensitive device 202 controls the same driving current signal output by multiple driving sub-circuits based on reflected light, which is the same as the backlight generated by multiple light-emitting elements 2031 electrically connected to the multiple driving sub-circuits.

[0103] This circuit structure is generally suitable for display devices that do not require high resolution.

[0104] In some other embodiments, the light-emitting driving circuit includes a plurality of photosensitive devices 202 and a driving unit 2021. The driving unit 2021 includes a plurality of driving sub-circuits, and each photosensitive device 202 is electrically connected to at least one driving sub-circuit, and the driving sub-circuits electrically connected to each photosensitive device 202 do not overlap.

[0105] and Figure 5A The corresponding embodiments are the same, and the backlight brightness generated by the light-emitting element 2031 driven by the driving sub-circuit electrically connected to the same photosensitive device 202 is the same.

[0106] In some embodiments, the number of photosensitive devices 202 in the light-emitting driving circuit is the same as the number of driving sub-circuits, so the current values ​​of the driving current signals generated by each driving sub-circuit are independent of each other. The structural diagram is shown below. Figure 5B As shown.

[0107] The following is combined Figure 6 This application explains the circuit structure of the driving sub-circuit 2022 in the light-emitting driving circuit and its connection relationship with the photosensitive device 202.

[0108] The driver sub-circuit 2022, whose control terminal is electrically connected to the photosensitive device 202 and whose output terminal is electrically connected to at least one light-emitting element 2031, is configured to obtain a control signal and a power supply signal during the light control phase, and output a reference current signal when the control signal is in a first level state; wherein, the default current signal of the power supply signal is the reference current signal.

[0109] The driver sub-circuit 2022 is also configured to, during the light-emitting phase, obtain a power supply signal, a control signal, and a drive signal, and when the control signal is in the second level state, adjust the current value of the power supply signal based on the drive signal to output a drive current signal.

[0110] The current value of the drive current signal is positively correlated with the grayscale corresponding to the display drive data.

[0111] In some embodiments, the driving sub-circuit 2022 includes a first control unit 2025.

[0112] The first control unit 2025 is electrically connected to the light-emitting element 2031 corresponding to the control circuit 00, the power supply circuit 90, and the driving sub-circuit. It is configured to obtain control signals and power signals, and output a reference current signal when the control signal is in the first level state; the power signal includes the reference current signal.

[0113] In some embodiments, the driving sub-circuit 2022 includes a second control unit 2023.

[0114] The second control unit 2023 is electrically connected to the light-emitting element 2031 and photosensitive device 202 corresponding to the control circuit 00, power supply circuit 90, and drive sub-circuit. It is configured to obtain control signal, power supply signal and drive signal. When the control signal is in the second level state, it adjusts the current value of the power supply signal based on the control signal and drive signal and outputs the drive current signal.

[0115] In some embodiments, the first control unit 2025 includes a first transistor M1.

[0116] The first transistor M1 is electrically connected to the first terminal of the power supply circuit 90, its second terminal is electrically connected to the light-emitting element 2031, and its control terminal is electrically connected to the control circuit 00. It is configured to obtain a power signal from its first terminal and a control signal Gate from its control terminal. When the control signal Gate is in the first level state, it is turned on and outputs a power signal.

[0117] exist Figure 6 In the circuit structure shown, the first transistor M1 is an N-type transistor. Therefore, the first transistor M1 is turned on when the control signal Gate is high, and outputs a power supply signal.

[0118] In some embodiments, the second control unit 2023 includes a second transistor M2.

[0119] The first terminal of the second transistor M2 is electrically connected to the power supply circuit 90, and its control terminal is electrically connected to the control circuit 00. It is configured to obtain a power signal from its first terminal and a control signal Gate from its control terminal. When the control signal Gate is in the second level state, it is turned on and outputs a power signal.

[0120] exist Figure 6 In the circuit structure shown, the second transistor M2 is a P-type transistor. Therefore, the second transistor M2 is turned on when the control signal Gate is low, and outputs a power supply signal.

[0121] In some embodiments, the second regulation unit 2023 includes a current control unit 2024.

[0122] The first terminal of the current control unit 2024 and the second terminal of the second transistor M2 are electrically connected. Its control terminal is electrically connected to the photosensitive device 202, and its second terminal is electrically connected to the light-emitting element 2031. It is configured to obtain a power signal from its first terminal and obtain and store a drive signal from its control terminal.

[0123] The current value of the power supply signal is adjusted based on the driving signal to the current value corresponding to the driving current signal.

