Display apparatus and control method of display apparatus

Abstract

Embodiments of the present application disclose a display device and a control method of the display device, and relate to the technical field of display. The display device comprises a backlight module, a liquid crystal panel and a backlight driving circuit. The backlight driving circuit determines target backlight data according to initial backlight data and preset reference data, converts the initial backlight data into the target backlight data with the first target color coordinate as the reference, reduces color deviation caused by the conversion, and in the case that the initial backlight data is backlight data corresponding to a white field picture or a gray field picture, the target backlight data obtained by the conversion can make at least one of a red light emitting source, a green light emitting source and a blue light emitting source emit light, thereby improving color deviation of a white light emitting source. In the case that the backlight is provided by using light emitting sources corresponding to red, green, blue and white respectively, the energy consumption of the display device is reduced, and the display effect of the display device is ensured.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display device and a method for controlling the display device. Background Technology

[0002] Display devices can be used to display images or video content. Among them, liquid crystal displays (LCDs) are widely used in daily life due to their low cost. An LCD device may include a liquid crystal panel, a backlight module, and a control module. The backlight module of an LCD device typically drives red, green, and blue light sources to emit light. By driving a combination of red, green, and blue light sources, the target display color is formed, thus providing backlight.

[0003] However, when displaying white-field images, the luminous efficiency of the backlight module is relatively low, resulting in high power consumption for the display device. Summary of the Invention

[0004] This application discloses a display device and a control method for the display device. The display device has low power consumption while ensuring the display effect.

[0005] This application provides a display device, including:

[0006] A backlight module is configured to emit backlight, the backlight module comprising N backlight zones, each of the backlight zones comprising at least a red light source, a green light source, a blue light source and a white light source, where N is an integer greater than or equal to 1;

[0007] The liquid crystal panel is configured to display an image in response to backlight emitted by the backlight module;

[0008] A backlight driving circuit is connected to the backlight module, and the backlight driving circuit is configured as follows:

[0009] Obtain the initial backlight data corresponding to the first backlight partition; the first backlight partition is any one of the N backlight partitions, and the initial backlight data includes the first component data corresponding to red, green and blue respectively;

[0010] Acquire preset component data, the preset component data including the reference component data corresponding to red, green, blue and white respectively when the display device displays a white field image and the color coordinates of the displayed white field image are the first target color coordinates;

[0011] Based on the initial backlight data and the preset component data, the target backlight data corresponding to the first backlight partition is determined. The target backlight data includes the second component data corresponding to red, green, blue and white respectively. The second component data is used by the backlight module to control the luminous state of the light source of the corresponding color.

[0012] Wherein, when the initial backlight data is the backlight data corresponding to a white field image or a gray field image, the target backlight data is used to drive the white light source in the first backlight partition to emit light, and to drive at least one of the red light source, green light source, and blue light source in the first backlight partition to emit light, so as to correct the color shift of the emitted light of the white light source.

[0013] In this embodiment, target backlight data is determined based on initial backlight data and preset reference data. This is achieved by introducing preset reference data calibrated when the display device shows a white-scale image with color coordinates matching the first target color coordinates. The target backlight data is then adjusted based on the initial backlight data. This process converts the initial backlight data to target backlight data using the first target color coordinates as a reference, reducing color shift caused by the conversion. Furthermore, this method is effective when the initial backlight data corresponds to a white-scale or gray-scale image, i.e., when the display device displays a white-scale or gray-scale image. If at least one of the second component data corresponding to the red, green, and blue light sources in the converted target backlight data is not zero, at least one of the red, green, and blue light sources can emit light. The emitted light from this light source is mixed with the emitted light from the white light source, thereby improving the color shift phenomenon of the white light source and further improving the display effect of the display device. By using red, green, blue, and white light sources to provide backlight, the energy consumption of the display device can be reduced while ensuring the display effect.

[0014] In some embodiments, the initial backlight data includes first backlight data and second backlight data, wherein the first backlight data and the second backlight data are backlight data corresponding to a white screen or a gray screen, and the screens corresponding to the first backlight data and the second backlight data are different.

[0015] The difference between the first brightness ratio corresponding to the white light source and at least one of the second brightness ratios corresponding to the red light source, green light source and blue light source is less than a preset threshold.

[0016] Wherein, the first brightness ratio is the ratio between the first brightness value and the second brightness value corresponding to the white light source, wherein the first brightness value is the brightness value of the white light source when the white light source is driven to emit light according to the second component data corresponding to white in the first target backlight data, and the first target backlight data is obtained based on the first backlight data; the second brightness value is the brightness value of the white light source when the white light source is driven to emit light according to the second component data corresponding to white in the second target backlight data, and the second target backlight data is obtained based on the second backlight data;

[0017] The second brightness ratio corresponding to the first color light source is the ratio between the third brightness value and the fourth brightness value corresponding to the first color light source. The third brightness value is the brightness value of the first color light source when the first color light source is driven to emit light according to the second component data corresponding to the first color in the first target backlight data. The fourth brightness value is the brightness value of the first color light source when the first color light source is driven to emit light according to the second component data corresponding to the first color in the second target backlight data. The first color is any one of red, green and blue.

[0018] In this embodiment, the initial backlight data includes first backlight data and second backlight data. The first backlight data and the second backlight data are backlight data corresponding to white field images or gray field images, and the images corresponding to the first backlight data and the second backlight data are different. That is, the display device displays different gray field images, or displays white field images and gray field images. The first brightness ratio of the white light source is close to the second brightness ratio of at least one of the light sources corresponding to red, green and blue, respectively. This ensures that the output ratio of red, green, blue and white light is relatively stable in the brightness adjustment scenario, thereby reducing color deviation and improving the display effect of the display device.

[0019] In some embodiments, determining the target backlight data corresponding to the first backlight partition based on the initial backlight data and the preset component data includes:

[0020] Based on the initial backlight data, the preset component data, and the first conversion data, the target backlight data corresponding to the first backlight partition is determined. The first conversion data includes conversion coefficients corresponding to red, green, and blue, respectively. The conversion coefficients are used to indicate the conversion relationship of the driving parameters from the color coordinates corresponding to the RGB light source to the color coordinates corresponding to the RGBW light source in the white field condition.

[0021] In this embodiment, the first conversion data includes conversion coefficients corresponding to red, green, and blue, respectively. The conversion coefficients are used to indicate the conversion relationship of the driving parameters from the color coordinates corresponding to the RGB light source to the color coordinates corresponding to the RGBW light source under white field conditions. Based on the initial backlight data, preset component data, and the first conversion data, that is, taking into account the white field conditions and the conversion relationship between the color coordinates of the RGB light source and the RGBW light source, the target backlight data is determined, which can reduce the color shift of the displayed pure color image and improve the display effect of the display device.

[0022] In some embodiments, determining the target backlight data corresponding to the first backlight partition based on the initial backlight data, the preset component data, and the first conversion data includes:

[0023] Based on the conversion coefficients and first component data corresponding to red, green, and blue respectively, the first weights corresponding to red, green, and blue are determined respectively;

[0024] The target weight is determined based on the first weights corresponding to red, green, and blue, respectively.

[0025] Based on the target weight and the baseline component data corresponding to white, determine the second component data corresponding to white;

[0026] Based on the target weight, the baseline component data corresponding to red, green, and blue respectively, the corresponding conversion coefficients, and the corresponding first component data, the second component data corresponding to red, green, and blue are determined respectively.

[0027] In this embodiment, the backlight driving circuit determines the first weights corresponding to red, green, and blue based on the conversion coefficients and first component data corresponding to red, green, and blue, respectively. Based on the first weights corresponding to red, green, and blue, a target weight is determined. Taking into account the brightness and conversion relationship of each color in the display screen, the weight of the component data corresponding to white is determined. This allows the second component data corresponding to white to be determined based on the target weight and the reference component data corresponding to white. Furthermore, the second component data corresponding to red, green, and blue can be determined based on the target weight, the reference component data corresponding to red, green, and blue, their respective conversion coefficients, and their respective first component data. This enables the reasonable allocation of each color component while satisfying the white field chromaticity constraint, thereby improving the luminous efficiency of the backlight module and reducing power consumption.

[0028] In some embodiments, determining the target weight based on the first weights corresponding to red, green, and blue respectively includes:

[0029] The minimum value among the first weights corresponding to red, green, and blue is determined as the target weight.

[0030] In this embodiment, the minimum value among the first weights corresponding to red, green, and blue is determined as the target weight. This avoids the introduction of excessive component data corresponding to white and the excessive compression of component data corresponding to red, green, and blue, thereby ensuring the color accuracy of the display screen.

[0031] In some embodiments, determining the second component data corresponding to the red, green, and blue colors based on the target weight, the baseline component data corresponding to the red, green, and blue colors respectively, the corresponding conversion coefficients, and the corresponding first component data respectively includes:

[0032] Based on the target weight and the reference component data corresponding to the first color, the luminance component corresponding to the first color is determined; the first color is any one of red, green, and blue.

[0033] The color shift component corresponding to the first color is determined based on the first component data corresponding to the first color and the product of the target weight and the conversion coefficient corresponding to the first color.

