Multi-channel spectrum-controllable liquid crystal display system and display method

Abstract

The invention discloses a multi-channel spectrum-controllable liquid crystal display system and a multi-channel spectrum-controllable liquid crystal display method. The system comprises a multi-channel backlight module, a liquid crystal display panel and a control module, the multi-channel backlight module is used for generating a backlight source comprising a plurality of spectrum sub-channels, the spectrum sub-channels cover different spectrum ranges, and the output intensity can be independently adjusted; the liquid crystal display panel comprises a liquid crystal layer, a first polaroid, a second polaroid, a red color filter, a green color filter and a blue color filter, wherein the red color filter, the green color filter and the blue color filter are arranged on the liquid crystal layer and used for conducting spectrum selection and polarization modulation on light from the multi-channel backlight module. The control module is used for cooperatively controlling the backlight output intensity of each spectrum sub-channel and the driving parameters of the liquid crystal display panel according to the display target containing the target spectrum distribution constraint on the premise of not changing the color filter structure and the pixel arrangement structure of the liquid crystal display panel; therefore, controllable reconstruction of the display spectrum output by the liquid crystal display panel is realized. An existing liquid crystal display panel structure does not need to be changed, the regulation and control freedom degree of a display system on the output spectrum can be improved, and a system-level solution is provided for achieving the display effect close to natural spectrum distribution.

Description

Technical Field

[0001] This invention relates to the field of display technology, specifically to a multi-channel spectrally controllable liquid crystal display system and display method, and more particularly to a liquid crystal display system that achieves controllable reconstruction of the display output spectrum by co-modulating multiple spectral sub-channel backlights with the liquid crystal display panel. Background Technology

[0002] Liquid crystal displays (LCDs) are widely used in various display terminals due to their mature manufacturing process and low cost. Existing LCD systems typically use red, green, and blue three-primary-color backlight sources, along with an LCD panel structure that includes a first polarizer, a liquid crystal layer, a second polarizer, and red, green, and blue color filters, to polarize and select the spectrum of the backlight, thereby achieving color display.

[0003] However, this type of display primarily focuses on color matching and brightness adjustment. Its output spectral distribution is limited by the combined characteristics of the backlight source and color filter, resulting in a significant difference from the continuous spectral distribution under natural lighting conditions. In applications requiring highly realistic displays, spectrally consistent displays, or those approaching natural lighting conditions, display systems often need to output a continuous spectral distribution that approximates the spectral morphology of natural lighting conditions, such as the D65 standard natural daylight spectral distribution defined by the International Commission on Illumination (CIE). Existing LCD systems, due to limitations in their backlight spectrum and color filter structure, struggle to effectively approximate this target spectral distribution.

[0004] To improve display performance, existing technologies have attempted to expand display capabilities by increasing the number of display primary colors, introducing additional sub-pixels, or using narrowband color filters. However, such solutions usually require changes to the pixel structure or color filter structure of the display panel, which can easily lead to a decrease in display resolution, complex manufacturing processes, and increased system costs.

[0005] In addition, existing backlight modulation technologies mostly focus on brightness or contrast adjustment, and pay insufficient attention to the fine control of the display output spectrum. There is still a lack of a systematic solution to achieve controllable reconstruction of the display output spectrum without changing the existing LCD panel structure.

[0006] Therefore, it is necessary to propose a new liquid crystal display system structure and display method to overcome the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a multi-channel spectrally controllable liquid crystal display system and display method to solve the problems of limited display output spectrum and difficulty in spectral-level control in existing liquid crystal display systems.

[0008] A further objective of this invention is to achieve controllable reconstruction of the display output spectrum by means of coordinated modulation of multi-channel spectral sub-channel backlight and liquid crystal display panel without changing the existing color filter structure of liquid crystal display panel, thereby improving the degree of freedom of display system in regulating output spectrum.

[0009] To achieve the above objectives, the present invention adopts the following technical solution.

[0010] This invention provides a multi-channel spectrally controllable liquid crystal display system, including a multi-channel backlight module, a liquid crystal display panel, and a control module.

[0011] The multi-channel backlight module is used to generate a backlight source containing multiple spectral sub-channels. Each spectral sub-channel covers a different spectral range, and the output intensity of each spectral sub-channel can be adjusted independently.

[0012] The liquid crystal display panel includes a liquid crystal layer, a first polarizer, a second polarizer, and red, green, and blue color filters disposed on the liquid crystal layer, which are used to perform spectral selection and polarization modulation on light from the multi-channel backlight module.

[0013] The control module is used to control the output intensity of each spectral sub-channel in the multi-channel backlight module according to the display target including the target spectral distribution constraint, without changing the color filter structure and pixel arrangement structure of the liquid crystal display panel, and works in coordination with the driving parameters of the liquid crystal display panel to achieve controllable reconstruction of the display spectrum output by the liquid crystal display panel.

