Display device

Abstract

The application relates to a display device. The display device comprises a display panel, a backlight module and a controller. The backlight module is arranged on the light-incident side of the display panel, and comprises a plurality of backlight sub-zones, each of which comprises at least one light-emitting unit. Each light-emitting unit comprises at least two light-emitting chips, and the two light-emitting chips are used for emitting light beams of different wavelengths. The controller controls at least the backlight module, and is configured to: divide a target image into a plurality of image sub-zones; obtain the gray scale values of each color channel in at least two backlight sub-zones according to the plurality of image sub-zones; and adjust the driving current of the light-emitting chip corresponding to each color channel in the target backlight sub-zone according to the gray scale values of each color channel in the target backlight sub-zone and the related backlight sub-zone.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display device. Background Technology

[0002] With the continuous development of display technology, people have increasingly higher requirements for the quality of display images. Multi-color backlight modules, due to their ability to provide a wide color gamut, have been widely used in many display fields. Multi-color backlight systems use three colors: red (R), green (G), and blue (B). However, they often face challenges such as spatial color bleeding and halo effects when displaying images. Spatial color bleeding refers to the color penetration between adjacent areas due to inaccurate backlight color control, affecting the purity of the image. Halo effects, on the other hand, refer to the edge blurring caused by backlight overflow, affecting display details.

[0003] Traditional technologies often employ complex spatial filters or static adjustments to backlight brightness to mitigate these problems.

[0004] However, using spatial filters or statically adjusting backlight brightness cannot balance cost and display quality. Summary of the Invention

[0005] This application provides a method to address the problem that existing technologies are difficult to reconcile with the effectiveness and cost of reducing spatial color crosstalk and the risk of display halo in display devices.

[0006] In a first aspect, some embodiments provide a display device, including:

[0007] Display panel;

[0008] A backlight module is disposed on the light-incident side of the display panel; the backlight module includes multiple backlight zones, each backlight zone including at least one light-emitting unit; each light-emitting unit includes at least two light-emitting chips, the two light-emitting chips being used to emit light beams of different wavelengths;

[0009] A controller, wherein the controller controls at least the backlight module; and the controller is configured to:

[0010] The target image is divided into multiple image partitions; each of the multiple image partitions corresponds to a multiple backlight partition.

[0011] The grayscale values ​​of each color channel in at least two of the backlight partitions are obtained according to the multiple image partitions; each color channel is set to correspond to the wavelength of the emitted light from each of the light-emitting chips.

[0012] The driving current of the light-emitting chip corresponding to each color channel in the target backlight partition is adjusted according to the grayscale value of each color channel in the target backlight partition and the related backlight partition; the target backlight partition is any one of the multiple backlight partitions; the related backlight partition is the backlight partition among the multiple backlight partitions whose projection of the illumination area of ​​the target beam coincides with the projection of the illumination area of ​​the target beam onto the plane of the multiple backlight partitions; the target beam is the beam emitted by the light-emitting chip in the target backlight partition;

[0013] The method of adjusting the driving current of the light-emitting chip corresponding to each color channel in the target backlight partition according to the grayscale value of each color channel in the target backlight partition and the related backlight partition includes:

[0014] If the difference between the grayscale values ​​corresponding to any identical color channel in the target backlight partition and the related backlight partition is greater than a threshold, the driving current of at least a portion of the light-emitting chips in the target backlight partition is determined based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition. Technical effect:

[0015] The aforementioned display device includes a backlight module, a display panel, and a controller. The backlight module comprises multiple light-emitting chips with different emitted light wavelengths. Therefore, the controller can independently adjust the drive current of the light-emitting chips with different emitted light wavelengths to support flexible control of the backlight module. Furthermore, since spatial crosstalk and halo effects typically occur between two adjacent display areas, real-time acquisition of the grayscale values ​​corresponding to any identical color in the target backlight zone and related backlight zones, and determining whether there is a risk of crosstalk between the target backlight zone and related backlight zones in any color channel based on whether the difference between the grayscale values ​​corresponding to any identical color channel in the target backlight zone and related backlight zones exceeds a preset threshold, can be used. Accordingly, in the event of a crosstalk risk, comprehensively determining the final drive current of the light-emitting chips in the target backlight zone by combining the grayscale values ​​of multiple color channels in the target backlight zone and the adjacent backlight zones can effectively reduce the brightness difference between the target backlight zone and related backlight zones, reduce the risk of spatial crosstalk, and ensure that the actual displayed colors in each zone of the display device closely match the colors of the target image. Furthermore, the display device of this application does not require the addition of extra filtering components, reducing the risk of halo effect and significantly improving display quality without increasing costs.

[0016] In one embodiment, adjusting the driving current of the light-emitting chip corresponding to each color channel in the target backlight partition based on the grayscale value of each color channel in the target backlight partition and the related backlight partition further includes:

[0017] If the difference between the grayscale values ​​corresponding to the same color channel in the target backlight partition and the related backlight partition is not greater than the threshold, the driving current of the light-emitting chip corresponding to the same color channel in the target backlight partition is determined based on the grayscale values ​​of the same color channel in the target backlight partition and the related backlight partition.

[0018] Technical effect: The difference between the grayscale values ​​of the same color channel in the target backlight zone and related backlight zones is no greater than a threshold, which indicates that the risk of spatial color crosstalk and / or display halo between the target backlight zone and related backlight zones is low or non-existent. The driving current of the light-emitting chip corresponding to the same color channel in the target backlight zone is determined based on the grayscale values ​​of the same color channel in the target backlight zone and related backlight zones, without considering the influence of the grayscale values ​​of other color channels. This allows for independent control of the brightness of each channel, enabling the target backlight zone to have a wider color gamut and continuing to leverage the color performance advantages of RGB three-color backlighting.

[0019] In one embodiment, determining the driving current of at least a portion of the light-emitting chips in the target backlight partition based on the grayscale values ​​of all the color channels in the target backlight partition and the related backlight partition includes:

[0020] When the target backlight partition includes a target color channel and a non-target color channel, the driving current of the light-emitting chip corresponding to the target color channel in the target backlight partition is determined based on the grayscale values ​​of all the color channels in the target backlight partition and the related backlight partition.

[0021] The controller is also configured to determine the drive current of the light-emitting chip in the non-target color channel by means of:

[0022] The driving current of the light-emitting chip corresponding to the same color channel in the target backlight partition is determined based on the grayscale value of the same color channel in the target backlight partition and the related backlight partition.

[0023] Wherein, the target color channel is the color channel in the target backlight partition whose difference between the same color channel in the relevant backlight partition and the target backlight partition is greater than the threshold.

[0024] The non-target color channel refers to the color channel in the target backlight partition that is not the target color channel.

[0025] Technical Effect: When the difference between the grayscale values ​​of any identical color channel in the target backlight zone and related backlight zones exceeds a threshold, it indicates a high risk of spatial color crosstalk caused by the brightness difference between the target backlight zone and related backlight zones. Determining the driving current of the light-emitting chip corresponding to the target color channel in the target backlight zone based on the grayscale values ​​of all color channels in both the target and related backlight zones can increase the supplementary lighting effect on the related backlight zones, reduce the brightness difference between the target and related backlight zones, and improve the display effect.

[0026] In one embodiment, determining the driving current of the light-emitting chip corresponding to the same color channel in the target backlight partition based on the grayscale values ​​of the same color channel in the target backlight partition and the related backlight partition includes:

[0027] The first target grayscale value corresponding to the same color channel in the target backlight partition is determined based on the maximum single-channel grayscale value and the average single-channel grayscale value of the same color channel in the target backlight partition and the related backlight partition;

[0028] The driving current of the light-emitting chip corresponding to the same color channel is determined based on the first target grayscale value;

[0029] Wherein, the maximum single-channel grayscale value is the largest of the grayscale values ​​corresponding to the same color channel in the target backlight partition and the related backlight partition;

[0030] The average single-channel grayscale value is the average of the grayscale values ​​corresponding to the same color channel in the target backlight partition and the related backlight partition.