[0034] Based on the luminance component and color shift component corresponding to the first color, the second component data corresponding to the first color is determined.

[0035] In this embodiment, the backlight driving circuit determines the luminance component corresponding to the first color based on the target weight and the reference component data corresponding to the first color, and determines the color shift component corresponding to the first color based on the first component data corresponding to the first color and the product of the target weight and the conversion coefficient corresponding to the first color. This achieves linear adjustment of the reference component data of the first color to obtain the luminance component, and subtracts the luminance component from the first component data to obtain the color shift component. Finally, based on the luminance component and the color shift component corresponding to the first color, accurate second component data corresponding to the first color is obtained, ensuring the display effect of the display device.

[0036] In some embodiments, the conversion coefficient corresponding to the light source of the first color includes the ratio of the first current value to the second current value, and the first color is any one of red, green and blue;

[0037] The first current value is used to characterize the average current value of the light source of the first color when the display device displays a white field image and the color coordinates of the displayed white field image are the first target color coordinates, in the state where the white light source is off.

[0038] The second current value is used to characterize the average current value of the light source of the first color when the display device displays a first image of the first color and the color coordinates of the first image are the second target color coordinates, in the state where the white light source is off; wherein, the second target color coordinates are the color coordinates corresponding to the first image of the first color displayed by the display device when the component data corresponding to red, green, blue and white are the corresponding reference component data.

[0039] In this embodiment, when the white light source is off, and the display device displays a white screen image, and the color coordinates of the displayed white screen image are the first target color coordinates, the average current value of the first color light source is used as the first current value. This first current value represents the average driving current corresponding to the first color light source when white light is synthesized from red, green, and blue light sources and reaches the first target color coordinates. When the white light source is off, and the display device displays a first image of the first color, and the color coordinates of the displayed first image are the second target color coordinates, the average current value of the first color light source is used as the second current value. This second current value represents the average driving current corresponding to the first color light source when white light is synthesized from red, green, and blue light sources and reaches the second target color coordinates. The ratio of the first current value to the second current value indicates the conversion relationship of the driving parameters from the color coordinates corresponding to the RGB light source to the color coordinates corresponding to the RGBW light source in the white screen condition.

[0040] In some embodiments, the backlight driving circuit is further configured to:

[0041] When the display device is in the first color gamut mode, the white light source is controlled not to emit light, and the emitting states of the red light source, green light source and blue light source are controlled according to the first component data corresponding to red, green and blue respectively.

[0042] When the display device is in the second color gamut mode, the step of determining the target backlight data corresponding to the first backlight zone based on the initial backlight data and the preset component data is performed.

[0043] In this embodiment, the display device includes a first color gamut mode and a second color gamut mode. In the first color gamut mode, the white light source is turned off, so the color gamut corresponding to the first color gamut mode is relatively large. In the second color gamut mode, the light emission state of the white light source can be dynamically adjusted, thereby reducing the power consumption of the display device. The display device provides color gamut modes with different advantages, which improves the performance of the display device, meets the different needs of users, and enhances the user experience.

[0044] In some embodiments, the display device further includes an image processing module connected to the backlight driving circuit, the image processing module being configured to:

[0045] Generate initial backlight data based on the image data to be displayed;

[0046] The initial backlight data is transmitted to the backlight driving circuit.

[0047] In this embodiment, the image processing module generates initial backlight data based on the image data to be displayed and transmits the initial backlight data to the backlight driving circuit. Compared with the image processing module directly generating the target backlight data, this can reduce the transmission bandwidth between the image processing module and the backlight driving circuit.

[0048] This application provides a control method for a display device, applied to a display device including a backlight module and a liquid crystal panel. The backlight module is configured to emit backlight and includes N backlight zones, each of which includes at least a red light source, a green light source, a blue light source, and a white light source, where N is an integer greater than or equal to 1. The liquid crystal panel is configured to display an image based on the backlight emitted by the backlight module. The method includes:

[0049] Obtain the initial backlight data corresponding to the first backlight partition; the first backlight partition is any one of the N backlight partitions, and the initial backlight data includes the first component data corresponding to red, green and blue respectively;

[0050] Acquire preset component data, the preset component data including the reference component data corresponding to red, green, blue and white respectively when the display device displays a white field image and the color coordinates of the displayed white field image are the first target color coordinates;

[0051] Based on the initial backlight data and the preset component data, the target backlight data corresponding to the first backlight partition is determined. The target backlight data includes the second component data corresponding to red, green, blue and white respectively. The second component data is used by the backlight module to control the luminous state of the light source of the corresponding color.

[0052] Wherein, when the initial backlight data is the backlight data corresponding to a white field image or a gray field image, the target backlight data is used to drive the white light source in the first backlight partition to emit light, and to drive at least one of the red light source, green light source, and blue light source in the first backlight partition to emit light, so as to correct the color shift of the emitted light of the white light source. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the structure of a liquid crystal display device disclosed in an embodiment of this application;

[0055] Figure 2 This is a schematic diagram of the structure of a control module disclosed in an embodiment of this application;

[0056] Figure 3 This is a schematic diagram of another liquid crystal display device disclosed in the embodiments of this application;

[0057] Figure 4 This is a schematic diagram of the structure of a display device disclosed in an embodiment of this application;

[0058] Figure 5 This is a schematic diagram of the structure of another display device disclosed in an embodiment of this application;

[0059] Figure 6 This is a flowchart illustrating a control method for a display device disclosed in an embodiment of this application. Detailed Implementation

[0060] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0062] It should be noted that, in the following embodiments, when one element is "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediary element.

[0063] The display device provided in this application embodiment can be any product or component with display function, such as a television, mobile phone, tablet computer, monitor, laptop computer, digital photo frame, navigator, wearable device, Internet of Things device, etc.

[0064] Common display devices include liquid crystal displays (LCDs), organic light-emitting diode (OLED) displays, and quantum dot displays. Among these, LCDs are the most cost-effective and are widely used in the display industry.

[0065] Figure 1 This is a schematic diagram of the structure of a liquid crystal display device provided in an embodiment of this application. Figure 1 As shown, the liquid crystal display device may include a liquid crystal panel 110, a backlight module 120, and a control module 130. The backlight module 120 is located on the light-incident side of the liquid crystal panel 110. The backlight module 120 is configured to emit backlight, and the liquid crystal panel 110 is configured to display an image in response to receiving the backlight emitted by the backlight module 120.

[0066] For example, the liquid crystal panel 110 may include a liquid crystal layer, and the liquid crystal panel 110 is configured to provide an electric field. The liquid crystal molecules in the liquid crystal layer are deflected under the action of the electric field, thereby modulating the light passing through the liquid crystal panel 110. The backlight module 120 may include one or more light-emitting devices, and the backlight module 120 is configured to drive the light-emitting devices to light up in order to provide backlight to the liquid crystal panel 110. The control module 130 is connected to the LCD panel 110 and the backlight module 120 respectively. The control module 130 is configured to receive video input signals or image input signals, obtain image data from the video input signals or image input signals, perform format conversion, backlight data generation processing and pixel data generation processing on the image data, and output backlight data and pixel data. The backlight module 120 adjusts the current of the light-emitting device according to the backlight data, thereby adjusting the brightness of the light-emitting device. The LCD panel 110 adjusts the magnitude and direction of the provided electric field according to the pixel data to control the arrangement of liquid crystal molecules, thereby adjusting the degree of backlight transmission provided by the backlight module 120, so as to display the display screen corresponding to the video input signal or image input signal.

[0067] In some embodiments, the control module may include a SOC (System On Chip), which can be configured to obtain video input signals or image input signals (hereinafter referred to as input signals) from an external input port or a network port, and perform operations such as format conversion, data processing, and image rendering on the input signals.

[0068] In some embodiments, the control module may include a TCON (Timing Controller), which is configured to perform timing control output on the data it acquires.

[0069] In some embodiments, TCON is also configured to perform data format conversion, such as converting image data in YUV data format to pixel data in RGB data format.

[0070] Please refer to Figure 2 It shows a schematic diagram of the structure of a control module provided in an embodiment of this application, such as Figure 2 As shown, the TCON may include a data conversion module 210, a pixel statistics module 220, a filtering module 230, a backlight calculation module 240, and a pixel compensation module 250. The data conversion module 210 is configured to convert the color format of the first image data provided by the SOC to obtain RGB pixel data. The pixel statistics module 220 is configured to perform pixel statistics on the RGB pixel data to obtain the brightness information corresponding to the RGB pixel data. The filtering module 230 is configured to filter the brightness information to suppress noise or transient changes. The backlight calculation module 240 is configured to perform backlight calculation based on the filtered brightness information to obtain RGB backlight data. The pixel compensation module 250 is configured to compensate the RGB pixel data based on the RGB backlight data to obtain target RGB pixel data, which is used to provide the corresponding electric field magnitude and direction for the LCD panel. It can be understood that the RGB pixel data includes the pixel data corresponding to red, green, and blue. The RGB backlight data includes the component data corresponding to red, green, and blue.