[0124] In some other embodiments, the positions of the current control unit 2024 and the second transistor M2 connected in series can be interchanged, that is, the connection order is power supply circuit 90, current control unit 2024, second transistor M2 and light-emitting element 2031 in sequence.

[0125] In this circuit structure, the current control unit 2024 can adjust the current value output by the power supply circuit when it obtains the drive signal generated by the photosensitive device 202 based on the obtained light. However, it is easy to adjust the current value of the drive current signal when the photosensitive device 202 mistakenly generates the drive signal based on the ambient light. It is not as energy-efficient as the previous embodiment.

[0126] In some embodiments, the types of the first transistor M1 and the second transistor M2 can be replaced with opposite devices, i.e., the first transistor M1 is a P-type transistor and the second transistor M2 is an N-type transistor.

[0127] In the circuit structure described above, the first transistor M1 and the second transistor M2 receive the same control signal Gate. Therefore, in each display cycle, based on the control signal Gate, one transistor will always be turned on.

[0128] In other embodiments, corresponding control signals Gate can be set for the first transistor M1 and the second transistor M2 respectively, so as to more accurately control the conduction time of each transistor, so that when the first transistor M1 is turned off, the control circuit 00 can further control the light emission brightness of the backlight element 2031 by controlling the conduction time of the second transistor M2.

[0129] In the above circuit structure, the liquid crystal display panel is equipped with multiple reflectors. When the display device displays an image, the control circuit outputs display driving data to the liquid crystal display panel, so that the liquid crystal molecules in the liquid crystal display panel deflect at corresponding angles based on the display driving data. The reflectivity of the reflectors is adjusted based on the display driving data. The controller also outputs control signals to the backlight panel, so that the backlight panel generates reference light based on the control signals during the light control stage. The reflectors provide reflected light of different intensities to the backlight panel based on different reflectivities, so that the light-emitting driving circuit on the backlight panel drives the corresponding light-emitting element to generate the corresponding backlight based on the intensity of the reflected light. Since the backlight generation control process of the backlight panel is based on the reflection of the liquid crystal display panel, the control circuit does not need to process the backlight display data, which reduces the computing power required by the control circuit and reduces the computing cost of the control circuit. The above processing also replaces the data transmission process from the control circuit to the backlight panel with the optical signal transmission process, which speeds up the data transmission speed, shortens the delay between the backlight panel and the liquid crystal display panel, and improves the image display quality of the liquid crystal display device.

[0130] The following is combined Figure 7 The driving signal timing diagram shown, and Figure 8A and Figure 8B The diagram shown illustrates the operation process of the display device provided in this application.

[0131] like Figure 7 As shown, the display cycle T of the display device sequentially includes a light control stage T1 and a light emission stage T2. The light control stage T1 can further include a trigger stage t0, a data writing stage t1, and an adjustment stage t2;

[0132] During the time period corresponding to the trigger stage t0 in the drive signal timing diagram, the display drive data Data is the voltage value corresponding to the default data, the control signal Gate is in a low level state, and the frame start signal is a high-level narrow pulse signal.

[0133] The liquid crystal display panel 10 can determine the start time of the current frame image display cycle based on the frame start signal.

[0134] In some embodiments, the frame start signal can be a Vsync signal, or it can be a time point represented in other forms, such as a software command, etc., without specific limitations here.

[0135] TCON 50 can transmit display driving data (Data) one by one according to the display order of liquid crystal molecules on the liquid crystal display panel 10 based on the frame start signal.

[0136] Taking the progressive display of liquid crystal molecules as an example, TCON 50 outputs progressive display driving data (Data).

[0137] The time interval from the moment the falling edge of the frame start signal triggers in the trigger phase t0 to the moment when the electrical signal waveform corresponding to the display driving data Data in the next phase changes is the display delay of the liquid crystal molecules in that row.

[0138] When the liquid crystal molecules are displayed column by column, the control process of TCON 50 is similar and will not be explained here.

[0139] Since the control signal Gate is low, the first transistor M1 is turned off and the second transistor M2 is turned on.

[0140] The second transistor M2 outputs a power signal to the current control unit 2024.

[0141] Since the backlight panel has not yet emitted light, the reflector 106 cannot output reflected light, the photosensitive device 202 does not output a drive signal, the current control unit 2024 does not output a drive current signal, and the light-emitting element 2031 does not emit light.

[0142] During the data writing phase t1 in the drive signal timing diagram, the frame start signal is a low-level signal. The display drive data Data jumps to the voltage value corresponding to the data to be displayed in the current frame, and the control signal Gate is in a low-level state.