[0031] Technical effect: First, the first target grayscale value corresponding to the same color channel in the target backlight zone is determined based on the maximum and average single-channel grayscale values ​​of the same color channel in the target backlight zone and related backlight zones. Therefore, the first target grayscale value is determined based on the grayscale value of a single color channel, without considering the grayscale values ​​of different color channels, thus maintaining the advantage of a large color gamut in the color backlight display of a single color channel and preserving color performance.

[0032] In one embodiment, determining the first target grayscale value corresponding to the same color channel in the target backlight partition based on the maximum single-channel grayscale value and the average single-channel grayscale value of the same color channel in the target backlight partition and the related backlight partition includes:

[0033] The first target grayscale value corresponding to the same color channel is determined by the sum of the first product of the first weighting coefficient and the first product of the maximum single-channel grayscale value and the second product of the second weighting coefficient and the average single-channel grayscale value.

[0034] Wherein, the sum of the first weighting coefficient and the second weighting coefficient is 1.

[0035] Technical effect: The first target gray level value corresponding to the same color channel is determined by the sum of the first product of the first weighting coefficient and the maximum single-channel gray level value and the second product of the second weighting coefficient and the average single-channel gray level value. This allows for more flexible quantification of the backlight state of any color channel in the target backlight partition, and improves the flexibility of adjusting the driving current of the light-emitting chip corresponding to any color channel in the target backlight partition.

[0036] In one embodiment, determining the driving current of at least a portion of the light-emitting chips in the target backlight partition based on the grayscale values ​​of all the color channels in the target backlight partition and the associated backlight partition includes:

[0037] The driving current of each light-emitting chip in the target backlight partition is determined based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition.

[0038] Technical effect: By determining the driving current of each light-emitting chip in the target backlight zone based on the grayscale values ​​of all color channels in the target backlight zone and related backlight zones, it is possible to achieve unified adjustment of each color channel in the target backlight zone, reducing the difficulty of control.

[0039] In one embodiment, determining the driving current of the light-emitting chip in the target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition includes:

[0040] The second target grayscale value of the light-emitting chip in the target backlight partition is determined based on the maximum full-channel grayscale value and the average full-channel grayscale value of all color channels in the target backlight partition and the related backlight partition;

[0041] The driving current corresponding to the light-emitting chip is determined based on the second target grayscale value of the light-emitting chip;

[0042] Wherein, the maximum full-channel grayscale value is the largest of the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition;

[0043] The average full-channel grayscale value is the average of the grayscale values ​​of all color channels in the target backlight zone and the related backlight zone.

[0044] Technical effect: The second target grayscale value of the light-emitting chip in the target backlight zone is determined based on the maximum and average full-channel grayscale values ​​of all color channels in the target backlight zone and related backlight zones. The driving current of the light-emitting chip is further determined based on the second target grayscale value. When the difference between the grayscale values ​​corresponding to the same color channels in the target backlight zone and related backlight zones is greater than a threshold, the driving current of the light-emitting chip in the target backlight zone is determined by white light. This can reduce the brightness difference between the target backlight zone and related backlight zones and reduce the risk of spatial color crosstalk.

[0045] In one embodiment, determining the second target grayscale value of each light-emitting chip in the target backlight partition based on the maximum and average full-channel grayscale values ​​of all color channels in the target backlight partition and the related backlight partition includes:

[0046] The second target grayscale value of each of the light-emitting chips is determined by the sum of the third product of the first weighting coefficient and the maximum full-channel grayscale value and the fourth product of the second weighting coefficient and the average full-channel grayscale value.

[0047] Wherein, the sum of the first weighting coefficient and the second weighting coefficient is 1.

[0048] Technical effect: The second target grayscale value of each light-emitting chip is determined by the sum of the third product of the first weighting coefficient and the maximum full-channel grayscale value and the fourth product of the second weighting coefficient and the average full-channel grayscale value. The sum of the first weighting coefficient and the second weighting coefficient is 1, which allows for more flexible adjustment of the backlight state of the target backlight zone. This enables more precise adjustment of the grayscale value between the target backlight zone and related backlight zones, thereby reducing the brightness difference between the target backlight zone and related backlight zones, avoiding the risk of color bleeding and display halo, and improving the color display effect.

[0049] In one embodiment, the display panel includes a plurality of pixels, and the controller is further configured to:

[0050] The transmittance of each pixel in the display panel is adjusted according to the driving current of the light-emitting chip in each of the backlight zones, so that the display device can display the target image.

[0051] Technical effect: By adjusting the transmittance of each pixel in the display panel according to the driving current of the light-emitting chips in each backlight zone, it is possible not only to control the brightness of each pixel and adjust the overall brightness of the display panel, but also to compensate for color display changes caused by changes in the driving current of the light-emitting chips in the backlight module by adjusting the transmittance of each pixel, so as to ensure the accuracy and consistency of color and ensure that the display device can ultimately present the ideal target image.

[0052] In one embodiment, the controller is further configured to:

[0053] The threshold is determined based on the grayscale value corresponding to each of the light-emitting chips when the backlight module displays white light.

[0054] Technical Effect: The brightness adjustment of the backlight module is achieved by controlling the driving current of the light source in each emitting area, and the grayscale value directly reflects the brightness level of the emitting area. In the backlight module, different grayscale values ​​correspond to different brightness outputs. Therefore, by monitoring the changes in grayscale values, the brightness status of the backlight module can be indirectly understood. Based on the grayscale values ​​corresponding to each emitting chip when the backlight module displays white light, the upper limit of the backlight module's brightness can be determined. Based on the grayscale values ​​corresponding to each emitting chip when the backlight module displays white light, a threshold can be determined. Based on this threshold, it is possible to accurately determine whether there is a risk of spatial color crosstalk and / or display halo between the target backlight area and related backlight areas, and thus more accurately adjust the driving current of each emitting chip in the target backlight area.

[0055] In one embodiment, the controller is further configured to:

[0056] When the backlight partition displays white light, half of the grayscale value corresponding to each light-emitting chip is used as the threshold.

[0057] Technical effect: By using half of the bit order corresponding to the white light displayed in the backlight zone as the threshold, it is possible to more accurately determine whether the target backlight zone has the risk of spatial color crossover and / or display halo with related backlight zones. Attached Figure Description

[0058] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0059] Figure 1 This is a schematic cross-sectional view of the display device provided in an embodiment of this application;

[0060] Figure 2 This is one of the schematic diagrams illustrating spatial color crosstalk that exists in existing display devices.

[0061] Figure 3 This is the second illustration of spatial color crosstalk present in existing display devices.

[0062] Figure 4 A schematic diagram of display halo in an existing display device equipped with a spatial filter;

[0063] Figure 5 Schematic block diagrams of the structure of a display device provided in some embodiments of this application;

[0064] Figure 6 This application provides schematic block diagrams illustrating the structure of a backlight module in some embodiments.

[0065] Figure 7 A flowchart illustrating how a controller adjusts the drive current of the light-emitting chips corresponding to each color channel in a backlight module, as provided in some embodiments of this application.

[0066] Figure 8 This is a schematic diagram illustrating the target image effect displayed by a display device according to some embodiments of this application;

[0067] Figure 9 A flowchart for some embodiments of this application provides a process for a processor to determine the driving current of a light-emitting chip corresponding to the same color channel in a target backlight partition based on the grayscale value of the same color channel in the target backlight partition and related backlight partitions;

[0068] Figure 10 This is a schematic diagram of grayscale values ​​of some backlight partitions in a backlight module when the difference between the grayscale values ​​corresponding to at least two identical color channels in the target backlight partition and related backlight partitions is not greater than a threshold, according to some embodiments of this application.

[0069] Figure 11 A flowchart for some embodiments of this application showing how a processor determines the driving current of a light-emitting chip in a target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and related backlight partitions;

[0070] Figure 12 This is a schematic diagram of grayscale values ​​of some backlight zones in a backlight module when the difference between the grayscale values ​​corresponding to the same color channels in the target backlight zone and related backlight zones is greater than a threshold, as provided in some embodiments of this application.