[0014] In one embodiment of the present invention, the display output spectrum of the liquid crystal display system is the superposition result of the backlights of each spectral sub-channel generated by the multi-channel backlight module after being modulated by the liquid crystal display panel. The modulation process of the liquid crystal display panel includes polarization modulation and spectral selective modulation of red, green and blue color filters.

[0015] The display output spectrum can be expressed as:

[0016]

[0017] in:

[0018] This indicates the display spectrum output by the liquid crystal display panel;

[0019] Indicates the first Spectral distribution of the backlight in each spectral sub-channel;

[0020] These represent the spectral transmission characteristics of the red, green, and blue filters, respectively.

[0021] These represent the driving modulation coefficients for the corresponding red, green, and blue sub-pixels, respectively.

[0022] This indicates the overall polarization transmission characteristics of the liquid crystal layer and polarizer.

[0023] Indicates the number of spectral sub-channels, and .

[0024] By adjusting the output intensity of the backlight of each spectral sub-channel and the driving modulation coefficients of the red, green, and blue sub-pixels, the display output spectrum can meet the constraint requirements of the target display spectral distribution within a predetermined spectral range.

[0025] Based on the above system structure, the present invention also provides a multi-channel spectrally controllable liquid crystal display method, comprising the following steps:

[0026] Obtain a display target that includes a target display spectral distribution constraint, wherein the target display spectral distribution is used to describe the desired display output spectral shape, and the target display spectral distribution may be a continuous natural spectral distribution or a spectral distribution corresponding to a standard spectral distribution under natural lighting conditions, wherein the standard spectral distribution includes, but is not limited to, the D65 standard natural daylight spectral distribution defined by the International Commission on Illumination (CIE);

[0027] Based on the target display spectral distribution, set the output intensity of the backlight for each spectral sub-channel;

[0028] The liquid crystal display panel is controlled to modulate the multi-channel backlight so that the display spectrum output by the liquid crystal display panel approximates the target display spectrum distribution within a predetermined spectral range.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] This invention does not require changes to the pixel structure or color filter structure of existing liquid crystal display panels, and has good engineering compatibility;

[0031] The independent control of multi-spectral sub-channel backlight increases the degree of freedom in the display system to adjust the output spectrum.

[0032] It can achieve controllable reconstruction of the display output spectral shape while maintaining the existing color display function;

[0033] A system-level technical solution is provided to achieve a display effect that approximates the natural spectral distribution. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the overall structure of the multi-channel spectrum controllable liquid crystal display system of the present invention;

[0036] Figure 2 This is a schematic diagram of the spectral distribution of multiple spectral sub-channels in a multi-channel backlight module;

[0037] Figure 3 This is a schematic diagram of the display output spectrum reconstruction after the multi-channel backlight is modulated by the liquid crystal display panel;

[0038] Figure 4 A schematic diagram showing the comparison between the target spectral distribution and the reconstructed output spectrum of this invention;

[0039] Figure 5 This is a schematic diagram of a matrix for the coordinated modulation of multi-channel spectral sub-channels and red, green, and blue sub-pixels. Detailed Implementation

[0040] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0041] Example 1: Multi-channel Spectrum Controllable Liquid Crystal Display System

[0042] like Figure 1 As shown, the multi-channel spectrum controllable liquid crystal display system provided by the present invention includes a multi-channel backlight module 1, a liquid crystal display panel 2, and a control module 3.

[0043] The multi-channel backlight module 1 is used to generate a backlight source containing multiple spectral sub-channels, each covering a different spectral range, and the output intensity of each spectral sub-channel can be adjusted independently. The spectral range of the spectral sub-channel can be a continuous or discontinuous spectral interval, and the spectral ranges between different spectral sub-channels can partially overlap or not overlap.

[0044] The liquid crystal display panel 2 includes a first polarizer, a liquid crystal layer, a second polarizer, and red, green, and blue color filters disposed on the liquid crystal layer, used for polarization modulation and spectral selective modulation of light from the multi-channel backlight module 1. The color filter structure of the liquid crystal display panel 2 remains unchanged as a result of the implementation of this invention.

[0045] The control module 3 is electrically connected to the multi-channel backlight module 1 and the liquid crystal display panel 2, respectively. It is used to coordinately control the output intensity of the backlight of each spectral sub-channel and the driving parameters of the red, green and blue sub-pixels in the liquid crystal display panel according to the display target including the target display spectral distribution constraints, so as to realize the controllable reconstruction of the display spectrum output by the liquid crystal display panel.