[0071] Please continue to refer to this. Figure 2 In some embodiments, the control module may further include a central control board 260, which is configured to convert RGB backlight data into RGBW backlight data, and to distribute and process the RGBW backlight data to send it to the driver chip corresponding to the backlight module. It is understood that the RGBW backlight data includes component data corresponding to red, green, blue, and white.

[0072] In some embodiments, please refer to Figure 1 The liquid crystal display device may also include a power supply circuit 140, which is connected to the liquid crystal panel 110, the backlight module 120, and / or the control module 130, respectively. The power supply circuit 140 is configured to provide corresponding operating voltages to the liquid crystal panel 110, the backlight module 120, and / or the control module 130.

[0073] In some embodiments, the control module 130 is connected to the power supply circuit 140, and the control module 130 can output a power adjustment signal to the power supply circuit 140. The power adjustment signal may include a first power adjustment signal and a second power adjustment signal, wherein the first power adjustment signal is used to instruct the power supply circuit 140 to provide a corresponding operating voltage to the backlight module 120, and the second power adjustment signal is used to instruct the power supply circuit 140 to stop providing a corresponding operating voltage to the backlight module 120.

[0074] Figure 3 This is a schematic diagram of another liquid crystal display device provided in an embodiment of this application. The backlight module may include N backlight zones 310, which are connected in parallel. The backlight module may also include N driving units, which correspond one-to-one with the N backlight zones 310. The driving units are connected to the corresponding backlight zones 310 and are configured to control the light emission state of the light source 311 in the corresponding backlight zone.

[0075] Each backlight zone 310 may include at least four light-emitting sources 311, and each driving unit may include one or more driving chips 321. The four light-emitting sources 311 may be red, green, blue, and white light-emitting sources, respectively. The total number of driving terminals of the driving chips included in the driving unit should be greater than or equal to the total number of light-emitting sources 311 included in the corresponding backlight zone, so that each light-emitting source 311 can be driven by an independent driving terminal.

[0076] It is understood that the number of backlight partitions 310 and driving units included in the backlight module can be set according to actual needs, and this embodiment does not limit this. Figure 3 The backlight module is shown to include three driving units and three backlight zones 310. Each driving unit includes a driving chip 321, and each driving chip 321 includes a structure with four driving ends, namely the first driving end OUT1, the second driving end OUT2, the third driving end OUT3, and the fourth driving end OUT4.

[0077] Understandably, in order to improve the contrast and image depth of the display device, the backlight module in this embodiment adopts a local dimming control method. In local dimming control, the backlight module is divided into multiple independent light-emitting areas, called backlight zones 310, and different backlight zones 310 can be driven and controlled separately according to the local brightness requirements of the displayed image.

[0078] In this embodiment, a backlight zone 310 includes a red light source, a green light source, a blue light source, and a white light source. The driver chip 321 corresponding to the backlight zone 310 receives the backlight data corresponding to the backlight zone 310 and controls the light emission state of the light source 311 in the backlight zone 310 to achieve a more precise regional light control effect.

[0079] In some embodiments, the power supply circuit 140 may include a first power supply terminal and a second power supply terminal, the first power supply terminal being configured to provide a power supply voltage VCC, and the second power supply terminal being configured to provide a backlight power supply voltage VLED. Each driving unit is connected to the first power supply terminal, and each backlight zone 310 is connected to the second power supply terminal.

[0080] In some embodiments, the control module 130 is connected to each drive unit, and the control module 130 can send backlight data to the drive unit.

[0081] It is understood that the number of driver chips 321 included in the driving unit can be set according to actual needs, and this embodiment does not limit this. The number of driver chips 321 included in each driving unit can be the same or different, and the number of light sources included in each backlight zone can be the same or different.

[0082] In some embodiments, the first driving chip includes four driving terminals, and the first backlight zone corresponding to the first driving chip includes four light-emitting sources 311. Each of the four light-emitting sources 311 corresponds one-to-one with one of the four driving terminals. The negative terminal of each light-emitting source 311 is connected to the corresponding driving terminal in the first driving chip, and the positive terminal of each light-emitting source 311 is connected to the second power supply terminal of the power supply circuit 140, forming a power supply path corresponding to that light-emitting source 311. The driving chip 321 can be configured to adjust the current of the power supply path corresponding to each light-emitting source 311 connected to each driving terminal according to the backlight data received from the first data terminal DIN.

[0083] Understandably, the number of driving terminals included in each driving chip 321 may be the same or different. The driving terminal of the first driving chip is connected to the negative terminal of the corresponding light source 311. The first driving chip can drive K light sources 311 to emit light simultaneously, or it can drive some of the K light sources 311 to light up.

[0084] In some embodiments, the driver chip 321 includes a first data terminal DIN and a second data terminal DON. The first data terminal DIN of the first driver chip of the first driver unit is connected to the control module 130, and the second data terminal DON of the driver chip 321 of the first driver unit is connected to the first data terminal DIN of the next driver chip 321. This allows each driver chip to receive the backlight data output by the control module, thereby enabling the light emission state of the light source 311 in the corresponding backlight partition 310 to be controlled based on the backlight data corresponding to the corresponding backlight partition 310.

[0085] In some embodiments, the light source 311 may include at least one light-emitting device of a corresponding color, and the light-emitting devices of the light source 311 are connected in series.

[0086] In other embodiments, the light source 311 includes at least one light-emitting device of a corresponding color, and the light-emitting devices of the light source 311 are connected in parallel.

[0087] In other embodiments, the light source 311 includes multiple light strings connected in parallel, each light string including at least one light-emitting device, and if the light string includes multiple light-emitting devices, the multiple light-emitting devices are connected in series.

[0088] The light-emitting device can be one of the following: Mini LED (Mini Light Emitting Diode), Micro LED (Micro Light Emitting Diode), W LED (White Light-Emitting Diode), RGB LED (Red Green Blue Light-Emitting Diode), GB-rLED (Green Blue-red Light-Emitting Diode), or Q LED (Quantum Dot Light Emitting Diode).

[0089] In some embodiments, the driver chip 321 further includes a third power supply terminal V1, and the third power supply terminal V1 of each driver chip 321 in the driver module is connected to the first power supply terminal of the power supply circuit 140.

[0090] Understandably, the brightness of the backlight zone 310 is determined by the average current flowing through its power supply path, i.e., the average current passing through the backlight zone 310. The current (instantaneous current) and conduction duration of the power supply path of the backlight zone 310 determine its average current. Therefore, the driver chip 321 controls the current and conduction duration of the power supply path of the corresponding light source 311 based on the backlight data output by the control module 130, enabling different light sources 311 to achieve the desired brightness, thereby ensuring the brightness of the backlight zone 310 is the desired level. Different wavelengths of emitted light can mix in space to form composite light of various colors. By adjusting the brightness of each backlight zone 310 separately, dynamic control of the brightness and overall color temperature of the composite light of the backlight template can be achieved, thus meeting different display requirements.

[0091] In related technologies, display devices typically use RGB backlight modules to provide backlight. The researchers of this application have discovered that because red and green light-emitting devices (such as LEDs) have low luminous efficiency, the luminous efficiency of the backlight module is low when the display device displays a white field image, resulting in high power consumption of the backlight module and high power consumption of the display device.

[0092] The researchers of this application considered using an RGBW backlight module to provide backlight, thereby improving the luminous efficiency of the backlight module by adding a white light-emitting device with high luminous efficiency. However, the white light-emitting device and the RGB three-color light-emitting device have different spectral compositions. Directly decomposing the component data corresponding to RGB into the component data corresponding to RGBW will cause the color coordinates corresponding to the white field and the gray field to deviate when displaying white field and gray field images through the RGBW backlight module (the color coordinates are different from those corresponding to the white field and gray field images when displaying white field and gray field images through the RGB backlight module), resulting in poor display effect of the display device.

[0093] For example, when the RGB backlight data corresponds to the backlight data of a white or gray screen, only the white light source is lit, while the red, green, and blue light sources are kept off. Due to the preparation and light emission principle of the white light source, the color coordinates corresponding to the white light source cannot be adjusted to the first target color coordinates (the color coordinates required to display a white screen) of the RGB light source. This causes the color coordinates of the displayed white and gray screens to deviate when the white and gray screens are displayed through the RGBW backlight module. In other words, a color shift phenomenon occurs when the color coordinates of the displayed white and gray screens are displayed through the RGB backlight module.

[0094] This application provides a display device and a control method for the display device. The display device has low power consumption while ensuring the display effect.

[0095] Figure 4 A schematic diagram of the structure of a display device provided in an embodiment of this application is shown. Figure 4 As shown, the display device may include a backlight module 410 and a liquid crystal panel (LCD). Figure 4 (Not shown in the image) and a backlight driving circuit 420, which is connected to the backlight module 410. The backlight module 410 is configured to emit backlight and includes N backlight zones 411. Each backlight zone 411 includes at least a red light source, a green light source, a blue light source, and a white light source. The LCD panel is configured to display an image based on the backlight emitted by the backlight module 410. The backlight driving circuit 420 is configured to acquire initial backlight data corresponding to the first backlight zone, acquire preset component data, and determine target backlight data corresponding to the first backlight zone based on the initial backlight data and the preset component data.