[0071] Explanation of reference numerals in the attached figures: 100: Backlight module; 110: Backlight zone; 111: Light-emitting unit; 1111: Light-emitting chip; 200: Display panel; 300: Controller. Detailed Implementation

[0072] The 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 represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0073] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0074] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0075] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0076] The term "module" refers to any known or subsequently developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code that is capable of performing the functions associated with that element.

[0077] This application provides a display device, such as the display screen described above. The display device can be, but is not limited to, various personal computers, laptops, smartphones, tablets, IoT devices, and portable wearable devices. IoT devices can include smart speakers, smart TVs, smart air conditioners, smart in-vehicle devices, etc. Portable wearable devices can include smartwatches, smart bracelets, head-mounted devices, etc.

[0078] The display device in this application embodiment can be a liquid crystal display device. Figure 1 This is a schematic cross-sectional view of a display device provided in an embodiment of this application. (Reference) Figure 1 The liquid crystal display device in this application includes a backlight module and a display panel.

[0079] The backlight module is used to provide a light beam to the display panel, which is used to display images.

[0080] The backlight module is located on the light-incident side of the display panel, and its shape and size are usually matched to the display panel. For example, in the case of a display device such as a television or a mobile terminal, the backlight module is usually rectangular.

[0081] The backlight module adopts a direct-lit backlight module, which includes multiple light-emitting units distributed on the lamp panel. These multiple light-emitting units can be arranged in an array. The direct-lit backlight module can emit light uniformly across the entire light-emitting surface, thereby providing the display panel with sufficiently bright and evenly distributed light, enabling the display panel to display images.

[0082] In this embodiment, the light-emitting unit may include any one of a light-emitting diode (LED), a mini LED, and a micro LED. Mini LED and Micro LED differ from ordinary light-emitting diodes; they specifically refer to miniature light-emitting diode chips, with the size of a Micro LED being smaller than that of a Mini LED. Due to their small size, Mini LEDs allow for better control of dynamic light emission in the backlight module across smaller zones, improving the dynamic contrast of the image. In this embodiment, the single-sided dimension of a single Mini LED chip is less than 500 μm, and the single-sided dimension of a single Micro LED chip is less than 100 μm.

[0083] LEDs, Mini LEDs, and Micro LEDs can be used in structures with a package support (such as POB packaging) or without a package support (such as CSP packaging), and there is no limitation on this.

[0084] The display panel is a transmissive display panel, meaning it does not emit light itself, but it can modulate the transmittance of incident light. Specifically, a liquid crystal display device places liquid crystal between two conductive glass plates. The electric field between the electrodes of the two conductive glass plates drives the liquid crystal molecules to twist, thereby controlling the transmittance of light from the backlight module and displaying the image.

[0085] The display panel can include multiple pixel units. These pixel units can be arranged in an array. Each pixel unit can independently control its light transmittance so that the light transmitted by all pixel units forms the displayed image. By adding a color filter, a color image can be displayed.

[0086] For example, see Appendix Figure 2 , attached Figure 2 One of the schematic diagrams of spatial color crosstalk present in existing display devices is shown, in which Figure 2 Figure (a) shows the target image that needs to be displayed. Figure 2Figure (b) shows the working state of the backlight module 100 and the display panel 200 when displaying the target image. Figure 2 Figure (c) shows the backlight module 100 and the display panel 200 based on Figure 2 The final image shown in Figure (b) depicts the working state.

[0087] As can be seen, when the target image to be displayed contains two colors, and the color difference between the two colors is large, as shown in the attached... Figure 2 As shown in diagram (a), the backlight module 100 emits light of the corresponding white and red colors. After the display panel 200 controls the transmittance of the light beams emitted by each light-emitting chip in the backlight module 100, the image displayed by the display device appears red in the white area S1. Furthermore, due to inaccurate transmittance control by the display panel 200, the transmission channels of light-emitting chips emitting other colors of light besides the red light-emitting chip in the red area S2 may not be completely closed. Alternatively, due to an unsatisfactory color filter effect in the display panel 200, the red area S2 may also appear whitish, affecting the display effect.

[0088] Another example is shown in Appendix Figure 3 , attached Figure 3 This is the second illustration of spatial color crosstalk present in existing display devices. Taking an RGB display device as an example, each color channel is controlled individually. After partitioning the target image, the corresponding backlight brightness (Block-bl-R, Block-bl-G, Block-bl-RB) is calculated using the grayscale values ​​of the pixels in each partition. Figure 3 When the target image shown in (a) is displayed, the backlight partition in the backlight module corresponding to the white image area is displayed as white light, and the backlight partition in the backlight module corresponding to the red image area is displayed as red light. The boundaries between the white and red image areas are clear. At this time, the pixel backlight brightness of each corresponding backlight partition is as follows: Figure 3 As shown in Figure (b), there is no halo effect in the backlight zones corresponding to adjacent black image areas.

[0089] However, in the boundary area between the red and white backlight zones of the backlight module, due to the mismatch in the grayscale values ​​of the RGB channels in the backlight module—for example, the brightness of the beam emitted by the red LED chip is greater than the brightness of the beam emitted by the other color LED chips—the backlight zone that needs to display white appears reddish. The final display effect is as shown in the image. Figure 3 In Figure (c), there is a clear problem of spatial color mixing.

[0090] To reduce the aforementioned spatial color crosstalk issue, a spatial filter is typically added to diffuse the backlight outwards, thereby increasing the supplementary lighting on the target backlit area. (See attached figure.) Figure 4 As shown, where Figure 4 Figure (a) shows the target image that needs to be displayed. Figure 4 Figure (b) shows the color channel display of each backlight zone in the backlight module when a spatial filter is added to diffuse outwards to increase the supplementary light to the target backlight area. Figure 4 Figure (c) shows the final display effect of the display device. It can be seen that although this scheme can improve the color crosstalk problem to a certain extent, it not only requires the introduction of spatial filtering calculation, but also inevitably increases the backlight brightness of unnecessary areas, causing halo phenomenon and increasing energy consumption.

[0091] Based on this, refer to Figure 5 , Figure 5 This is a schematic block diagram of the structure of a display device provided in an embodiment of this application. The display device in this embodiment includes a backlight module 100, a display panel 200, and a controller 300.

[0092] The backlight module 100 is used to provide light beams of different wavelengths to the display panel 200, which is used to display the target image.

[0093] In one embodiment, the backlight module 100 includes a plurality of backlight zones 110. Each backlight zone 110 includes at least one light-emitting unit 111. Each light-emitting unit includes at least two light-emitting chips 1111. The two light-emitting chips 1111 are used to emit light beams of different wavelengths.

[0094] See appendix Figure 6 A schematic block diagram of the backlight module is shown. (Attached) Figure 6 The illustration is based on an example where a backlight module 100 includes 2×2 backlight zones 110, each backlight zone 110 includes 2×2 light-emitting units 111, and each light-emitting unit 111 includes a light-emitting chip 1111 that emits light beams of three different wavelengths. It is understood that in practical applications, the number of backlight zones 110, light-emitting units, and light-emitting chips 1111 can be different and can be flexibly set according to actual needs, and is not limited to the example in this embodiment.

[0095] In one embodiment, the light-emitting chip 1111 in each light-emitting unit is configured to mix light beams of different wavelengths emitted to produce white light. For example, the light-emitting colors of the multiple light-emitting chips 1111 can be R (Red), G (Green), and B (Blue), respectively, with the wavelength of the red light beam approximately between 620nm and 760nm, the wavelength of the green light beam approximately between 495nm and 570nm, and the wavelength of the blue light beam approximately between 450nm and 495nm. It is understood that the light beam colors emitted by the multiple light-emitting chips 1111 can also be red, green, blue, and yellow. For ease of explanation, in the following embodiments of this application, the light-emitting unit in the backlight module 100 includes light-emitting chips 1111 that emit light beams of RGB colors as an example.