[0143] The liquid crystal display panel obtains display driving data and adjusts the reflectivity of the reflector based on the display driving data;

[0144] The deflection angle of the corresponding liquid crystal molecules is adjusted based on the display driver data.

[0145] Since the control signal Gate is low, the states of the first transistor M1 and the second transistor M2 remain unchanged from the previous stage, and the light-emitting element 2031 still does not emit light.

[0146] The duration of the data writing stage t1 is not less than the time for writing display driver data to the liquid crystal display panel 10 and adjusting the voltage value of the pixel electrode plate 104.

[0147] During the adjustment phase t2 in the drive signal timing diagram, the frame start signal is a low-level signal. The display drive data Data is the voltage value corresponding to the data to be displayed in the current frame, and the control signal Gate is in a high-level state.

[0148] Since the control signal Gate is high, the first transistor M1 is turned on and transmits the power signal obtained from its first terminal to the light-emitting element 2031. The power signal includes a reference current signal, and the current value is a preset reference current value.

[0149] The light-emitting element 2031 emits reference light based on the reference current signal and projects it onto the corresponding reflector 106 so that the corresponding reflector 106 emits reflected light.

[0150] Since the reflectivity of the reflector 106 is adjusted accordingly in the previous stage, different reflectors 106 will reflect different light intensities when obtaining the same reference light intensity.

[0151] The photosensitive device 202 generates corresponding driving signals based on reflected light of different intensities.

[0152] In some embodiments, the driving signal generated by the photosensitive device 202 is a current signal. The current value of the driving signal is different for different reflected light.

[0153] The current control unit 2024 stores the drive signal output by the photosensitive device 202.

[0154] For example, the current control signal 2024 contains a capacitor. By charging the capacitor, the potential difference across the capacitor is adjusted to store different drive signals.

[0155] The corresponding operational status at this stage is as follows: Figure 8A As shown, the first transistor M1, marked with an arrow, is turned on, and the photosensitive device 202 transmits its output drive signal to the current control unit 2024, while the second transistor M2 is turned off.

[0156] During the light-emitting phase T2 in the driving signal timing diagram, the frame start signal is a low-level signal. The display driving data Data is the voltage value corresponding to the data to be displayed in the current frame, and the control signal Gate is in a low-level state.

[0157] Since the control signal Gate is high, the first transistor M1 is turned off.

[0158] Since the control signal Gate is high, the second transistor M2 is turned on, and the power signal obtained from its first terminal is transmitted to the current control unit 2024.

[0159] The current control unit 2024 outputs a drive current signal based on the stored drive signal and power signal;

[0160] The light-emitting element 2031 emits backlight based on the driving current signal, thereby realizing the process of light propagation driving data and controlling the backlight panel to emit light.

[0161] The corresponding operational status at this stage is as follows: Figure 8B As shown, the second transistor M1, marked with an arrow, and the current control unit 2024 are turned on, while the first transistor M1 is turned off.

[0162] In the above technical solution, the LEDs in each zone are controlled by corresponding reflectors, eliminating circuit interference issues. This makes dark areas darker and bright areas brighter, significantly improving the contrast ratio of the LCD display.

[0163] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0164] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A display device, comprising: Power supply circuit, control circuit, LCD display panel, backlight panel; The control circuit is configured to output display drive data; The liquid crystal display panel and the control circuit are electrically connected. The liquid crystal display panel is provided with an array of liquid crystal molecules, which are configured to adjust the deflection angle of the corresponding liquid crystal molecules based on the display driving data. The control circuit is characterized in that it is further configured to output a control signal; The backlight panel includes multiple light-emitting units, each of which includes a light-emitting driving circuit and at least one light-emitting element; The light-emitting driving circuit is configured to output a reference current signal based on the control signal during the light control phase. The light-emitting element is configured to emit reference light based on the reference current signal; The liquid crystal display panel is also provided with a plurality of reflectors, the plurality of reflectors corresponding to the arrayed liquid crystal molecules and the plurality of light-emitting driving circuits, and the liquid crystal display panel is further configured to adjust the reflectivity of the reflectors based on the display driving data; Based on the reflectivity, the reference light emitted by the corresponding light-emitting element is reflected; The light-emitting driving circuit is configured to receive reflected light and, during the light-emitting phase, output a driving current signal based on the light intensity of the reflected light and the control signal; the driving current signal corresponds to the display driving data. The light-emitting element is also configured to emit backlight based on the driving current signal; The display cycle of the light-emitting unit includes the light control stage and the light-emitting stage in sequence.