[0096] Wherein, N is an integer greater than or equal to 1, the first backlight partition is any one of the N backlight partitions 411, the initial backlight data includes the first component data corresponding to red, green and blue respectively, the preset component data includes the reference component data corresponding to red, green, blue and white respectively when the display device displays a white field image and the color coordinates of the displayed white field image are the first target color coordinates, and the target backlight data includes the second component data corresponding to red, green, blue and white respectively, and the second component data is used by the backlight module 410 to control the light emission state of the light source of the corresponding color.

[0097] When the initial backlight data is the backlight data corresponding to a white field image or a gray field image, the target backlight data is used by the backlight module 410 to drive the white light source in the first backlight zone to emit light, and to drive at least one of the red light source, green light source, and blue light source in the first backlight zone to emit light, so as to correct the color shift of the emitted light from the white light source.

[0098] It should be noted that when the display device is displaying a white screen, the pixel data corresponding to red, green, and blue in the RGB pixel data are the maximum pixel data. Taking a maximum pixel value of 255 as an example, when the display device is displaying a white screen, the RGB pixel data is (255, 255, 255). When the display device is displaying a gray screen, the pixel data corresponding to red, green, and blue in the RGB pixel data are equal and less than the maximum pixel data. For example, when the display device is displaying a gray screen, the RGB pixel data could be (150, 150, 150), (180, 180, 180), etc. It is understandable that the initial backlight data is related to the display screen; that is, the initial backlight data will be different depending on the display screen. When the initial backlight data is the backlight data corresponding to a white field image or a gray field image, that is, when a white field image or a gray field image needs to be displayed, the backlight module 410 drives the white light source to emit light while driving at least one of the red light source, green light source, and blue light source to emit light, so that the emitted light of at least one of the red light source, green light source, and blue light source mixes with the emitted light of the white light source, so as to correct the color deviation of the emitted light of the white light source and improve the color accuracy of the display device in displaying white field images and gray field images.

[0099] It should be noted that component data can be used to characterize the brightness of a light source of a corresponding color, and component data can be used to control the average current of a light source of a corresponding color. For example, the driving terminal of the driver chip is connected to the cathode of the light source, and the anode of the light source is connected to the power supply circuit. The driver chip adjusts the duty cycle of the driving signal according to the component data corresponding to the color of the light source in the target backlight data, thereby making the average current corresponding to the light source consistent with the average current corresponding to the component data. It can be understood that the power supply circuit, the light source, and the driver chip form the power supply path for the light source, and the average current of this power supply path is the average current corresponding to the light source.

[0100] It should be noted that the light emission state of a light source may include its operating state and / or its brightness. The operating state may include emitting light or not emitting light. The light emission state of the light source can be controlled by adjusting the average current of the power supply path corresponding to the light source.

[0101] It should be noted that the reference component data refers to the component data corresponding to the color when the display device displays a white screen and the color coordinates of the displayed white screen are the first target color coordinates. Taking the maximum pixel value of red, green, and blue as 255 as an example, when the RGB pixel data is (255, 255, 255), that is, when the LCD panel is driven according to (255, 255, 255), it can be considered that the display device is displaying a white screen. The first target color coordinates can be set according to actual needs, or determined according to the color coordinates of the display screen corresponding to the RGB light source (white light source off). It can be understood that when the component data corresponding to red, green, blue, and white are the corresponding reference component data, and the display device displays a white screen, the color coordinates of the displayed white screen are the first target color coordinates.

[0102] For example, the display device may include a memory. Reference component data can be obtained through testing and stored in the memory. The memory may include ROM (Read-Only Memory), flash memory, etc.

[0103] In some embodiments, when the display device displays a white field image, the white light source is turned off, and the current of the red, green, and blue light sources is adjusted until the chromaticity of the white field image reaches the target chromaticity. The current brightness value and the first current value Ir1 corresponding to the red light source, the first current value Ig1 corresponding to the green light source, and the first current value Ib1 corresponding to the blue light source are recorded. The display device is kept displaying a white field image, and the white light source is turned on. The current value of the white light source is adjusted until the brightness of the displayed white field image matches the recorded brightness value. Then, the average current values ​​of the red, green, and blue light sources are adjusted until the chromaticity of the displayed white field image reaches the target chromaticity again. The current component data corresponding to red, green, blue, and white are used as the reference component data corresponding to red, green, blue, and white, respectively.

[0104] It should be noted that the target chromaticity can be selected according to actual needs, and this embodiment does not limit it. In this embodiment, with the white light source turned off, the chromaticity of the white field image is first determined to be the brightness value corresponding to the target chromaticity. Then, with the white light source turned on, the reference component data corresponding to the red, green, blue, and white values ​​corresponding to the brightness value and the target chromaticity are determined respectively. This can improve the display effect of the white field image displayed by the display device when the RGB backlight data is converted into RGBW backlight data and the backlight module 410 is lit by driving the RGBW backlight data.

[0105] Meanwhile, by first adjusting the current value of the white light source until it approaches the recorded brightness value, the brightness represented by the reference component data corresponding to the white light source can be maximized. Since the white light source has high luminous efficiency, determining the target backlight data for driving the backlight module 410 based on the preset component data and the initial backlight data can also maximize the proportion of emitted light from the white light source, improve the luminous efficiency of the backlight module 410, and reduce the power consumption of the display device.

[0106] It should be noted that since the color spectrum of the light source composed of white light source and the light sources corresponding to red, green and blue light sources are different, at least one of the reference component data corresponding to red, green and blue is not 0. Therefore, when displaying white field or gray field images, the emitted light of white light source can be mixed with the emitted light of at least one of the light sources corresponding to red, green and blue light sources, thereby reducing the color deviation of the display.

[0107] In this embodiment, when the display device displays a white field image and the color coordinates of the displayed white field image are the first target color coordinates, the reference component data corresponding to red, green, blue and white are obtained respectively. The reference component data corresponding to red, green, blue and white are adjusted according to the initial backlight data to obtain the second component data corresponding to red, green, blue and white respectively. Based on the white balance, the second component data corresponding to red, green, blue and white can be obtained respectively, reducing the color deviation of the display device.

[0108] For example, the backlight driving circuit 420 sends the target backlight data corresponding to the first backlight partition to the backlight module 410. The backlight module 410 controls the illumination state of the red light source in the first backlight partition according to the second component data corresponding to red in the target backlight data; controls the illumination state of the green light source in the first backlight partition according to the second component data corresponding to green in the target backlight data; controls the illumination state of the blue light source in the first backlight partition according to the second component data corresponding to blue in the target backlight data; and controls the illumination state of the white light source in the first backlight partition according to the second component data corresponding to white in the target backlight data. It can be understood that the backlight driving circuit 420 obtains the target backlight data corresponding to each backlight partition 411 based on the preset component data and the initial backlight data corresponding to each backlight partition 411 included in the backlight module 410. The backlight module 410 controls the illumination state of the light source in the corresponding backlight partition 411 according to the target backlight data corresponding to each backlight partition 411.

[0109] It should be noted that when the initial backlight data is the backlight data corresponding to a white field image or a gray field image, that is, when the display device displays a gray field image or a white field image, in this embodiment, when the initial backlight data is the backlight data corresponding to a white field image or a gray field image, the target backlight data obtained by converting the initial backlight data can not only drive the white light source to light up, but also drive at least one of the red, green and blue light sources to light up. The emitted light of the light source is mixed with the emitted light of the white light source, thereby improving the color shift of the emitted light of the white light source and further improving the display effect of the display device.

[0110] In this embodiment, target backlight data is determined based on initial backlight data and preset reference data. This is achieved by introducing preset reference data calibrated when the display device shows a white-scale image with color coordinates matching the first target color coordinates. The target backlight data is then adjusted based on the initial backlight data. This process converts the initial backlight data to target backlight data using the first target color coordinates as a reference, reducing color shift caused by the conversion. Furthermore, this method is effective when the initial backlight data corresponds to a white-scale or gray-scale image, i.e., when the display device displays a white-scale or gray-scale image. If at least one of the second component data corresponding to the red, green, and blue light sources in the converted target backlight data is not zero, at least one of the red, green, and blue light sources can emit light. The emitted light from this light source is mixed with the emitted light from the white light source, thereby improving the color shift phenomenon of the white light source and further improving the display effect of the display device. By using red, green, blue, and white light sources to provide backlight, the energy consumption of the display device can be reduced while ensuring the display effect.

[0111] In some embodiments, the initial backlight data may include first backlight data and second backlight data, wherein the first backlight data and the second backlight data are backlight data corresponding to a white field image or a gray field image, and the images corresponding to the first backlight data and the second backlight data are different. The difference between the first brightness ratio corresponding to the white light source and at least one of the second brightness ratios corresponding to the red light source, the green light source, and the blue light source is less than a preset threshold.