[0096] The controller 300 has the functions of data processing and controlling the operation of related panels. For example, the display panel 200 in this embodiment includes multiple display pixels and a driving circuit for driving the multiple display pixels. The controller 300 can control the driving current of the driving circuit to multiple light-emitting chips 1111 based on a preset display control strategy, thereby realizing the brightness control of the backlight module 100.

[0097] In another example, the controller 300 is used to output first display data and second display data. The first display data output by the controller 300 is used to control the display panel 200. The second display data output by the controller 300 is used to control the transmittance of the emitted light in the backlight module 100 to achieve pixel compensation, so that the image finally displayed by the display device is the target image. The first display data and the second display data can interact.

[0098] See appendix Figure 7 In this embodiment, the controller 300 is configured to perform the following steps S701 to S703.

[0099] Step S701: Divide the target image into multiple image partitions.

[0100] Multiple image partitions correspond to multiple backlight partitions 110.

[0101] The entire target image is composed of multiple image partitions. There may be a large or small brightness difference between adjacent image partitions, depending on the content to be displayed in the target image. Each image partition emits a beam of light of a corresponding wavelength through the backlight module 100 and is displayed under the action of the display panel 200. The target image to be displayed by the display device is divided into multiple image partitions, each of which corresponds to a backlight partition 110. The backlight partition 110 is controlled to emit a beam of light of a corresponding wavelength to the corresponding image partition to achieve the display purpose.

[0102] Step S702: Obtain the grayscale values ​​of each color channel in at least two backlight partitions based on multiple image partitions.

[0103] Each color channel is configured to correspond to each light-emitting chip 1111 of the light-emitting unit.

[0104] For example, the explanation will be given with a backlight partition including a first color channel and a second color channel. The first color channel is configured to correspond to the light-emitting chip that emits a first color light beam. The second color channel is configured to correspond to the light-emitting chip that emits a second color light beam.

[0105] Grayscale value refers to the brightness level of each pixel in an image on a specific color channel. Grayscale value is usually represented by a single numerical value, the range of which depends on the bit depth of the image. For example, in an 8-bit image, the grayscale value ranges from 0 to 255, where 0 represents the minimum luminance of the corresponding color channel, and 255 represents the maximum luminance. In the RGB color model, because each color is created by mixing red, green, and blue primary colors in certain proportions, and the brightness of each primary color is determined by its grayscale value, different combinations of grayscale values ​​can produce a variety of colors.

[0106] The grayscale values ​​of the color channels in the backlight module 100 determine the brightness of each pixel on the final display device. By adjusting the grayscale values ​​of the red, green, and blue color channels, precise control over image brightness and contrast can be achieved. Higher grayscale values ​​drive the light-emitting chip to emit a brighter beam, while lower grayscale values ​​drive it to emit a dimmer beam. The grayscale values ​​of the color channels in the backlight module 100 also affect the color accuracy of the target image ultimately displayed by the display device. During the display process, the display data of the target image (including color information and grayscale values) is mapped to the actual display capability of the backlight module 100. Therefore, based on the display data of each image partition in the target image, the grayscale value of each color channel in the corresponding backlight partition 110 can be obtained. This grayscale value indicates that the display device can display the corresponding image partition at the target location. The grayscale value of each color channel is obtained based on the corresponding image partition, which indicates that the display device can ultimately display the target image.

[0107] Step S703: Adjust the driving current of the light-emitting chip 1111 corresponding to each color channel in the target backlight partition according to the grayscale value of each color channel in the target backlight partition and the relevant backlight partition.

[0108] The target backlight zone can be any one of the backlight zones 110 in the backlight module 100. By sequentially using multiple backlight zones 110 in the backlight module 100 as target backlight zones, the target image finally displayed by the display device can be adjusted, avoiding spatial color crosstalk. Furthermore, since spatial filtering is not introduced, the risk of display halo is also effectively reduced.

[0109] The relevant backlight zone can be understood as a backlight zone that may have spatial color mixing risk with the target backlight zone and / or display halo.

[0110] For example, the relevant backlight zone can be a backlight zone among multiple backlight zones whose projection of the illumination area of ​​the target beam coincides with the projection of the target beam onto the plane where the multiple backlight zones are located; the target beam is the beam emitted by the light-emitting chip in the target backlight zone.

[0111] Another example is that the relevant backlight zone can be a backlight zone among multiple backlight zones that has no other backlight zones between it and the target backlight zone.

[0112] As another example, the relevant backlight zone can be one of multiple backlight zones that shares a boundary edge with the target backlight zone. The number of relevant backlight zones can vary depending on the position of the target backlight zone within the backlight module 100. For instance, assuming the target backlight zone is located at one of the four corners of the backlight module 100, the number of backlight zones sharing a boundary edge with the target backlight zone would be two. One or two of these can be flexibly selected as the relevant backlight zones according to actual needs.

[0113] Assuming the target backlight zone is located in the edge area of ​​backlight module 100 excluding the four corners, then there are 3 backlight zones sharing the boundary edge with the target backlight zone. One, two, or three of these can be flexibly selected as the relevant backlight zones according to actual needs.

[0114] Assuming the target backlight zone is located in a position on the backlight module 100 excluding the four corners and edge areas, the number of backlight zones sharing the boundary edge with the target backlight zone is 4. One, two, three, or four of these can be flexibly selected as the relevant backlight zones according to actual needs.

[0115] The number of relevant backlight areas can be flexibly set based on the risk of spatial color mixing with the target backlight zone and / or the possibility of display halo, and is not limited to the above example.

[0116] The driving current of the light-emitting chip 1111 corresponding to each color channel in the target backlight partition is adjusted according to the grayscale value of each color channel in the target backlight partition and the related backlight partition, so as to realize the independent adjustment of each color channel in the target backlight partition and more accurately adjust the backlight of the backlight module 100.

[0117] In one embodiment, the driving current of the color channel to be adjusted in the target backlight partition can be adjusted based on the grayscale values ​​of the same color channels in the target backlight partition and related backlight partitions. For example, the driving current of the red color channel in the target backlight partition can be adjusted based on the grayscale value of the red color channel in the related backlight partition. Exemplarily, in one embodiment, step S603, adjusting the driving current of the light-emitting chip 1111 corresponding to each color channel in the target backlight partition based on the grayscale values ​​of each color channel in the target backlight partition and related backlight partitions, includes: if the difference between the grayscale values ​​corresponding to any identical color channel in the target backlight partition and related backlight partitions is greater than a threshold, determining the driving current of at least a portion of the light-emitting chips 1111 in the target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and related backlight partitions.

[0118] If the difference between the grayscale values ​​of any identical color channel in the target backlight zone and the related backlight zone is greater than a threshold, it can indicate that there is a risk of spatial color crosstalk and / or display halo between the target backlight zone and the related backlight zone. At this time, the driving current of at least some of the light-emitting chips 1111 in the target backlight zone is determined based on the grayscale values ​​of all color channels in the target backlight zone and the related backlight zone, which can accurately adjust the overall grayscale value of the target backlight zone.

[0119] For example, if the difference between the grayscale value of the red color channel in the target backlight zone and the grayscale value of the red color channel in the relevant backlight zone is greater than a threshold, then at least the driving current of the light-emitting chip 1111 corresponding to the red color channel in the target backlight zone is adjusted, thereby realizing the brightness adjustment of the entire target backlight zone and avoiding spatial color crosstalk and display halo.

[0120] In this embodiment, the backlight module 100 includes multiple light-emitting chips 1111 with different emitted light wavelengths. Therefore, the controller 300 can independently adjust the driving current of the light-emitting chips 1111 with different emitted light wavelengths to support flexible control of the backlight module 100.

[0121] Furthermore, since spatial color crosstalk and halo effects usually occur between two adjacent display areas, the grayscale values ​​corresponding to any same color in the target backlight zone and related backlight zones can be obtained in real time. Based on whether the difference between the grayscale values ​​corresponding to any same color channel in the target backlight zone and related backlight zones is greater than a preset threshold, it can be determined whether there is a risk of color crosstalk between the target backlight zone and related backlight zones in any color channel.