2. The display device according to claim 1, characterized in that, The liquid crystal display panel also includes multiple light-shielding structures, which correspond to the multiple reflectors; The light-shielding structure is positioned on the side of the liquid crystal molecules away from the backlight panel; The light-shielding structure is configured to provide a corresponding light-shielding area on the liquid crystal display panel; The reflector is located within the corresponding light-shielding area between the arrayed liquid crystal molecules and the backlight panel.

3. The display device according to claim 1, characterized in that, The light-emitting driving circuit includes: A photosensitive device configured to receive reflected light emitted by its corresponding mirror, the reflected light being the light reflected by the mirror from a reference light; Based on the reflected light, a corresponding driving signal is output; A driving sub-circuit, electrically connected to the photosensitive device and at least one light-emitting element, is configured to, during the light-emitting phase, obtain a power supply signal, the control signal, and the driving signal, adjust the current value of the power supply signal based on the driving signal and the control signal, and output the driving current signal; The reflectivity of the mirror is positively correlated with the grayscale value corresponding to the display driving data; The current value of the driving current signal is positively correlated with the grayscale value corresponding to the display driving data.

4. The display device according to claim 3, characterized in that, The driving sub-circuit includes: The first control unit is electrically connected to the light-emitting elements corresponding to the control circuit, the power supply circuit, and the driving sub-circuit, and is configured to obtain a control signal and a power supply signal, and output the reference current signal when the control signal is in a first level state; the power supply signal includes the reference current signal. The second control unit is electrically connected to the light-emitting element and photosensitive device corresponding to the control circuit, the power supply circuit, and the driving sub-circuit. It is configured to obtain the control signal, the power supply signal, and the driving signal. When the control signal is in a second level state, it adjusts the current value of the power supply signal based on the control signal and the driving signal, and outputs the driving current signal.

5. The display device according to claim 4, characterized in that, The first control unit includes: A first transistor, having a first terminal electrically connected to the power supply circuit, a second terminal electrically connected to the light-emitting element, and a control terminal electrically connected to the control circuit, is configured to receive the power supply signal from its first terminal and the control signal from its control terminal, and to conduct when the control signal is at a first level state, thereby outputting the power supply signal.

6. The display device according to claim 4 or 5, characterized in that, The second control unit includes: The second transistor has its first terminal electrically connected to the power supply circuit and its control terminal electrically connected to the control circuit. It is configured to obtain the power signal from its first terminal and the control signal from its control terminal, and to conduct when the control signal is in a second level state, thereby outputting the power signal. A current control unit, whose first terminal is electrically connected to the second terminal of the second transistor, whose control terminal is electrically connected to the photosensitive device, and whose second terminal is electrically connected to the light-emitting element, is configured to obtain the power supply signal from its first terminal and obtain and store the drive signal from its control terminal. The current value of the power supply signal is adjusted based on the driving signal to the current value corresponding to the driving current signal.

7. The display device according to claim 6, characterized in that, The light control stage includes, in sequence, a data writing stage and an adjustment stage; During the data writing phase, the control signal is in a second-level state; The liquid crystal display panel obtains the display driving data and adjusts the reflectivity of the reflector based on the display driving data; The first transistor is turned off based on the control signal; The second transistor is turned on based on the control signal; If the photosensitive device does not receive the reflected light from the corresponding mirror, it controls the corresponding current control unit to turn off. The light-emitting element does not emit light.

8. The display device according to claim 7, characterized in that, During the adjustment phase, the control signal is in a first level state; The first transistor is turned on based on the control signal and outputs the reference current signal based on the power supply signal obtained at its first terminal. The light-emitting element emits reference light based on the reference current signal, so that the corresponding reflector emits reflected light. The second transistor is turned off based on the control signal; The photosensitive device generates a driving signal based on the reflected light; The current control unit stores the drive signal.

9. The display device according to claim 6, characterized in that, During the light-emitting phase, the control signal is in the second level state; The first transistor is turned off based on the control signal; The second transistor is turned on based on the control signal and outputs a power signal; The current control unit outputs the drive current signal based on the stored drive signal and the power supply signal; The light-emitting element emits backlight based on the driving current signal.

10. The display device according to claim 4, characterized in that, The control circuit includes: The main controller, electrically connected to the backlight panel, is configured to output the control signal; An image processing chip, electrically connected to the main controller, is configured to obtain display data and perform image enhancement on the display data; The timing controller, electrically connected to the image processing chip and the liquid crystal display panel, is configured to generate display driving data based on the image-enhanced display data.

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