A method and device for improving color rendering index of LED display screen

Abstract

The application discloses a method and device for improving color rendering index of an LED display screen, and the method comprises the following steps: adding a first white light sub-pixel W1 and a second white light sub-pixel W2 in an RGB display unit of the LED display screen to form an RGBW1W2 screen; obtaining the luminance characteristics of each sub-pixel in the RGBW1W2 screen, and constructing a characteristic conversion matrix of the RGBW1W2 screen according to the luminance characteristics; obtaining the output signals of each sub-pixel in the RGBW1W2 screen according to a to-be-transmitted rgb signal and the characteristic conversion matrix of the RGBW1W2 screen; and adjusting the output proportion of the first white light sub-pixel W1 and the second white light sub-pixel W2 to realize color temperature adjustment. The W1 and W2 are added in the RGB display screen, the color temperature of the screen can be accurately adjusted, and the high color rendering index can be maintained. Meanwhile, the method can ensure the color temperature of the screen.

Description

Technical Field

[0001] This invention relates to the field of LED display technology, and more specifically, to a method and apparatus for improving the color rendering index of an LED display screen. Background Technology

[0002] In the field of display technology, the color rendering index (CRI) is an important indicator of a light source's ability to reproduce the colors of objects. It reflects the degree of realism between the colors of objects under a given light source and those under natural light (such as sunlight). Light sources with a high CRI can more accurately reproduce the true colors of objects, enhancing the visual experience, and therefore have wide applications in high-end display devices, photography, and design. Traditional LED displays use a mixture of red (R), green (G), and blue (B) primary colors to present various colors, but this approach has limitations in color rendering, especially when it needs to reproduce colors close to natural light, often failing to achieve the desired color rendering effect. To improve this situation, the industry has attempted to add a white (W) light source to LED displays, forming RGBW displays, hoping to improve the CRI by increasing the white light component.

[0003] However, existing RGBW display solutions have significant shortcomings in color temperature adjustment. Specifically, when adjusting the display's color temperature to suit different environments or application requirements, the color rendering index often drops significantly, resulting in weakened color reproduction capabilities and failing to meet the high color rendering requirements of application scenarios. This deficiency limits the further promotion and application of RGBW displays in the high-end display market.

[0004] Therefore, those skilled in the art urgently need to develop a new solution to address the aforementioned problems. Summary of the Invention

[0005] To overcome the problems existing in related technologies, the present invention discloses a method and apparatus for improving the color rendering index of an LED display screen.

[0006] According to a first aspect of the present invention, a method for improving the color rendering index of an LED display screen is provided, the method comprising:

[0007] A first white sub-pixel W1 and a second white sub-pixel W2 are added to the RGB display unit of the LED display screen to form an RGBW1W2 screen.

[0008] Obtain the brightness characteristics of each sub-pixel in the RGBW1W2 screen, and construct the RGBW1W2 screen characteristic transformation matrix based on the brightness characteristics;

[0009] Based on the RGB signal to be transmitted and the RGBW1W2 screen characteristic conversion matrix, the output signal of each sub-pixel in the RGBW1W2 screen is obtained;

[0010] Color temperature adjustment is achieved by adjusting the output ratio of the first white photon sub-pixel W1 and the second white photon sub-pixel W2.

[0011] Optionally, obtaining the luminance characteristics of each sub-pixel in the RGBW1W2 screen and constructing the RGBW1W2 screen characteristic transformation matrix based on the luminance characteristics includes:

[0012] The luminance coordinate values ​​of each sub-pixel of the RGBW1W2 screen are measured when the grayscale value is 255, so as to determine the tristimulus value matrix of each sub-pixel based on the luminance coordinate values ​​of each sub-pixel.

[0013] The brightness characteristics of the first white light sub-pixel W1 and the second white light sub-pixel W2 in the RGBW1W2 screen are determined based on the tristimulus value matrix of each sub-pixel.

[0014] The RGBW1W2 screen characteristic conversion matrix is ​​constructed based on the brightness characteristics.