[0122] In another embodiment, adjustment can also be made based on the grayscale values ​​of color channels in the target backlight zone and related backlight zones that are different from the color channel to be adjusted. For example, the drive current of the red color channel in the target backlight zone can be adjusted based on the grayscale values ​​of the red, blue, and green color channels in the related backlight zone.

[0123] In the presence of color crosstalk risk, the final driving current of the light-emitting chip 1111 in the target backlight partition is determined by combining the grayscale values ​​of multiple color channels in the target backlight partition and the backlight partition adjacent to the target backlight partition. This can effectively reduce the brightness difference between the target backlight partition and related backlight partitions, reduce the risk of spatial color crosstalk, and make the actual display color of the display device in each partition close to the color of the target image.

[0124] refer to Figure 3 , Figure 4 and attached Figure 8 , Figure 8 This diagram illustrates the target image effect displayed by the display device in this embodiment. Figure 8 Figure (a) in the figure is the target image, with appended... Figure 8 Figure (b) shows the display brightness of the color channels of each backlight zone 110 in the backlight module 100. Figure 8 Figure (c) in the diagram shows the image displayed on the display device. It can be seen that, compared to the attached diagram... Figure 3 Figure (c) and appendix Figure 4 As shown in Figure (c), the display device in this embodiment displays colors in each zone that are close to the colors of the target image to be displayed, which significantly improves the display quality. Furthermore, the display device in this embodiment does not require additional filtering components, reducing the risk of halo effects and significantly improving display quality without increasing costs.

[0125] In one embodiment, adjusting the driving current of the light-emitting chip corresponding to each color channel in the target backlight partition based on the grayscale value of each color channel in the target backlight partition and the related backlight partition further includes: determining the driving current of the light-emitting chip corresponding to the same color channel in the target backlight partition based on the grayscale value of the same color channel in the target backlight partition and the related backlight partition, provided that the difference between the grayscale values ​​corresponding to the same color channel in the target backlight partition and the related backlight partition is not greater than a threshold.

[0126] The difference between the grayscale values ​​corresponding to the same color channel in the target backlight partition and the related backlight partition is not greater than the threshold. This can be either that the difference between the grayscale values ​​corresponding to the same color channel in the target backlight partition and the related backlight partition is not greater than the threshold, or that the difference between the grayscale values ​​corresponding to the same color channel in the target backlight partition and the related backlight partition is not greater than the threshold.

[0127] For example, the difference between the grayscale value of the red color channel in the target backlight zone and the grayscale value of the red color channel in the relevant backlight zone may not be greater than a threshold, the difference between the grayscale value of the green color channel in the target backlight zone and the grayscale value of the green color channel in the relevant backlight zone may not be greater than a threshold, and the difference between the grayscale value of the blue color channel in the target backlight zone and the grayscale value of the blue color channel in the relevant backlight zone may not be greater than a threshold.

[0128] In another example, any one or two of the following values ​​are not greater than the threshold: the difference between the grayscale value of the red color channel in the target backlight zone and the grayscale value of the red color channel in the relevant backlight zone; the difference between the grayscale value of the green color channel in the target backlight zone and the grayscale value of the green color channel in the relevant backlight zone; and the difference between the grayscale value of the blue color channel in the target backlight zone and the grayscale value of the blue color channel in the relevant backlight zone.

[0129] At this point, the risk of spatial color mixing and / or display halo between the target backlight zone and related backlight zones is low or nonexistent.

[0130] The driving current of the light-emitting chip corresponding to the same color channel in the target backlight zone is determined based on the grayscale values ​​of the same color channel in the target backlight zone and related backlight zones. For example: the driving current of the light-emitting chip corresponding to the grayscale value of the red color channel in the target backlight zone is determined based on the grayscale values ​​of the red color channel in the target backlight zone and related backlight zones; the driving current of the light-emitting chip corresponding to the grayscale value of the green color channel in the target backlight zone is determined based on the grayscale values ​​of the green color channel in the target backlight zone and related backlight zones; the driving current of the light-emitting chip corresponding to the grayscale value of the blue color channel in the target backlight zone is determined based on the grayscale values ​​of the blue color channel in the target backlight zone and related backlight zones.

[0131] In this embodiment, if the difference between the grayscale values ​​corresponding to the same color channel in the target backlight partition and the related backlight partition is not greater than the threshold, it indicates that the risk of spatial color crosstalk and / or display halo between the target backlight partition and the related backlight partition is small or non-existent. The driving current of the light-emitting chip corresponding to the same color channel in the target backlight partition is determined based on the grayscale values ​​of the same color channel in the target backlight partition and the related backlight partition, without considering the influence of the grayscale values ​​of other color channels. This allows for independent control of the brightness of each channel, enabling the target backlight partition to have a larger color gamut and continue to leverage the color performance advantages of RGB three-color backlight.

[0132] The driving current of at least some of the light-emitting chips in the target backlight zone is determined based on the grayscale values ​​of all color channels in the target backlight zone and related backlight zones. This can be done by determining the driving current of all light-emitting chips in the target backlight zone based on the grayscale values ​​of all color channels in the target backlight zone and related backlight zones, or by determining the driving current of all light-emitting chips in the target backlight zone whose grayscale value difference with the related backlight zones is greater than a threshold based on the grayscale values ​​of all color channels in the target backlight zone and related backlight zones.

[0133] For example, in one embodiment, determining the driving current of at least a portion of the light-emitting chips in the target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and related backlight partitions includes: when the target backlight partition includes a target color channel and non-target color channels, determining the driving current of the light-emitting chip corresponding to the target color channel in the target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and related backlight partitions.

[0134] The controller is also configured to determine the drive current of the light-emitting chip in the non-target color channel by determining the drive current of the light-emitting chip corresponding to the same color channel in the target backlight zone based on the grayscale value of the same color channel in the target backlight zone and the relevant backlight zone.

[0135] The target color channel is the color channel in the target backlight partition whose difference from the same color channel in the relevant backlight partition is greater than a threshold.

[0136] Non-target color channels are color channels in the target backlight zone other than the target color channel.

[0137] In this embodiment, when the difference between the grayscale values ​​corresponding to any identical color channel in the target backlight partition and the related backlight partition is greater than a threshold, it indicates that the risk of spatial color crossing caused by the brightness difference between the target backlight partition and the related backlight partition is relatively high. At this time, the driving current of the light-emitting chip corresponding to the target color channel in the target backlight partition is determined according to the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition. This can increase the supplementary lighting effect on the related backlight partition, reduce the brightness difference between the target backlight partition and the related backlight partition, and improve the display effect.

[0138] Furthermore, in this embodiment, the driving current of the light-emitting chip corresponding to the target color channel in the target backlight partition is determined based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition.

[0139] For example, assuming the difference between the grayscale value of the red color channel in the target backlight partition and the red color channel in the related backlight partition is greater than a threshold, and the target color channel is the red color channel, the driving current of the light-emitting chip corresponding to the red color channel in the target backlight partition is determined based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition.

[0140] In another example, if the difference in grayscale value between the red color channel in the target backlight partition and the red color channel in the related backlight partition is greater than a threshold, the driving current of the light-emitting chip corresponding to the red color channel in the target backlight partition is determined based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition.

[0141] If the difference in grayscale value between the green color channel in the target backlight partition and the green color channel in the related backlight partition is not greater than the threshold, then the driving current of the light-emitting chip corresponding to the green color channel in the target backlight partition is determined based on the grayscale value of the green color channel in the target backlight partition and the related backlight partition.

[0142] Based on this, in this embodiment, the driving current of the light-emitting chip corresponding to each color channel in the target backlight partition can be independently controlled, which can more accurately adjust the backlight of the backlight module.

[0143] The driving current of the light-emitting chip corresponding to the same color channel in the target backlight partition is not unique, as it is determined by the grayscale value of the same color channel in the target backlight partition and related backlight partitions. In practical applications, it can be flexibly set according to the processor's processing logic.

[0144] Exemplarily, in one embodiment, see Appendix Figure 9 , attached Figure 9 The flowchart illustrates a process by which the processor determines the driving current of the light-emitting chip corresponding to the same color channel in the target backlight partition based on the grayscale value of the same color channel in the target backlight partition and related backlight partitions.