[0112] Wherein, the first brightness ratio is the ratio between the first brightness value and the second brightness value corresponding to the white light source. The first brightness value is the brightness value of the white light source when it is driven to emit light according to the second component data corresponding to white in the first target backlight data. The second brightness value is the brightness value of the white light source when it is driven to emit light according to the second component data corresponding to white in the second target backlight data. The second brightness ratio corresponding to the first color light source is the ratio between the third brightness value and the fourth brightness value corresponding to the first color light source. The third brightness value is the brightness value of the first color light source when it is driven to emit light according to the second component data corresponding to the first color in the first target backlight data. The fourth brightness value is the brightness value of the first color light source when it is driven to emit light according to the second component data corresponding to the first color in the second target backlight data.

[0113] The first color is any one of red, green, and blue. It should be noted that when the display device displays different grayscale images, or displays both grayscale and whitescale images, the brightness ratio of the white light source is close to the brightness ratio of at least one of red, green, and blue. It should also be noted that when the display device displays different grayscale images (including the full grayscale range from black to white and pure white images), the brightness adjustment ratio of the white light source is close to the brightness adjustment ratio of at least one of the corresponding red, green, and blue light sources, ensuring that the chromaticity of the mixed light remains stable from low grayscale to high grayscale, involving only brightness adjustment, thereby reducing color shift in the displayed grayscale image.

[0114] The first target backlight data is obtained based on the first backlight data, that is, the backlight driving circuit determines the first target backlight data corresponding to the first backlight partition based on the first backlight data and preset component data. The second target backlight data is obtained based on the second backlight data, that is, the backlight driving circuit determines the second target backlight data corresponding to the first backlight partition based on the second backlight data and preset component data.

[0115] It should be noted that the difference between the first backlight data and the second backlight data can be understood as follows: the first backlight data is generated based on the first RGB pixel data, and the second backlight data is generated based on the second RGB pixel data; therefore, the first RGB pixel data and the second RGB pixel data are different. Specifically, the red, green, and blue pixels in the first RGB pixel data are the same, and the red, green, and blue pixels in the second RGB pixel data are also the same.

[0116] For example, the first backlight data corresponds to a first grayscale image, and the second backlight data corresponds to a second grayscale image. In another example, the first backlight data corresponds to a whitescale image, and the second backlight data corresponds to a third grayscale image. The first grayscale image is different from the second grayscale image, and the third grayscale image can be the same as or completely different from either the first or second grayscale image.

[0117] In some embodiments, the first luminance ratio may be a first luminance value divided by a second luminance value, and the second luminance ratio may be a third luminance value divided by a fourth luminance value. In other embodiments, the first luminance ratio may be a second luminance value divided by a first luminance value, and the second luminance ratio may be a fourth luminance value divided by a third luminance value.

[0118] For example, the preset threshold value may range from 1% to 10%. Optionally, the preset threshold may be 1%, 5%, or 10%.

[0119] In this embodiment, the initial backlight data includes first backlight data and second backlight data. The first backlight data and the second backlight data are backlight data corresponding to white field images or gray field images, and the images corresponding to the first backlight data and the second backlight data are different. That is, the display device displays different gray field images, or displays white field images and gray field images. The first brightness ratio of the white light source is close to the second brightness ratio of at least one of the light sources corresponding to red, green and blue, respectively. This ensures that the output ratio of red, green, blue and white light is relatively stable in the brightness adjustment scenario, thereby reducing color deviation and improving the display effect of the display device.

[0120] In some embodiments, determining target backlight data based on initial backlight data and preset component data may include determining target backlight data based on initial backlight data, preset component data, and first conversion data.

[0121] The first conversion data includes conversion coefficients for red, green, and blue, respectively. These conversion coefficients indicate the conversion relationship of the driving parameters from the color coordinates corresponding to the RGB light source to the color coordinates corresponding to the RGBW light source under white field conditions. It should be noted that white field conditions refer to a display device showing a white field image. Driving parameters may include the average current value of the power supply circuit corresponding to the light source, the duty cycle of the driving signal corresponding to each color, and the component data corresponding to each color. The color coordinates corresponding to the RGB light source may include the red, blue, and green color coordinates when the white light source is off, and the color coordinates corresponding to the RGBW light source may include the red, blue, and green color coordinates when the white light source is on.

[0122] It should be noted that the conversion coefficient is used to indicate the conversion relationship of the driving parameters from the color coordinates corresponding to the RGB light source to the color coordinates corresponding to the RGBW light source under white field conditions. Since the initial backlight data corresponds to the RGB light source and the preset component data is related to the RGBW light source under white field conditions, the target backlight data is determined based on the conversion coefficient, the initial backlight data, and the preset component data. In the process of converting RGB backlight data to RGBW backlight data, the white field conditions and color coordinate conditions can be comprehensively considered to improve the accuracy of the obtained target backlight data and reduce the color deviation of the display device.

[0123] In this embodiment, the first conversion data includes conversion coefficients corresponding to red, green, and blue, respectively. The conversion coefficients are used to indicate the conversion relationship of the driving parameters from the color coordinates corresponding to the RGB light source to the color coordinates corresponding to the RGBW light source under white field conditions. Based on the initial backlight data, preset component data, and the first conversion data, that is, taking into account the white field conditions and the conversion relationship between the color coordinates of the RGB light source and the RGBW light source, the target backlight data is determined, which can reduce the color shift of the displayed pure color image and improve the display effect of the display device.

[0124] In some embodiments, the conversion coefficient corresponding to the light source of the first color includes the ratio of a first current value to a second current value, where the first color is any one of red, green, and blue. The first current value characterizes the average current value of the light source of the first color when the display device displays a white field image with the white light source off, and the color coordinates of the displayed white field image are the first target color coordinates. The second current value characterizes the average current value of the light source of the first color when the display device displays a first image of the first color with the white light source off, and the color coordinates of the displayed first image are the second target color coordinates. The second target color coordinates are the component data corresponding to red, green, blue, and white, respectively, which are the corresponding reference component data, and the color coordinates corresponding to the first image of the first color displayed by the display device when the display device displays the first image of the first color.

[0125] It should be noted that the average current value of the light source of the first color refers to the average current value of the power supply path corresponding to the light source of the first color. When the display device displays the first image of the first color, the liquid crystal molecules corresponding to the second color in the liquid crystal panel are turned off, and the second color is a color different from the first color among red, green, and blue.

[0126] In some embodiments, the second current value is acquired when the display device is in a first state, where the white light source is off, the component data corresponding to the second color light source is the reference component data corresponding to the second color light source, and the display device displays a first image of the first color. The second color is any color other than the first color and color W. It should be noted that when the display device displays the first image of the first color, the component data corresponding to the second color light source is maintained as the reference component data, and then the current value of the first color light source is adjusted to ensure that only the brightness of the first color light source changes. This avoids color coordinate changes caused by changes in the component data corresponding to the second color light source, ensuring the accuracy of the obtained second current value.

[0127] For example, the ratio of the first current value to the second current value may refer to the second current value divided by the first current value.

[0128] In this embodiment, when the white light source is off, and the display device displays a white screen image, and the color coordinates of the displayed white screen image are the first target color coordinates, the average current value of the first color light source is used as the first current value. This first current value represents the average driving current corresponding to the first color light source when white light is synthesized from red, green, and blue light sources and reaches the first target color coordinates. When the white light source is off, and the display device displays a first image of the first color, and the color coordinates of the displayed first image are the second target color coordinates, the average current value of the first color light source is used as the second current value. This second current value represents the average driving current corresponding to the first color light source when white light is synthesized from red, green, and blue light sources and reaches the second target color coordinates. The ratio of the first current value to the second current value indicates the conversion relationship of the driving parameters from the color coordinates corresponding to the RGB light source to the color coordinates corresponding to the RGBW light source in the white screen condition.

[0129] In some embodiments, when the component data corresponding to red, green, blue, and white are used as reference component data, the display screen of the display device is adjusted to a red screen, and the color coordinates of the displayed red screen are tested and recorded as (xr, yr). At this time, the white light source is turned off, while keeping the component data of the green and blue light sources unchanged, and the component data corresponding to the red light source is reduced to make the color coordinates of the displayed red screen as close as possible to (xr, yr). The average current value corresponding to the red light source is recorded, which is the second current value Ir2 corresponding to red, and the conversion coefficient i corresponding to red is i = Ir2 / Ir1.

[0130] With the component data corresponding to red, green, blue, and white as the reference component data, the display screen of the display device is adjusted to a green screen, and the color coordinates of the displayed green screen are tested and recorded as (xg, yg). At this time, the white light source is turned off, and the component data corresponding to the red and blue light sources are kept unchanged. The component data corresponding to the green light source is reduced so that the color coordinates of the displayed green screen are closest to (xg, yg). The average current value corresponding to the green light source is recorded, which is the second current value Ig2 corresponding to green. The conversion coefficient m corresponding to green is Ig2 / Ig1.

[0131] With the component data corresponding to red, green, blue, and white as the reference component data, the display screen of the display device is adjusted to the blue screen, and the color coordinates of the displayed blue screen are tested and recorded as (xb, yb). At this time, the white light source is turned off, and the component data corresponding to the red and green light sources are kept unchanged. The component data corresponding to the blue light source is reduced so that the color coordinates of the displayed blue screen are closest to (xb, yb). The average current value corresponding to the blue light source is recorded, which is the second current value Ib2 corresponding to blue. The conversion coefficient n corresponding to blue is n = Ib2 / Ib1.