[0015] Optionally, the brightness characteristics of the first white photon sub-pixel W1 are as follows: ,in, , This represents the tristimulus value matrix of the RGB LEDs. The matrix representing the tristimulus values ​​of W1;

[0016] The brightness characteristics of the second white photon sub-pixel W2 are as follows: ,in , This represents the tristimulus matrix of W2.

[0017] Optionally, the RGBW1W2 screen characteristic conversion matrix is:

[0018] Where R, G, and B represent the output signals of the RGB LEDs, r, g, and b represent the input signals corresponding to the RGB LEDs in the signal to be transmitted, and p is the first conversion coefficient. q is the second conversion coefficient. , gamMax represents the maximum output value of the first white sub-pixel W1 and the second white sub-pixel W2 after gamma correction, and x and y represent the brightness coordinates of the sub-pixel when the grayscale value is 255.

[0019] Optionally, the method further includes:

[0020] While adjusting the output ratio of the first white sub-pixel W1 and the second white sub-pixel W2, the total spectral power distribution of each sub-pixel is kept above 90%.

[0021] Optionally, obtaining the output signal of each sub-pixel in the RGBW1W2 screen based on the RGB signal to be transmitted and the RGBW1W2 screen characteristic conversion matrix includes:

[0022] Acquire the RGB signal to be transmitted;

[0023] The input signal corresponding to the RGB light point in the RGB to be transmitted is used as the input of the RGBW1W2 screen characteristic conversion matrix, and the output signal of the RGB light point is determined according to the output of the RGBW1W2 screen characteristic conversion matrix.

[0024] According to a second aspect of the disclosed embodiments of the present invention, an apparatus for improving the color rendering index of an LED display screen is provided, the apparatus comprising:

[0025] The screen building module adds a first white sub-pixel W1 and a second white sub-pixel W2 to the RGB display unit of the LED display screen to form an RGBW1W2 screen.

[0026] The matrix acquisition module is connected to the screen construction module, acquires the brightness characteristics of each sub-pixel in the RGBW1W2 screen, and constructs the RGBW1W2 screen characteristic transformation matrix based on the brightness characteristics;

[0027] The output signal acquisition module is connected to the matrix acquisition module and acquires the output signal of each sub-pixel in the RGBW1W2 screen according to the RGB signal to be transmitted and the RGBW1W2 screen characteristic conversion matrix.

[0028] The color temperature adjustment module is connected to the output signal acquisition module and adjusts the color temperature by adjusting the output ratio of the first white photon sub-pixel W1 and the second white photon sub-pixel W2.

[0029] Optionally, the matrix acquisition module includes:

[0030] The screen measurement unit measures the brightness coordinates of each sub-pixel of the RGBW1W2 screen when the grayscale value is 255, so as to determine the tristimulus value matrix of each sub-pixel based on the brightness coordinates of each sub-pixel.

[0031] A brightness characteristic acquisition unit is connected to the screen measurement unit and determines the brightness characteristics of the first white light sub-pixel W1 and the second white light sub-pixel W2 in the RGBW1W2 screen according to the tristimulus value matrix of each sub-pixel.

[0032] The conversion matrix acquisition unit is connected to the brightness characteristic acquisition unit, and constructs the RGBW1W2 screen characteristic conversion matrix based on the brightness characteristics.

[0033] Optionally, the device further includes:

[0034] While adjusting the output ratio of the first white sub-pixel W1 and the second white sub-pixel W2, the total spectral power distribution of each sub-pixel is kept above 90%.

[0035] Optionally, the output signal acquisition module includes:

[0036] The signal acquisition unit acquires the RGB signal to be transmitted.

[0037] The output signal acquisition unit is connected to the signal acquisition unit to be transmitted. It takes the input signal corresponding to the RGB light point in the RGB light to be transmitted as the input of the RGBW1W2 screen characteristic conversion matrix, and determines the output signal of the RGB light point according to the output of the RGBW1W2 screen characteristic conversion matrix.