[0145] In this embodiment, the processor determines the driving current of the light-emitting chip corresponding to the same color channel in the target backlight partition based on the grayscale value of the same color channel in the target backlight partition and the related backlight partition, including the following steps S901 to S902.

[0146] S901, determine the first target grayscale value corresponding to the same color channel in the target backlight partition based on the maximum single-channel grayscale value and the average single-channel grayscale value of the same color channel in the target backlight partition and related backlight partitions.

[0147] The maximum single-channel grayscale value is the largest grayscale value among the target backlight zone and the related backlight zones corresponding to the same color channel. The average single-channel grayscale value is the average of the grayscale values ​​among the target backlight zone and the related backlight zones corresponding to the same color channel.

[0148] For example, see Appendix Figure 10 , attached Figure 10 This diagram illustrates the grayscale values ​​of some backlight zones in the backlight module when the difference between the grayscale values ​​corresponding to each identical color channel in the target backlight zone and related backlight zones is no greater than a threshold. Taking an 8-bit depth image as an example, the corresponding grayscale value range for each color channel is 0 to 255. (Attached) Figure 10 The following explanation uses four backlight zones, including those sharing a boundary with the target backlight zone, as an example. Each backlight zone includes one light-emitting unit 111, and each light-emitting unit 111 includes an RGB light-emitting chip. Specifically, the following examples illustrate the following: in the target backlight zone P1, all color channels have a grayscale value of 127; in the relevant backlight zone P2, the red and green color channels have a grayscale value of 127, and the blue color channel has a grayscale value of 0; in the relevant backlight zone P3, the red color channel has a grayscale value of 0, and the green and blue color channels have a grayscale value of 127; in the relevant backlight zone P4, the red color channel has a grayscale value of 255, and the green and blue color channels have a grayscale value of 127; and in the relevant backlight zone P5, the red and blue color channels have a grayscale value of 127, and the green color channel has a grayscale value of 0.

[0149] Assuming a threshold of 128, the difference between the grayscale values ​​of the same color channel in each target backlight zone and related backlight zones is no greater than 128. At this point, the maximum single-channel grayscale value of the red color channel is the maximum of 255 among: 127 (grayscale value of the red color channel in target backlight zone P1), 127 (grayscale value of the red color channel in related backlight zone P2), 0 (grayscale value of the red color channel in related backlight zone P3), 255 (grayscale value of the red color channel in related backlight zone P4), and 127 (grayscale value of the red color channel in related backlight zone P5). The average single-channel grayscale value of the red color channel is (127+127+0+255+127) / 5 = 127.2.

[0150] The first target grayscale value is used to characterize the backlight state of the target backlight zone when the difference between the grayscale values ​​corresponding to the same color channel in the target backlight zone and related backlight zones is not greater than a threshold. The backlight state of the target backlight zone can be quantified by the first target grayscale value.

[0151] Step S902: Determine the driving current of the light-emitting chip corresponding to the same color channel based on the first target grayscale value.

[0152] There is a preset correspondence between the first target grayscale value and the driving current, which can be determined according to the luminous characteristics of the backlight module used. This application does not make any specific limitation on this.

[0153] For example, in step S901, the first target grayscale value of the red color channel in the target backlight partition is determined, and in step S902, the driving current of the light-emitting chip corresponding to the red color channel in the target backlight partition is determined based on the first target grayscale value of the red color channel. Similarly, the driving current of the light-emitting chip corresponding to each color channel in the target backlight partition can be determined.

[0154] In this embodiment, the first target grayscale value corresponding to the same color channel in the target backlight partition is first determined based on the maximum single-channel grayscale value and the average single-channel grayscale value of the same color channel in the target backlight partition and related backlight partitions. The first target grayscale value is determined based on the grayscale value of a single same color channel and does not consider the grayscale values ​​of different color channels. This can maintain the advantage of a large color range in the color backlight display of a single color channel and maintain color performance.

[0155] Furthermore, by quantizing the backlight state of any color channel in the target backlight zone using the first target grayscale value, the driving current of the corresponding light-emitting chip for that color channel can be determined more accurately based on the quantized reference value (i.e., the first target grayscale value), thereby achieving precise adjustment of the brightness of the target backlight zone.

[0156] The method for determining the first target grayscale value is not unique. As long as it is determined based on the grayscale value of a single color channel, it falls within the inventive concept of this application. For example, in one embodiment, determining the first target grayscale value corresponding to the same color channel in the target backlight partition based on the maximum single-channel grayscale value and the average single-channel grayscale value of the same color channel in the target backlight partition and related backlight partitions includes: determining the first target grayscale value corresponding to the same color channel based on the sum of the first product of a first weighting coefficient and the maximum single-channel grayscale value and the second product of a second weighting coefficient and the average single-channel grayscale value; wherein, the sum of the first weighting coefficient and the second weighting coefficient is 1.

[0157] For example, the first target grayscale value of the red color channel in the target backlight partition can be represented as Block_bl_r=α*Max_r+(1-α)*Avg_r; the first target grayscale value of the green color channel in the target backlight partition can be represented as Block_bl_g=α*Max_g+(1-α)*Avg_g; and the first target grayscale value of the blue color channel in the target backlight partition can be represented as Block_bl_b=α*Max_b+(1-α)*Avg_b.

[0158] Wherein, Block_bl_r is the first target grayscale value of the red color channel, Max_r is the maximum single-channel grayscale value of the red color channel, Avg_r is the average single-channel grayscale value of the red color channel, Block_bl_g is the first target grayscale value of the green color channel, Max_g is the maximum single-channel grayscale value of the green color channel, Avg_g is the average single-channel grayscale value of the green color channel, Block_bl_b is the first target grayscale value of the blue color channel, Max_b is the maximum single-channel grayscale value of the blue color channel, Avg_b is the average single-channel grayscale value of the blue color channel, α represents the first weighting coefficient, 1-α represents the second weighting coefficient, and α is greater than or equal to 0.

[0159] In this embodiment, the first target gray level value corresponding to the same color channel is determined by the sum of the first product of the first weighting coefficient and the maximum single-channel gray level value and the second product of the second weighting coefficient and the average single-channel gray level value. This allows for more flexible quantification of the backlight state of any color channel in the target backlight partition, and improves the flexibility of adjusting the driving current of the light-emitting chip corresponding to any color channel in the target backlight partition.

[0160] In one embodiment, determining the driving current of at least some of the light-emitting chips in the target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and related backlight partitions includes: determining the driving current of each light-emitting chip in the target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and related backlight partitions.

[0161] Unlike the previous embodiment, in this embodiment, if the difference between the grayscale value of any color channel in the target backlight partition and the related backlight partition is greater than a threshold, then the driving current of the light-emitting chip corresponding to all color channels in the target backlight partition is determined based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition.

[0162] For example, if the difference between the grayscale value of the red color channel in the target backlight partition and the grayscale value of the red color channel in the related backlight partition is greater than a threshold, while the difference between the grayscale value of the blue color channel in the target backlight partition and the grayscale value of the blue color channel in the related backlight partition is not greater than a threshold, and the difference between the grayscale value of the green color channel in the target backlight partition and the grayscale value of the green color channel in the related backlight partition is also not greater than a threshold, then the driving current of the light-emitting chips corresponding to the red, blue, and green color channels in the target backlight partition is determined based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition.

[0163] Based on this, this embodiment can achieve unified adjustment of each color channel of the target backlight zone, reducing the difficulty of control.

[0164] In one embodiment, see Appendix Figure 11 , attached Figure 11 The flowchart illustrates a process by which a processor determines the driving current of a light-emitting chip in a target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and related backlight partitions. The determination of the driving current of the light-emitting chip in the target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and related backlight partitions includes the following steps S1101 to S1102.

[0165] Step S1101: Determine the second target grayscale value of the light-emitting chip in the target backlight partition based on the maximum full-channel grayscale value and the average full-channel grayscale value of all color channels in the target backlight partition and related backlight partitions.