[0132] In some embodiments, the conversion coefficient corresponding to the light source of the first color includes the ratio of a first conversion component to a second conversion component. The first conversion component characterizes the component data corresponding to the first color when the display device displays a white field image with the white light source off, and the color coordinates of the displayed white field image are the first target color coordinates. The second conversion component characterizes the component data corresponding to the first color when the display device displays a first image of the first color with the white light source off, and the color coordinates of the displayed first image are the second target color coordinates.

[0133] In some embodiments, the controller is further configured to determine first weights corresponding to red, green, and blue based on the conversion coefficients and corresponding first component data for red, green, and blue, respectively; determine a target weight based on the first weights corresponding to red, green, and blue, respectively; and determine second component data corresponding to the white light source based on the target weight and the reference component data corresponding to white.

[0134] Based on the target weight, the baseline component data corresponding to red, green, and blue respectively, the conversion coefficients corresponding to red, green, and blue respectively, and the first component data corresponding to red, green, and blue respectively, the second component data corresponding to red, green, and blue respectively are determined.

[0135] It should be noted that, based on the conversion coefficients and corresponding first component data of red, green, and blue, respectively, the first weights corresponding to red, green, and blue are generated, and then the target weights are determined. This process takes into account the brightness and color coordinate conversion characteristics of each color, determines the proportion of white light source to be introduced, and introduces the component data corresponding to white light under the constraints of the brightness and conversion characteristics of red, green, and blue, ensuring the accuracy of the second component data corresponding to white light, while also ensuring the rationality of the second component data corresponding to red, green, and blue.

[0136] It should be noted that the backlight module can determine the second component data corresponding to red based on the target weight, the reference component data corresponding to red, the conversion coefficient corresponding to red, and the first component data corresponding to red. Similarly, the second component data corresponding to green and the second component data corresponding to blue can be obtained.

[0137] In some embodiments, determining the first weights corresponding to red, green, and blue based on the conversion coefficients corresponding to red, green, and blue, and the first component data corresponding to each, may include calculating the ratio between the first component data corresponding to red and the conversion coefficient corresponding to red to obtain the first weight corresponding to red; calculating the ratio between the first component data corresponding to green and the conversion coefficient corresponding to green to obtain the first weight corresponding to green; and calculating the ratio between the first component data corresponding to blue and the conversion coefficient corresponding to blue to obtain the first weight corresponding to blue.

[0138] It should be noted that the ratio between the first component data corresponding to red and the conversion coefficient corresponding to red is used as the first weight for red. This first weight reflects the maximum proportion that can be extracted from the first component data corresponding to red. Similarly, the same applies to green and blue. Using this maximum proportion as the first weight for each color avoids allocating too much space to the white light source, thus ensuring the display effect of the display device.

[0139] In other embodiments, determining the first weights corresponding to red, green, and blue based on the conversion coefficients and the first component data corresponding to red, green, and blue may include: normalizing the first component data corresponding to red, green, and blue to obtain the third component data corresponding to red, green, and blue, and determining the first weights corresponding to red, green, and blue based on the conversion coefficients and the third component data corresponding to red, green, and blue.

[0140] In this embodiment, the first component data corresponding to red, green and blue are first normalized to obtain the third component data corresponding to red, green and blue respectively. Then, the first weight is determined according to the corresponding third component data and the conversion coefficient. This can eliminate the influence of the difference in the value range of the component data corresponding to different colors on the calculated first weight, so that the determined first weights corresponding to different colors are comparable and consistent.

[0141] In some embodiments, determining the first weights corresponding to red, green, and blue based on the conversion coefficients corresponding to red, green, and blue, and the corresponding third component data, may include calculating the ratio between the third component data corresponding to red and the conversion coefficient corresponding to red to obtain the first weight corresponding to red; calculating the ratio between the third component data corresponding to green and the conversion coefficient corresponding to green to obtain the first weight corresponding to green; and calculating the ratio between the third component data corresponding to blue and the conversion coefficient corresponding to blue to obtain the first weight corresponding to blue.

[0142] For example, the calculation formula for the first weight α1 corresponding to red can be referred to formula (1), the calculation formula for the first weight α2 corresponding to green can be referred to formula (2), and the calculation formula for the first weight α3 corresponding to blue can be referred to formula (3).

[0143] (1);

[0144] (2);

[0145] (3);

[0146] Where i is the conversion coefficient corresponding to red, m is the conversion coefficient corresponding to green, and n is the conversion coefficient corresponding to blue. R represents the third component data corresponding to red, R1 represents the first component data corresponding to red, and Rmax represents the maximum component data corresponding to red. G represents the third component data corresponding to green, G1 represents the first component data corresponding to green, and Gmax represents the largest component data corresponding to green. , b is the third component data corresponding to blue, B1 is the first component data corresponding to blue, and Bmax is the largest component data corresponding to blue.

[0147] In some embodiments, determining the target weight based on the first weights corresponding to red, green, and blue can include determining the median of the first weights corresponding to red, green, and blue as the target weight. In this embodiment, determining the median of the first weights corresponding to red, green, and blue as the target weight can result in a larger component data corresponding to white, thereby improving the luminous efficiency of the backlight module.

[0148] In other embodiments, the target weight is determined based on the first weights corresponding to red, green, and blue, respectively. This may include determining the minimum value among the first weights corresponding to red, green, and blue as the target weight. It should be noted that the first weight reflects the maximum proportion that can be extracted from the first component data of the corresponding color. By selecting the minimum value among the first weights corresponding to red, green, and blue as the target weight, excessive introduction of white component data or excessive compression of RGB component data can be avoided, thus preventing color shift.

[0149] In this embodiment, the minimum value among the first weights corresponding to red, green, and blue is determined as the target weight. This avoids the introduction of excessive component data corresponding to white and the excessive compression of component data corresponding to red, green, and blue, thereby ensuring the color accuracy of the display screen.

[0150] In some embodiments, determining the second component data corresponding to white based on the target weight and the reference component data corresponding to white may include calculating the product of the target weight and the reference component data corresponding to white to obtain the second component data corresponding to the white light source. In this embodiment, linear control of brightness can be achieved, ensuring the flexibility and accuracy of the obtained brightness component corresponding to white.

[0151] In some embodiments, determining the second component data corresponding to red, green, and blue based on the target weight, the reference component data corresponding to red, green, and blue respectively, the conversion coefficients corresponding to red, green, and blue respectively, and the first component data corresponding to red, green, and blue respectively may include determining the luminance component corresponding to the first color based on the target weight and the reference component data corresponding to the first color, determining the color shift component corresponding to the first color based on the first component data corresponding to the first color and the product of the target weight and the conversion coefficient corresponding to the first color, and determining the second component data corresponding to the first color based on the luminance component corresponding to the first color and the color shift component corresponding to the first color.

[0152] The first color can be any one of red, green, and blue. It should be noted that color parameters may include chromaticity and luminance. Since chromaticity and luminance have different characteristics, the accuracy of the second component data can be ensured by calculating the color shift component and luminance component separately.

[0153] In some embodiments, determining the luminance component corresponding to the first color based on the target weight and the reference component data corresponding to the first color may include calculating the product between the target weight and the reference component data corresponding to the light source of the first color to obtain the luminance component corresponding to the first color. It should be noted that by multiplying the target weight by the reference component data corresponding to the first color, linear control of the luminance can be achieved, ensuring the flexibility and accuracy of the obtained luminance component.

[0154] In some embodiments, determining the color bias component corresponding to the first color based on the first component data corresponding to the first color and the product of the target weight and the conversion coefficient corresponding to the first color may include calculating the difference between the first component data corresponding to the first color and the first product to obtain the color bias component corresponding to the first color, wherein the first product is the product of the target weight and the conversion coefficient corresponding to the first color.

[0155] It should be noted that since the light source of the first color provides both brightness and chromaticity, by calculating the difference between the first component data corresponding to the first color and the first product, the influence of the brightness part on the color deviation part can be reduced, thereby ensuring the accuracy of the obtained color deviation component.

[0156] In some embodiments, determining the second component data corresponding to the first color based on the luminance component and the color shift component corresponding to the first color may include calculating the sum of the luminance component and the color shift component corresponding to the first color to obtain the second component data corresponding to the first color.

[0157] It should be noted that the color shift component and the luminance component are independent of each other. By calculating the luminance component and the color shift component corresponding to the first color, the second component data corresponding to the light source of the first color can be determined, which can ensure the rationality and completeness of the obtained second component data.

[0158] For example, the second component data corresponding to the red light source. The calculation formula can be found in equation (4), and the second component data corresponding to the green light source. The calculation formula can be found in equation (5), and the second component data corresponding to the blue light source. The calculation formula can be found in formula (6).

[0159] (4);

[0160] Where α is the target weight, denoted as the baseline component data corresponding to red, r is the normalized third component data corresponding to red, i is the transformation coefficient corresponding to red, and Rmax is the maximum component data corresponding to red.