[0038] In summary, this invention discloses a method and apparatus for improving the color rendering index of an LED display screen. The method includes: adding a first white sub-pixel W1 and a second white sub-pixel W2 to the RGB display unit of the LED display screen to form an RGBW1W2 screen; acquiring the brightness characteristics of each sub-pixel in the RGBW1W2 screen and constructing an RGBW1W2 screen characteristic conversion matrix based on the brightness characteristics; acquiring the output signal of each sub-pixel in the RGBW1W2 screen based on the RGB signal to be transmitted and the RGBW1W2 screen characteristic conversion matrix; and adjusting the color temperature by adjusting the output ratio of the first white sub-pixel W1 and the second white sub-pixel W2. By adding W1 and W2 to the RGB display screen, accurate screen color temperature and a high color rendering index can be maintained. Simultaneously, this method ensures accurate screen color temperature.

[0039] Other features and advantages disclosed in this invention will be described in detail in the following detailed description section. Attached Figure Description

[0040] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0041] Figure 1 This is a flowchart illustrating a method for improving the color rendering index of an LED display screen according to an exemplary embodiment;

[0042] Figure 2 It is based on Figure 1 A flowchart illustrating a method for obtaining a screen characteristic transformation matrix is ​​shown.

[0043] Figure 3 It is based on Figure 1A flowchart illustrating a method for converting a signal to be transmitted is shown.

[0044] Figure 4 This is a schematic diagram of a device for improving the color rendering index of an LED display screen, according to an exemplary embodiment.

[0045] Figure 5 It is based on Figure 4 The diagram shown is a structural schematic of a matrix acquisition module;

[0046] Figure 6 It is based on Figure 4 The diagram shows a structural schematic of an output signal acquisition module. Detailed Implementation

[0047] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present disclosure.

[0048] Figure 1 This is a flowchart illustrating a method for improving the color rendering index of an LED display screen according to an exemplary embodiment, such as... Figure 1 As shown, the method includes:

[0049] In step 101, a first white sub-pixel W1 and a second white sub-pixel W2 are added to the RGB display unit of the LED display screen to form an RGBW1W2 screen.

[0050] For example, in the disclosed embodiments of the present invention, two white sub-pixels with different characteristics (i.e., the first white sub-pixel W1 and the second white sub-pixel W2) are added to the traditional RGB display screen to form a pixel structure with 5 transmission channels, thus constituting an RGBW1W2 screen.

[0051] It's important to note that traditional RGB displays rely on mixing red (R), green (G), and blue (B) LEDs to generate white light. However, this spectrum is discontinuous, resulting in poor color reproduction (CRI is typically <80). Adjusting the color temperature requires changing the RGB ratio, which significantly lowers the CRI (e.g., increasing blue light for cooler color temperatures reduces red color rendering). Therefore, adding two white light sub-pixels with different characteristics allows for the priority use of W1 / W2 (with higher luminous efficacy than RGB mixing) when high brightness is needed. When displaying white light, W1 / W2 is used directly, reducing the use of RGB sub-pixels.

[0052] In step 102, the brightness characteristics of each sub-pixel in the RGBW1W2 screen are obtained, and the characteristic transformation matrix of the RGBW1W2 screen is constructed based on the brightness characteristics.

[0053] For example, in the RGBW1W2 screen, the input signal is traditional RGB three-channel data, but the actual driving requires controlling the brightness of five-channel sub-pixels (R, G, B, W1, W2). Therefore, a screen characteristic conversion matrix needs to be established to convert the signal to be transmitted from RGB (represented by rgb in the disclosed embodiment of the present invention for distinction) input to RGBW1W2 output.

[0054] Specifically, Figure 2 It is based on Figure 1 The diagram illustrates a method for obtaining a screen characteristic transformation matrix. Figure 2 As shown, step 102 includes:

[0055] In step 1021, the luminance coordinate values ​​of each sub-pixel of the RGBW1W2 screen are measured when the grayscale value is 255, so as to determine the tristimulus value matrix of each sub-pixel based on the luminance coordinate values ​​of each sub-pixel.

[0056] For example, a light gun is used to measure the luminance coordinates of each sub-pixel in the RGBW1W2 screen at its maximum brightness (grayscale value of 255), and the tristimulus value matrix is ​​determined.

[0057] In step 1022, the brightness characteristics of the first white light sub-pixel W1 and the second white light sub-pixel W2 in the RGBW1W2 screen are determined based on the tristimulus value matrix of each sub-pixel.