[0166] Among them, the maximum full-channel grayscale value is the largest grayscale value among all color channels in the target backlight zone and related backlight zones; the average full-channel grayscale value is the average of the grayscale values ​​of all color channels in the target backlight zone and related backlight zones.

[0167] For example, see Appendix Figure 12 , attached Figure 12 This diagram illustrates the grayscale values ​​of some backlight zones in the backlight module when the difference between the grayscale values ​​corresponding to the same color channels in the target backlight zone and related backlight zones exceeds a threshold. Taking an 8-bit depth image as an example, the corresponding grayscale value range for each color channel is 0 to 255. Figure 12The following explanation uses four backlight zones, including those sharing a boundary with the target backlight zone, as an example. Each backlight zone includes one light-emitting unit 111, and each light-emitting unit 111 includes an RGB light-emitting chip. Specifically, examples are provided for: target backlight zone P1' where the grayscale values ​​of the red and blue color channels are both 255 and the green color channel is 127; related backlight zone P2' where the grayscale values ​​of the red and green color channels are both 127 and the blue color channel is 0; related backlight zone P3' where the grayscale value of the red color channel is 0, the grayscale value of the green color channel is 255 and the blue color channel is 127; related backlight zone P4' where the grayscale value of the red color channel is 255 and the grayscale values ​​of both the green and blue color channels are 127; and related backlight zone P5' where the grayscale values ​​of the red and blue color channels are both 127 and the green color channel is 0.

[0168] Assuming a threshold of 128, the difference between the grayscale values ​​of the red color channel of the target backlight partition P1' and the red color channel of the related backlight partition P3' is 255, which is greater than 128. Similarly, the difference between the blue color channel of the target backlight partition P1' and the blue color channel of the related backlight partition P2' is also 255, which is greater than 128. Therefore, the maximum full-channel grayscale value is the maximum value among the grayscale values ​​of the three color channels in the target backlight partition P1' and the related backlight partitions P2' to P5': 255, 127, 255, 127, 127, 0, 0, 255, 127, 255, 127, 127, 127, 0, 127 – 255.

[0169] The average grayscale value across all channels is the grayscale value of the three color channels in the target backlight zone P1' and the related backlight zones P2'~P5', which is the average of 255, 127, 255, 127, 127, 0, 0, 255, 127, 255, 127, 127, 127, 0, 127 - (255+127+255+127+127+0+0+255+127+255+127+127+127+0+127) / 15≈135.73.

[0170] The second target grayscale value is used to characterize the backlight state of the target backlight zone when the difference between the grayscale values ​​corresponding to the same color channel in the target backlight zone and related backlight zones is greater than a threshold. The backlight state of the target backlight zone can be quantified by the second target grayscale value.

[0171] Step S1102: Determine the driving current of the corresponding light-emitting chip based on the second target grayscale value of the light-emitting chip.

[0172] Similar to the first target grayscale value, there is also a preset correspondence between the second target grayscale value and the driving current in this embodiment. The driving current of the corresponding light-emitting chip can be determined according to the second target grayscale value of each light-emitting chip by means of table lookup, etc., but is not limited to this.

[0173] For example, taking the determination of the driving current of the light-emitting chip corresponding to the target color channel in the target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition as an example, if the difference between the grayscale value of the red color channel in the target backlight partition and the grayscale value of the red color channel in the related backlight partition is greater than a threshold, then the second target grayscale value of the light-emitting chip corresponding to the red color channel in the target backlight partition is determined based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition, and the driving current of the light-emitting chip corresponding to the red color channel in the target backlight partition is determined based on the second target grayscale value of the light-emitting chip corresponding to the red color channel.

[0174] In another example, taking the determination of the driving current of each light-emitting chip in the target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition as an example, if the difference between the grayscale values ​​of any color channel in the target backlight partition and the related backlight partition is greater than a threshold, then the second target grayscale value of the light-emitting chip corresponding to all color channels in the target backlight partition is determined based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition. At this time, the second target grayscale values ​​of the light-emitting chips corresponding to all color channels in the target backlight partition are the same, and the driving current of the light-emitting chips corresponding to each color channel in the target backlight partition is the same.

[0175] In this embodiment, the second target grayscale value of the light-emitting chip in the target backlight partition is determined based on the maximum and average full-channel grayscale values ​​of all color channels in the target backlight partition and related backlight partitions. Furthermore, the driving current of the light-emitting chip is determined based on the second target grayscale value. When the difference between the grayscale values ​​corresponding to the same color channels in the target backlight partition and related backlight partitions is greater than a threshold, the driving current of the light-emitting chip in the target backlight partition is determined by white light, thereby reducing the brightness difference between the target backlight partition and related backlight partitions and reducing the risk of spatial color crosstalk.

[0176] In addition, corresponding to the first target grayscale value, the backlight state of the target backlight zone is quantized by the second target grayscale value. Based on the quantized second target grayscale value, the driving current of the light-emitting chip in the target backlight zone can be determined more accurately, thereby achieving precise adjustment of the target backlight zone.

[0177] The method for determining the second target grayscale value is not unique. As long as it is determined based on the grayscale values ​​of all color channels, it falls within the inventive concept of this application. For example, in one embodiment, determining the second target grayscale value of each light-emitting chip in the target backlight partition based on the maximum and average full-channel grayscale values ​​of all color channels in the target backlight partition and related backlight partitions includes: determining the second target grayscale value of each light-emitting chip based on the sum of the third product of the first weighting coefficient and the maximum full-channel grayscale value and the fourth product of the second weighting coefficient and the average full-channel grayscale value; wherein the sum of the first weighting coefficient and the second weighting coefficient is 1.

[0178] For example, the second target grayscale value of each color channel in the target backlight partition can be expressed as Block_bl_X=α'*Max_(r,g,b)+(1-α')*Avg_(r,g,b), where X in Block_bl_X can be any one of the red color channel r, the green color channel g, and the blue color channel b. Max_(r,g,b) is the maximum full-channel grayscale value, Avg_(r,g,b) is the average full-channel grayscale value, α' represents the third weighting coefficient, 1-α' represents the fourth weighting coefficient, and α' is greater than or equal to 0.

[0179] In this embodiment, the second target grayscale value of each light-emitting chip is determined by the sum of the third product of the first weighting coefficient and the maximum full-channel grayscale value and the fourth product of the second weighting coefficient and the average full-channel grayscale value. The sum of the first weighting coefficient and the second weighting coefficient is 1, which allows for more flexible adjustment of the backlight state of the target backlight zone, so as to more accurately adjust the grayscale value between the target backlight zone and the related backlight zones, thereby reducing the brightness difference between the target backlight zone and the related backlight zones, avoiding the risk of color bleeding and display halo, and improving the color display effect.

[0180] In one embodiment, the display panel includes a plurality of pixels, and the controller is further configured to adjust the transmittance of each pixel in the display panel according to the driving current of the light-emitting chip in each backlight zone, so as to enable the display device to display a target image.

[0181] The display panel is used to display target images. Under the control of the controller, the arrangement of liquid crystal molecules in the display panel changes, thereby adjusting the transmittance of each pixel and displaying different colors and brightness. The brightness of the backlight module changes when the driving current of the corresponding light-emitting chip changes. When the driving current increases, the emitted light intensifies, causing the entire backlight module to brighten. The transmittance of each pixel in the display panel determines how much light that pixel can transmit.

[0182] Furthermore, different colors of light have different wavelengths and energy distributions, which affect their transmission through the display panel to varying degrees. Therefore, adjusting the transmittance of the display panel accordingly allows for precise control of different colors of light, thereby optimizing color accuracy and vibrancy. When the driving current of each light-emitting chip in the backlight module changes, it also alters the color temperature or spectral distribution of the light, causing color deviations or distortions on the display panel. Therefore, in this embodiment, adjusting the transmittance of each pixel in the display panel based on the driving current of the light-emitting chips in each backlight zone not only controls the brightness of each pixel and adjusts the overall brightness of the display panel, but also compensates for color display changes caused by variations in the driving current of the light-emitting chips in the backlight module. This ensures color accuracy and consistency, guaranteeing that the display device can ultimately present the ideal target image.