[0161] (5);

[0162] Where α is the target weight, denoted as the baseline component data corresponding to green, g is the normalized third component data corresponding to green, m is the conversion coefficient corresponding to green, and Gmax is the maximum component data corresponding to green.

[0163] (6);

[0164] Where α is the target weight, denoted as the baseline component data corresponding to blue, b is the normalized third component data corresponding to blue, n is the transformation coefficient corresponding to blue, and Bmax is the maximum component data corresponding to blue.

[0165] For example, the second component data corresponding to a white light source. The calculation formula can be found in formula (7).

[0166] (7)

[0167] Where α is the target weight, This is the baseline component data corresponding to white.

[0168] In this embodiment, the backlight driving circuit determines the luminance component corresponding to the first color based on the target weight and the reference component data corresponding to the first color, and determines the color shift component corresponding to the first color based on the first component data corresponding to the first color and the product of the target weight and the conversion coefficient corresponding to the first color. This achieves linear adjustment of the reference component data of the first color to obtain the luminance component, and subtracts the luminance component from the first component data to obtain the color shift component. Finally, based on the luminance component and the color shift component corresponding to the first color, accurate second component data corresponding to the first color is obtained, ensuring the display effect of the display device.

[0169] In this embodiment, the backlight driving circuit determines the first weights corresponding to red, green, and blue based on the conversion coefficients and first component data corresponding to red, green, and blue, respectively. Based on the first weights corresponding to red, green, and blue, it determines the target weights. Taking into account the brightness and conversion relationships of each color in the display screen, it determines the target weight of the component data corresponding to white. This allows the second component data corresponding to white to be determined based on the target weights and the reference component data corresponding to white. Furthermore, based on the target weights, the reference component data corresponding to red, green, and blue, their respective conversion coefficients, and their respective first component data, the second component data corresponding to red, green, and blue are determined. This enables the reasonable allocation of each color component while satisfying the white field chromaticity constraint, thereby improving the luminous efficiency of the backlight module and reducing power consumption.

[0170] In some embodiments, the backlight driving circuit is further configured to control the white light source to not emit light when the display device is in a first color gamut mode, and to control the emitting states of the red light source, the green light source and the blue light source according to the first component data corresponding to red, green and blue respectively; the backlight driving circuit is further configured to perform the step of determining the target backlight data corresponding to the first backlight zone according to the initial backlight data and the preset component data when the display device is in a second color gamut mode.

[0171] It should be noted that user needs differ in different usage scenarios, or the received video or image input signals may vary. For example, when displaying murals, high requirements are placed on color gamut and color accuracy. When using a display device in gaming or movie scenarios, both comfort and color accuracy need to be considered. RGB light sources have a larger color gamut area, capable of displaying more colors, while RGBW light sources can meet the need for a balance between comfort and color accuracy. It is understandable that when a display device is in its second color gamut mode, the corresponding color gamut is smaller than that in its first color gamut mode.

[0172] In some embodiments, the control module analyzes the image data to be displayed and controls the display device to enter a target color gamut mode that matches the image data to be displayed. The target color gamut mode includes either a first color gamut mode or a second color gamut mode.

[0173] For example, when a display device (such as a television) is powered on and then left unused for an extended period, it automatically switches to displaying a pre-stored image. If the color coordinates of this pre-stored image exceed the color gamut of the RGBW light source, then the display device needs to be controlled to enter the first color gamut mode. As another example, when the input signal to the display device is a signal with a lower color gamut (such as the BT.709 color gamut, which is the benchmark color gamut standard in the broadcast television field), the display device can be controlled to enter the second color gamut mode.

[0174] In other embodiments, the control module is also configured to receive a mode adjustment signal and control the display device to enter a target color gamut mode that matches the mode adjustment signal. For example, a user can set the target color gamut mode of the display device through an adjustment interface (such as a UI) displayed on the display device.

[0175] In this embodiment, the display device includes a first color gamut mode and a second color gamut mode. In the first color gamut mode, the white light source is turned off, so the color gamut corresponding to the first color gamut mode is relatively large. In the second color gamut mode, the light emission state of the white light source can be dynamically adjusted, thereby reducing the power consumption of the display device. The display device provides color gamut modes with different advantages, which improves the performance of the display device, meets the different needs of users, and enhances the user experience.

[0176] In some embodiments, please refer to Figure 5 The display device may also include an image processing module 510, wherein the image processing module 510 is connected to the backlight driving circuit 420, and the image processing module 510 is configured to generate initial backlight data based on the image data to be displayed and transmit the initial backlight data to the backlight driving circuit 420.

[0177] It should be noted that the image data to be displayed may refer to the video input signal or image input signal received by the display device, or it may refer to pixel data in RGB data format. This embodiment does not limit this.

[0178] For example, the image processing module 510 may include a TCON, and the backlight driving circuit 420 may include a central control board. It should be noted that RGB backlight value calculation and liquid crystal pixel compensation algorithms are complex. Related technologies generally use RGB backlight value calculation and liquid crystal pixel compensation algorithms based on the RGB architecture, and these algorithms are hardware-accelerated, making it currently impossible to calculate based on the RGBW backlight architecture. In this embodiment, the image processing module 510 first obtains initial backlight data, thereby enabling the use of RGB backlight value calculation and liquid crystal pixel compensation algorithms to obtain initial backlight data and target pixel data with better display effects. Then, the initial backlight data is converted into target backlight data, eliminating the need to adjust the backlight value calculation and liquid crystal pixel compensation algorithms. Furthermore, transmitting four component data amounts to one-third more data than transmitting three component data. In this embodiment, generating the target backlight data through the central control board instead of the image processing module 510 reduces transmission bandwidth.

[0179] In this embodiment, the image processing module generates initial backlight data based on the image data to be displayed and transmits the initial backlight data to the backlight driving circuit. Compared with the image processing module directly generating the target backlight data, this can reduce the transmission bandwidth between the image processing module and the backlight driving circuit.

[0180] In some embodiments, the backlight driving circuit may also be configured to adjust the RGB pixel data according to the second component data corresponding to white to obtain target RGB pixel data. It should be noted that the light source can cause cross-color interference to other colors of light source. Adjusting the RGB pixel data according to the second component data corresponding to white to obtain target RGB pixel data reduces cross-color interference and further improves the display effect of the display device.

[0181] Figure 6 A flowchart illustrating a control method for a display device according to an embodiment of this application is shown. This control method can be applied to any of the display devices provided in the above embodiments. The display device may include a backlight module and a liquid crystal panel, and the backlight module includes N backlight zones.

[0182] like Figure 6 As shown, the control method for the display device may include steps 602 to 606.

[0183] Step 602: Obtain the initial backlight data corresponding to the first backlight partition.

[0184] The first backlight partition is any one of the N backlight partitions, and the initial backlight data includes the first component data corresponding to red, green and blue, respectively.

[0185] Step 604: Obtain preset component data.

[0186] The preset component data includes the reference component data corresponding to red, green, blue and white respectively, when the display device displays a white field image and the color coordinates of the displayed white field image are the first target color coordinates.

[0187] Step 606: Determine the target backlight data corresponding to the first backlight zone based on the initial backlight data and the preset component data.

[0188] The target backlight data includes second component data corresponding to red, green, blue, and white, respectively. These second component data are used by the backlight module to control the emission state of the corresponding color light source. Specifically, when the initial backlight data corresponds to a white or grayscale image, the target backlight data is used by the backlight module to drive the white light source in the first backlight zone to emit light, and to drive at least one of the red, green, and blue light sources in the first backlight zone to emit light, in order to correct the color shift of the white light source.

[0189] In some embodiments, determining the target backlight data based on the initial backlight data and preset component data may include determining the target backlight data based on the initial backlight data, preset component data and first conversion data. The first conversion data includes conversion coefficients corresponding to red, green and blue, respectively. The conversion coefficients are used to indicate the conversion relationship of the driving parameters from the color coordinates corresponding to the RGB light source to the color coordinates corresponding to the RGBW light source in the white field condition.

[0190] In some embodiments, determining the target backlight data based on the initial backlight data, preset component data, and first conversion data may include determining the first weights corresponding to red, green, and blue based on the conversion coefficients and the corresponding first component data of red, green, and blue, respectively; determining the target weight based on the first weights corresponding to red, green, and blue, respectively; determining the second component data corresponding to white based on the target weight and the reference component data corresponding to white; and determining the second component data corresponding to red, green, and blue based on the target weight, the reference component data corresponding to red, green, and blue, the corresponding conversion coefficients, and the corresponding first component data of red, green, and blue, respectively.

[0191] In some embodiments, determining the target weight based on the first weights corresponding to red, green, and blue may include determining the minimum value among the first weights corresponding to red, green, and blue as the target weight.

[0192] In some embodiments, determining the second component data corresponding to red, green, and blue based on the target weight, the reference component data corresponding to red, green, and blue, the corresponding conversion coefficients, and the corresponding first component data may include determining the luminance component corresponding to the first color based on the target weight and the reference component data corresponding to the first color; determining the color shift component corresponding to the first color based on the first component data corresponding to the first color and the product of the target weight and the conversion coefficient corresponding to the first color; and determining the second component data corresponding to the first color based on the luminance component and the color shift component corresponding to the first color. Here, the first color is any one of red, green, and blue.