[0046] Example 2: The process of reconstructing the display spectrum

[0047] like Figure 2 As shown, the multi-channel backlight module includes N spectral sub-channels (N≥4), each covering a different spectral range. At least some of the spectral sub-channels overlap, thus forming a multi-channel spectral structure that continuously covers the visible spectrum, providing a basis for fine reconstruction of the display spectrum.

[0048] like Figure 3 and Figure 5 As shown, during the display process, the control module 3 determines the output intensity of each spectral sub-channel in the multi-channel backlight module 1 according to the preset target display spectral distribution, so that the combined spectrum generated by the multi-channel backlight module 1 is modulated by the liquid crystal display panel 2 to form a display output spectrum that satisfies the constraints of the target display spectral distribution. The display output spectrum of the present invention is the result of the superposition of the spectra of the multi-channel backlight modulated by the liquid crystal display panel, and its spectral reconstruction model can be expressed as:

[0049]

[0050] in,

[0051] This represents the spectral distribution of the backlight in the i-th spectral sub-channel;

[0052] These represent the spectral transmission characteristics of the red, green, and blue filters, respectively.

[0053] These represent the driving modulation coefficients for the corresponding red, green, and blue sub-pixels, respectively.

[0054] This indicates the overall polarization transmission characteristics of the liquid crystal layer and polarizer.

[0055] By adjusting the output intensity of each spectral sub-channel and the driving modulation coefficients of the red, green, and blue sub-pixels, the display output spectrum can be controlled within a predetermined spectral range.

[0056] Example 3: Target Spectrum-Driven Display Method

[0057] like Figure 4As shown, in this embodiment, the target display spectral distribution is the D65 standard natural daylight spectral distribution defined by the International Commission on Illumination (CIE). Based on this target spectral distribution, the control module adjusts the output intensity of each spectral sub-channel and the driving parameters of the red, green, and blue sub-pixels to make the display spectrum output by the liquid crystal display panel approximate the target display spectral distribution within a predetermined spectral range, thereby achieving a display effect close to natural lighting conditions.

[0058] Example 4: Display Method Implementation Process

[0059] Based on the above system structure, a display method of the present invention includes the following steps:

[0060] 1) Obtain the display target that includes the target display spectral distribution constraints;

[0061] 2) Based on the target display spectral distribution, set the output intensity of the backlight for each spectral sub-channel;

[0062] 3) Control the liquid crystal display panel to modulate the multi-channel backlight so that the display spectrum output by the liquid crystal display panel approximates the target display spectrum distribution within a predetermined spectral range.

[0063] It should be noted that the present invention is not limited to the above embodiments. Without departing from the core technical concept of the present invention, those skilled in the art can make various equivalent modifications or substitutions to the number of spectral sub-channels, spectral range, and control methods, and such modifications or substitutions should all fall within the protection scope of the present invention.

Claims

1. A multi-channel spectrally controllable liquid crystal display system, characterized in that, include: A multi-channel backlight module is used to generate a backlight source containing multiple spectral sub-channels, each covering a different spectral range, and the output intensity of each spectral sub-channel can be adjusted independently. A liquid crystal display panel includes a liquid crystal layer, a first polarizer, a second polarizer, and red, green, and blue color filters disposed on the liquid crystal layer, used for spectral selection and polarization modulation of light from the multi-channel backlight module; The control module is used to control the output intensity of each spectral sub-channel in the multi-channel backlight module according to the display target including the target spectral distribution constraint, without changing the color filter structure and pixel arrangement structure of the liquid crystal display panel, and to work in coordination with the driving parameters of the liquid crystal display panel to achieve controllable reconstruction of the display spectrum output by the liquid crystal display panel.

2. The liquid crystal display system according to claim 1, characterized in that, The number of spectral sub-channels is four or more.

3. The liquid crystal display system according to claim 1, characterized in that, The spectral ranges of each spectral subchannel are different from each other, and at least some of the spectral ranges of the spectral subchannels overlap.

4. The liquid crystal display system according to claim 1, characterized in that, The multi-channel backlight module and the liquid crystal display panel are structurally and drivingly independent of each other.

5. The liquid crystal display system according to claim 1, characterized in that, The display target includes at least the target display spectral distribution.

6. The liquid crystal display system according to claim 1, characterized in that, The control module is used to calculate the output intensity of each spectral sub-channel based on the target display spectral distribution.

7. The liquid crystal display system according to claim 1, characterized in that, The multi-channel backlight module includes multiple independently driven light source units.

8. A display method based on the liquid crystal display system according to any one of claims 1 to 7, characterized in that, include: Obtain the display target that includes the target display spectral distribution constraints; The output intensity of the backlight for each spectral sub-channel is set according to the display target. The liquid crystal display panel is controlled to modulate the multi-channel backlight to obtain the target display spectrum output by the liquid crystal display panel.

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