[0183] In one embodiment, the controller is further configured to determine a threshold based on the grayscale value corresponding to each light-emitting chip when the backlight module displays white light.

[0184] Brightness adjustment of the backlight module is achieved by controlling the driving current of light in each emitting area, and the grayscale value directly reflects the brightness level of the emitting area. In the backlight module, different grayscale values ​​correspond to different brightness outputs. Therefore, by monitoring changes in grayscale values, the brightness status of the backlight module can be indirectly understood. Based on the grayscale values ​​corresponding to each emitting chip when the backlight module displays white light, the upper limit of the backlight module's brightness can be determined. Based on the grayscale values ​​corresponding to each emitting chip when the backlight module displays white light, a threshold can be determined. Based on this threshold, it is possible to accurately determine whether there is a risk of spatial color crosstalk and / or display halo between the target backlight zone and related backlight zones, and thus more accurately adjust the driving current of each emitting chip in the target backlight zone.

[0185] In one embodiment, the controller is further configured to use half of the grayscale value corresponding to each light-emitting chip as a threshold when the backlight partition displays white light.

[0186] For example, taking a grayscale value of 255 for each light-emitting chip when the backlight partition displays white light, the corresponding threshold could be 127.5 or 128. In practical applications, the threshold can be flexibly set according to the light-emitting characteristics of the display panel and the backlight module, and is not limited to the above example.

[0187] In this embodiment, half of the bit order corresponding to the white light displayed by the backlight partition is used as the threshold, which can more accurately determine whether the target backlight partition has the risk of spatial color mixing and / or display halo with the related backlight partition.

[0188] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0189] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0190] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A display device, characterized in that, include: Display panel; A backlight module is located on the light-incident side of the display panel; The backlight module includes multiple backlight zones, and each backlight zone includes at least one light-emitting unit; The light-emitting unit includes at least two light-emitting chips, and the two light-emitting chips are used to emit light beams of different wavelengths; A controller, wherein the controller controls at least the backlight module; and the controller is configured to: The target image is divided into multiple image partitions; each of the multiple image partitions corresponds to a multiple backlight partition. The grayscale values ​​of each color channel in at least two of the backlight partitions are obtained based on the multiple image partitions. Each of the color channels is set to correspond to the wavelength of the emitted light from each of the light-emitting chips; The driving current of the light-emitting chip corresponding to each color channel in the target backlight partition is adjusted according to the grayscale value of each color channel in the target backlight partition and the related backlight partition. The target backlight zone is any one of the multiple backlight zones; the related backlight zone is the backlight zone among the multiple backlight zones whose projection of the illumination area of ​​the target beam coincides with the projection of the multiple backlight zones on the plane where the backlight zones are located; the target beam is the beam emitted by the light-emitting chip in the target backlight zone. The method of adjusting the driving current of the light-emitting chip corresponding to each color channel in the target backlight partition according to the grayscale value of each color channel in the target backlight partition and the related backlight partition includes: If the difference between the grayscale values ​​corresponding to any identical color channel in the target backlight partition and the related backlight partition is greater than a threshold, the driving current of at least a portion of the light-emitting chips in the target backlight partition is determined based on the grayscale values ​​of all the color channels in the target backlight partition and the related backlight partition.

2. The display device according to claim 1, characterized in that, The step of adjusting the driving current of the light-emitting chip corresponding to each color channel in the target backlight partition according to the grayscale value of each color channel in the target backlight partition and the related backlight partition further includes: If the difference between the grayscale values ​​corresponding to the same color channel in the target backlight partition and the related backlight partition is not greater than the threshold, the driving current of the light-emitting chip corresponding to the same color channel in the target backlight partition is determined based on the grayscale values ​​of the same color channel in the target backlight partition and the related backlight partition.

3. The display device according to claim 1, characterized in that, Determining the driving current of at least a portion of the light-emitting chips in the target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition includes: When the target backlight partition includes a target color channel and a non-target color channel, the driving current of the light-emitting chip corresponding to the target color channel in the target backlight partition is determined based on the grayscale values ​​of all the color channels in the target backlight partition and the related backlight partition. The controller is also configured to determine the drive current of the light-emitting chip in the non-target color channel by means of: The driving current of the light-emitting chip corresponding to the same color channel in the target backlight partition is determined based on the grayscale value of the same color channel in the target backlight partition and the related backlight partition. Wherein, the target color channel is the color channel in the target backlight partition whose difference between the same color channel in the relevant backlight partition and the target backlight partition is greater than the threshold. The non-target color channel refers to the color channel in the target backlight partition that is not the target color channel.

4. The display device according to claim 2 or 3, characterized in that, The step of determining the driving current of the light-emitting chip corresponding to the same color channel in the target backlight partition based on the grayscale value of the same color channel in the target backlight partition and the related backlight partition includes: The first target grayscale value corresponding to the same color channel in the target backlight partition is determined based on the maximum single-channel grayscale value and the average single-channel grayscale value of the same color channel in the target backlight partition and the related backlight partition; The driving current of the light-emitting chip corresponding to the same color channel is determined based on the first target grayscale value; Wherein, the maximum single-channel grayscale value is the largest of the grayscale values ​​corresponding to the same color channel in the target backlight partition and the related backlight partition; The average single-channel grayscale value is the average of the grayscale values ​​corresponding to the same color channel in the target backlight partition and the related backlight partition.

5. The display device according to claim 4, characterized in that, The step of determining the first target grayscale value corresponding to the same color channel in the target backlight partition based on the maximum single-channel grayscale value and the average single-channel grayscale value of the same color channel in the target backlight partition and the related backlight partitions includes: The first target grayscale value corresponding to the same color channel is determined by the sum of the first product of the first weighting coefficient and the first product of the maximum single-channel grayscale value and the second product of the second weighting coefficient and the average single-channel grayscale value. Wherein, the sum of the first weighting coefficient and the second weighting coefficient is 1.

6. The display device according to claim 1, characterized in that, Determining the driving current of at least a portion of the light-emitting chips in the target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition includes: The driving current of each light-emitting chip in the target backlight partition is determined based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition.

7. The display device according to any one of claims 1, 3, and 6, characterized in that, Determining the driving current of the light-emitting chip in the target backlight partition based on the grayscale values ​​of all color channels in the target backlight partition and the related backlight partitions includes: The second target grayscale value of the light-emitting chip in the target backlight partition is determined based on the maximum full-channel grayscale value and the average full-channel grayscale value of all color channels in the target backlight partition and the related backlight partition; The driving current corresponding to the light-emitting chip is determined based on the second target grayscale value of the light-emitting chip; Wherein, the maximum full-channel grayscale value is the largest of the grayscale values ​​of all color channels in the target backlight partition and the related backlight partition; The average full-channel grayscale value is the average of the grayscale values ​​of all color channels in the target backlight zone and the related backlight zone.

8. The display device according to claim 7, characterized in that, The step of determining the second target grayscale value of each light-emitting chip in the target backlight partition based on the maximum and average full-channel grayscale values ​​of all color channels in the target backlight partition and the related backlight partitions includes: The second target grayscale value of each of the light-emitting chips is determined by the sum of the third product of the first weighting coefficient and the maximum full-channel grayscale value and the fourth product of the second weighting coefficient and the average full-channel grayscale value. Wherein, the sum of the first weighting coefficient and the second weighting coefficient is 1.

9. The display device according to claim 1, characterized in that, The display panel includes multiple pixels, and the controller is further configured to: The transmittance of each pixel in the display panel is adjusted according to the driving current of the light-emitting chip in each of the backlight zones, so that the display device can display the target image.

10. The display device according to claim 1, characterized in that, The controller is also configured to: The threshold is determined based on the grayscale value corresponding to each of the light-emitting chips when the backlight module displays white light.

11. The display device according to claim 10, characterized in that, The controller is also configured to: When the backlight partition displays white light, half of the grayscale value corresponding to each light-emitting chip is used as the threshold.

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