[0058] For example, the brightness characteristics of the first white sub-pixel W1 are as follows: ,in, , This represents the tristimulus value matrix of the RGB LEDs. The matrix representing the tristimulus values ​​of W1;

[0059] The brightness characteristics of the second white photon pixel W2 are as follows: ,in , This represents the tristimulus matrix of W2.

[0060] In step 1023, the RGBW1W2 screen characteristic conversion matrix is ​​constructed based on the brightness characteristics.

[0061] For example, the RGBW1W2 screen characteristic transformation matrix is ​​as follows:

[0062] Where R, G, and B represent the output signals of the RGB LEDs, r, g, and b represent the input signals corresponding to the RGB LEDs in the signal to be transmitted, and p is the first conversion coefficient. q is the second conversion coefficient. , , gamMax represents the maximum output value of the first white sub-pixel W1 and the second white sub-pixel W2 after gamma correction, and x and y represent the brightness coordinates of the sub-pixel when the grayscale value is 255. In the above formula, the optimal solutions x and y are found, and when n=1, the color rendering index of the screen can be greatly improved.

[0063] It is understandable that p represents the first conversion coefficient from RGB to the first white sub-pixel W1, and p represents the second conversion coefficient from RGB to the second white sub-pixel W2.

[0064] In another embodiment of the present invention, for scenarios where customers require the screen to achieve greater brightness, the screen brightness needs to be adjusted by the super-high brightness index m.

[0065] in, , , , , k1, k2, and k3 are weighting coefficients. The super-display index m is 0 by default. When m is not 0, the screen's color temperature cannot be guaranteed.

[0066] In step 103, the output signal of each sub-pixel in the RGBW1W2 screen is obtained according to the RGB signal to be transmitted and the characteristic conversion matrix of the RGBW1W2 screen.

[0067] Specifically, Figure 3 It is based on Figure 1 The diagram shows a flowchart of a method for converting a signal to be transmitted. Figure 3 As shown, step 103 includes:

[0068] In step 1031, the RGB signal to be transmitted is acquired.

[0069] In step 1032, the input signal corresponding to the RGB light point in the RGB to be transmitted is used as the input of the RGBW1W2 screen characteristic conversion matrix, and the output signal of the RGB light point is determined according to the output of the RGBW1W2 screen characteristic conversion matrix.

[0070] For example, raw RGB three-channel image data (RGB signal to be transmitted) is received from a video source (such as a GPU or image sensor), and the RGB three-channel image data is converted into a 5-channel sub-pixel output signal through the RGBW1W2 screen feature conversion matrix.

[0071] In step 104, color temperature adjustment is achieved by adjusting the output ratio of the first white sub-pixel W1 and the second white sub-pixel W2.

[0072] For example, by changing the brightness ratio of the first white photon sub-pixel W1 (usually cool white) and the second white photon sub-pixel W2 (usually warm white), a continuous color temperature adjustment of 2700K-6500K can be achieved.

[0073] Optionally, the method further includes:

[0074] While adjusting the output ratio of the first white sub-pixel W1 and the second white sub-pixel W2, the total spectral power distribution of each sub-pixel is kept above 90%.

[0075] Figure 4 This is a schematic diagram illustrating the structure of an apparatus for improving the color rendering index of an LED display screen according to an exemplary embodiment, such as... Figure 4 As shown, the device 400 includes:

[0076] The screen building module 410 adds a first white light sub-pixel W1 and a second white light sub-pixel W2 to the RGB display unit of the LED display screen to form an RGBW1W2 screen.

[0077] The matrix acquisition module 420 is connected to the screen construction module 410, acquires the brightness characteristics of each sub-pixel in the RGBW1W2 screen, and constructs the RGBW1W2 screen characteristic transformation matrix based on the brightness characteristics.

[0078] The output signal acquisition module 430 is connected to the matrix acquisition module 420. It acquires the output signal of each sub-pixel in the RGBW1W2 screen according to the RGB signal to be transmitted and the characteristic conversion matrix of the RGBW1W2 screen.