[0193] In some embodiments, the control method for the display device further includes, when the display device is in a first color gamut mode, controlling the white light source to not emit light, and controlling the emitting states of the red light source, the green light source, and the blue light source according to the first component data corresponding to red, green, and blue, respectively; and when the display device is in a second color gamut mode, performing the step of determining the target backlight data corresponding to the first backlight zone according to the initial backlight data and the preset component data.

[0194] In some embodiments, the display device further includes an image processing module and a backlight driving circuit. The method further includes generating initial backlight data based on the image data to be displayed by the image processing module, and transmitting the initial backlight data to the backlight driving circuit. The backlight driving circuit obtains the initial backlight data corresponding to the first backlight zone, obtains preset component data, and determines the target backlight data corresponding to the first backlight zone based on the initial backlight data and the preset component data.

[0195] This application also provides a computer-readable storage medium storing a computer program, wherein when the computer program is executed by the controller, the controller enables the controller to implement any of the control methods for display devices disclosed in this application.

[0196] This application discloses a computer program product, including a computer program that, when executed by the controller, causes the controller to implement any of the display device control methods disclosed in this application.

[0197] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0198] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0199] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; they can be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0200] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0201] If the integrated units described above are implemented as software functional units and sold or used as independent products, they can be stored in a computer-accessible memory. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several requests to cause a computer device (which can be a personal computer, server, or network device, specifically a processor in the computer device) to execute some or all of the steps of the methods described in the various embodiments of this application.

[0202] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compactdisc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0203] The foregoing has provided a detailed description of a display device and a control method for the display device disclosed in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A display device, characterized in that, include: A backlight module is configured to emit backlight, the backlight module comprising N backlight zones, each of the backlight zones comprising at least a red light source, a green light source, a blue light source and a white light source, where N is an integer greater than or equal to 1; The liquid crystal panel is configured to display an image in response to backlight emitted by the backlight module; A backlight driving circuit is connected to the backlight module, and the backlight driving circuit is configured as follows: Obtain the initial backlight data corresponding to the first backlight partition; The first backlight partition is any one of the N backlight partitions, and the initial backlight data includes first component data corresponding to red, green and blue respectively. The component data is used to characterize the brightness of the light source of the corresponding color. Acquire preset component data, the preset component data including the reference component data corresponding to red, green, blue and white respectively when the display device displays a white field image and the color coordinates of the displayed white field image are the first target color coordinates; Based on the initial backlight data and the preset component data, the target backlight data corresponding to the first backlight partition is determined. The target backlight data includes the second component data corresponding to red, green, blue and white respectively. The second component data is used by the backlight module to control the luminous state of the light source of the corresponding color. Wherein, when the initial backlight data is the backlight data corresponding to a white field image or a gray field image, the target backlight data is used to drive the white light source in the first backlight partition to emit light, and to drive at least one of the red light source, green light source, and blue light source in the first backlight partition to emit light, so as to correct the color shift of the emitted light of the white light source.

2. The display device according to claim 1, characterized in that, The initial backlight data includes first backlight data and second backlight data. The first backlight data and the second backlight data are backlight data corresponding to white screen or gray screen, and the screens corresponding to the first backlight data and the second backlight data are different. The difference between the first brightness ratio corresponding to the white light source and at least one of the second brightness ratios corresponding to the red light source, green light source and blue light source is less than a preset threshold. Wherein, the first brightness ratio is the ratio between the first brightness value and the second brightness value corresponding to the white light source, wherein the first brightness value is the brightness value of the white light source when the white light source is driven to emit light according to the second component data corresponding to white in the first target backlight data, and the first target backlight data is obtained based on the first backlight data; the second brightness value is the brightness value of the white light source when the white light source is driven to emit light according to the second component data corresponding to white in the second target backlight data, and the second target backlight data is obtained based on the second backlight data; The second brightness ratio corresponding to the first color light source is the ratio between the third brightness value and the fourth brightness value corresponding to the first color light source. The third brightness value is the brightness value of the first color light source when the first color light source is driven to emit light according to the second component data corresponding to the first color in the first target backlight data. The fourth brightness value is the brightness value of the first color light source when the first color light source is driven to emit light according to the second component data corresponding to the first color in the second target backlight data. The first color is any one of red, green and blue.

3. The display device according to claim 1, characterized in that, The step of determining the target backlight data corresponding to the first backlight partition based on the initial backlight data and the preset component data includes: Based on the initial backlight data, the preset component data, and the first conversion data, the target backlight data corresponding to the first backlight partition is determined. The first conversion data includes conversion coefficients corresponding to red, green, and blue, respectively. The conversion coefficients are used to indicate the conversion relationship of the driving parameters from the color coordinates corresponding to the RGB light source to the color coordinates corresponding to the RGBW light source in the white field condition.

4. The display device according to claim 3, characterized in that, The step of determining the target backlight data corresponding to the first backlight partition based on the initial backlight data, the preset component data, and the first conversion data includes: Based on the conversion coefficients and first component data corresponding to red, green, and blue respectively, the first weights corresponding to red, green, and blue are determined respectively; The target weight is determined based on the first weights corresponding to red, green, and blue, respectively. Based on the target weight and the baseline component data corresponding to white, determine the second component data corresponding to white; Based on the target weight, the baseline component data corresponding to red, green, and blue respectively, the corresponding conversion coefficients, and the corresponding first component data, the second component data corresponding to red, green, and blue are determined respectively.

5. The display device according to claim 4, characterized in that, The step of determining the target weight based on the first weights corresponding to red, green, and blue respectively includes: The minimum value among the first weights corresponding to red, green, and blue is determined as the target weight.

6. The display device according to claim 4, characterized in that, The step of determining the second component data corresponding to the red, green, and blue colors based on the target weight, the baseline component data corresponding to the red, green, and blue colors respectively, the corresponding conversion coefficients, and the corresponding first component data respectively includes: Based on the target weight and the reference component data corresponding to the first color, the luminance component corresponding to the first color is determined; the first color is any one of red, green, and blue. The color shift component corresponding to the first color is determined based on the first component data corresponding to the first color and the product of the target weight and the conversion coefficient corresponding to the first color. Based on the luminance component and color shift component corresponding to the first color, the second component data corresponding to the first color is determined.

7. The display device according to claim 3, characterized in that, The conversion coefficient corresponding to the light source of the first color includes the ratio of the first current value to the second current value, and the first color is any one of red, green and blue. The first current value is used to characterize the average current value of the light source of the first color when the display device displays a white field image and the color coordinates of the displayed white field image are the first target color coordinates, in the state where the white light source is off. The second current value is used to characterize the average current value of the light source of the first color when the display device displays a first image of the first color and the color coordinates of the first image are the second target color coordinates, in the state where the white light source is off; wherein, the second target color coordinates are the color coordinates corresponding to the first image of the first color displayed by the display device when the component data corresponding to red, green, blue and white are the corresponding reference component data.

8. The display device according to claim 1, characterized in that, The backlight driving circuit is further configured to: When the display device is in the first color gamut mode, the white light source is controlled not to emit light, and the emitting states of the red light source, green light source and blue light source are controlled according to the first component data corresponding to red, green and blue respectively. When the display device is in the second color gamut mode, the step of determining the target backlight data corresponding to the first backlight zone based on the initial backlight data and the preset component data is performed.

9. The display device according to any one of claims 1-8, characterized in that, The display device further includes an image processing module, which is connected to the backlight driving circuit, and the image processing module is configured to: Generate initial backlight data based on the image data to be displayed; The initial backlight data is transmitted to the backlight driving circuit.

10. A control method for a display device, characterized in that, The method is applied to a display device, the display device including a backlight module and a liquid crystal panel, the backlight module being configured to emit backlight, the backlight module including N backlight zones, each of the backlight zones including at least a red light source, a green light source, a blue light source, and a white light source, where N is an integer greater than or equal to 1, and the liquid crystal panel being configured to display an image upon receiving the backlight emitted by the backlight module; the method includes: Obtain the initial backlight data corresponding to the first backlight partition; the first backlight partition is any one of the N backlight partitions, and the initial backlight data includes the first component data corresponding to red, green and blue respectively, and the component data is used to characterize the brightness of the light source of the corresponding color; Acquire preset component data, the preset component data including the reference component data corresponding to red, green, blue and white respectively when the display device displays a white field image and the color coordinates of the displayed white field image are the first target color coordinates; Based on the initial backlight data and the preset component data, the target backlight data corresponding to the first backlight partition is determined. The target backlight data includes the second component data corresponding to red, green, blue and white respectively. The second component data is used by the backlight module to control the luminous state of the light source of the corresponding color. Wherein, when the initial backlight data is the backlight data corresponding to a white field image or a gray field image, the target backlight data is used to drive the white light source in the first backlight partition to emit light, and to drive at least one of the red light source, green light source, and blue light source in the first backlight partition to emit light, so as to correct the color shift of the emitted light of the white light source.

Images