[0079] The color temperature adjustment module 440 is connected to the output signal acquisition module 430, and achieves color temperature adjustment by adjusting the output ratio of the first white photon sub-pixel W1 and the second white photon sub-pixel W2.

[0080] Figure 5 It is based on Figure 4 The diagram shown illustrates the structure of a matrix acquisition module, such as... Figure 5 As shown, the matrix acquisition module 420 includes:

[0081] The screen measurement unit 421 measures the brightness coordinate value of each sub-pixel of the RGBW1W2 screen when the grayscale value is 255, so as to determine the tristimulus value matrix of each sub-pixel based on the brightness coordinate value of each sub-pixel.

[0082] The brightness characteristic acquisition unit 422 is connected to the screen measurement unit 421, and determines the brightness characteristics of the first white light sub-pixel W1 and the second white light sub-pixel W2 in the RGBW1W2 screen according to the tristimulus value matrix of each sub-pixel.

[0083] The conversion matrix acquisition unit 423 is connected to the brightness characteristic acquisition unit 422, and constructs the RGBW1W2 screen characteristic conversion matrix based on the brightness characteristic.

[0084] Optionally, the device may also include:

[0085] While adjusting the output ratio of the first white sub-pixel W1 and the second white sub-pixel W2, the total spectral power distribution of each sub-pixel is kept above 90%.

[0086] Figure 6 It is based on Figure 4 The diagram shown illustrates the structure of an output signal acquisition module, such as... Figure 6 As shown, the output signal acquisition module 430 includes:

[0087] The signal acquisition unit 431 acquires the RGB signal to be transmitted.

[0088] The output signal acquisition unit 432 is connected to the signal acquisition unit 431 to be transmitted. It uses the input signal corresponding to the RGB light point in the RGB light to be transmitted as the input of the RGBW1W2 screen characteristic conversion matrix, and determines the output signal of the RGB light point according to the output of the RGBW1W2 screen characteristic conversion matrix.

[0089] In summary, this invention discloses a method and apparatus for improving the color rendering index of an LED display screen. The method includes: adding a first white sub-pixel W1 and a second white sub-pixel W2 to the RGB display unit of the LED display screen to form an RGBW1W2 screen; acquiring the brightness characteristics of each sub-pixel in the RGBW1W2 screen and constructing an RGBW1W2 screen characteristic conversion matrix based on the brightness characteristics; acquiring the output signal of each sub-pixel in the RGBW1W2 screen based on the RGB signal to be transmitted and the RGBW1W2 screen characteristic conversion matrix; and adjusting the color temperature by adjusting the output ratio of the first white sub-pixel W1 and the second white sub-pixel W2. By adding W1 and W2 to the RGB display screen, accurate screen color temperature and a high color rendering index can be maintained. Simultaneously, this method ensures accurate screen color temperature.

[0090] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0091] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0092] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A method for improving the color rendering index of an LED display screen, characterized in that, The method includes: Add a first white sub-pixel W1 and a second white sub-pixel W2 with different characteristics to the RGB display unit of the LED display screen to form an RGBW1W2 screen; Obtain the brightness characteristics of each sub-pixel in the RGBW1W2 screen, and construct the RGBW1W2 screen characteristic transformation matrix based on the brightness characteristics; Based on the RGB signal to be transmitted and the RGBW1W2 screen characteristic conversion matrix, the output signal of each sub-pixel in the RGBW1W2 screen is obtained; Color temperature adjustment is achieved by adjusting the output ratio of the first white photon sub-pixel W1 and the second white photon sub-pixel W2; The step of obtaining the brightness characteristics of each sub-pixel in the RGBW1W2 screen and constructing the RGBW1W2 screen characteristic transformation matrix based on the brightness characteristics includes: The luminance coordinate values ​​of each sub-pixel of the RGBW1W2 screen are measured when the grayscale value is 255, so as to determine the tristimulus value matrix of each sub-pixel based on the luminance coordinate values ​​of each sub-pixel. The brightness characteristics of the first white light sub-pixel W1 and the second white light sub-pixel W2 in the RGBW1W2 screen are determined based on the tristimulus value matrix of each sub-pixel. The RGBW1W2 screen characteristic conversion matrix is ​​constructed based on the brightness characteristics.

2. The method for improving the color rendering index of an LED display screen according to claim 1, characterized in that, The brightness characteristics of the first white photon sub-pixel W1 are as follows: ,in, , This represents the tristimulus value matrix of the RGB LEDs. The matrix representing the tristimulus values ​​of W1; The brightness characteristics of the second white photon sub-pixel W2 are as follows: ,in , This represents the tristimulus matrix of W2.

3. The method for improving the color rendering index of an LED display screen according to claim 2, characterized in that, The RGBW1W2 screen characteristic conversion matrix is ​​as follows: Where R, G, and B represent the output signals of the RGB LEDs, r, g, and b represent the input signals corresponding to the RGB LEDs in the signal to be transmitted, and p is the first conversion coefficient. q is the second conversion coefficient. , gamMax represents the maximum output value of the first white sub-pixel W1 and the second white sub-pixel W2 after gamma correction, and x and y represent the brightness coordinates of the sub-pixel when the grayscale value is 255.

4. The method for improving the color rendering index of an LED display screen according to claim 1, characterized in that, The method further includes: While adjusting the output ratio of the first white sub-pixel W1 and the second white sub-pixel W2, the total spectral power distribution of each sub-pixel is kept above 90%.

5. The method for improving the color rendering index of an LED display screen according to claim 1, characterized in that, The step of obtaining the output signal of each sub-pixel in the RGBW1W2 screen based on the RGB signal to be transmitted and the RGBW1W2 screen characteristic conversion matrix includes: Acquire the RGB signal to be transmitted; The input signal corresponding to the RGB light point in the RGB to be transmitted is used as the input of the RGBW1W2 screen characteristic conversion matrix, and the output signal of the RGB light point is determined according to the output of the RGBW1W2 screen characteristic conversion matrix.

6. An apparatus for improving the color rendering index of an LED display screen, characterized in that, The device includes: The screen building module adds a first white sub-pixel W1 and a second white sub-pixel W2 with different characteristics to the RGB display unit of the LED display screen to form an RGBW1W2 screen. The matrix acquisition module is connected to the screen construction module, acquires the brightness characteristics of each sub-pixel in the RGBW1W2 screen, and constructs the RGBW1W2 screen characteristic transformation matrix based on the brightness characteristics; The output signal acquisition module is connected to the matrix acquisition module and acquires the output signal of each sub-pixel in the RGBW1W2 screen according to the RGB signal to be transmitted and the RGBW1W2 screen characteristic conversion matrix. The color temperature adjustment module is connected to the output signal acquisition module and achieves color temperature adjustment by adjusting the output ratio of the first white photon sub-pixel W1 and the second white photon sub-pixel W2. The matrix acquisition module includes: The screen measurement unit measures the brightness coordinates of each sub-pixel of the RGBW1W2 screen when the grayscale value is 255, so as to determine the tristimulus value matrix of each sub-pixel based on the brightness coordinates of each sub-pixel. A brightness characteristic acquisition unit is connected to the screen measurement unit and determines the brightness characteristics of the first white light sub-pixel W1 and the second white light sub-pixel W2 in the RGBW1W2 screen according to the tristimulus value matrix of each sub-pixel. The conversion matrix acquisition unit is connected to the brightness characteristic acquisition unit, and constructs the RGBW1W2 screen characteristic conversion matrix based on the brightness characteristics.

7. The apparatus for improving the color rendering index of an LED display screen according to claim 6, characterized in that, The device further includes: While adjusting the output ratio of the first white sub-pixel W1 and the second white sub-pixel W2, the total spectral power distribution of each sub-pixel is kept above 90%.

8. The apparatus for improving the color rendering index of an LED display screen according to claim 6, characterized in that, The output signal acquisition module includes: The signal acquisition unit acquires the RGB signal to be transmitted. The output signal acquisition unit is connected to the signal acquisition unit to be transmitted. It takes the input signal corresponding to the RGB light point in the RGB light to be transmitted as the input of the RGBW1W2 screen characteristic conversion matrix, and determines the output signal of the RGB light point according to the output of the RGBW1W2 screen characteristic conversion matrix.

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