CN115903318A - LCD projection display device and display method - Google Patents
LCD projection display device and display method Download PDFInfo
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Abstract
The invention discloses an LCD projection display device and a display method, the display device of the invention adjusts light through two liquid crystal layers, a first liquid crystal layer controls the transmission or shielding of the light according to the brightness information of an image, a second liquid crystal layer controls the transmission or shielding of the light according to the brightness value of a color signal, and the same polarity of the first liquid crystal layer and the second liquid crystal layer is controlled, thereby leading a backlight source to emit light and then to pass through the first liquid crystal layer for the first time, leading the accuracy of the brightness of the light after passing through the first shielding to be further improved, realizing the backlight switch of a pixel point level, leading the pixel point displayed in black to reach a completely black state, leading the backlight of the pixel point displayed in bright to be normally transmitted, further realizing the image display of a neighboring area with higher contrast, and achieving the effect of improving the image contrast of the image.
Description
Technical Field
The invention relates to the field of LCD projection equipment, in particular to an LCD projection display device and a display method.
Background
The existing LCD projection mainly adjusts the contrast by adjusting the image quality parameters or by Local dimming (Local backlight technology).
Adjusting image quality parameters, which are mainly realized by adjusting image quality related parameters such as image brightness, contrast, backlight brightness and the like, but essentially LCD projection scatters light, so that the light cannot be completely shielded or blocked to dissipate heat, and a black place cannot be completely blackened, so that the effect of adjusting the image quality parameters is general; the Local Dimming adjustment mode is relatively complex in backlight control, and pixel point level control cannot be realized.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an LCD projection display device and a display method, which are intended to solve the problem of how to display an image and further how to improve the high contrast of the image.
The technical scheme of the invention is as follows:
in a first aspect, the present invention provides an LCD projection display device, comprising:
a housing;
the backlight source is arranged on the shell and used for emitting light;
the first polaroid is arranged on the shell;
the first liquid crystal layer is connected with the shell and used for controlling the transmission or shielding of light according to the brightness information of the image;
the second polaroid is arranged on the shell;
the second liquid crystal layer is connected with the shell and used for controlling the transmission or shielding of light according to the brightness value of the color signal, and the first liquid crystal layer and the second liquid crystal layer are controlled by the same polarity;
the optical filter is arranged on the shell;
the third polaroid is arranged on the shell;
the backlight source and the first polaroid are arranged oppositely, the first polaroid, the second polaroid, the optical filter and the third polaroid are distributed in sequence, the first liquid crystal layer is located between the first polaroid and the second polaroid, and the second liquid crystal layer is located between the second polaroid and the optical filter.
In one form of implementation, the first and second electrodes are,
a first drive structure and a second drive structure;
the first drive structure includes:
a first positive electrode circuit board connected to one side of the first liquid crystal layer;
the first negative electrode circuit board is connected with the other side of the first liquid crystal layer;
the second driving structure includes:
the second positive electrode circuit board is connected with one side of the second liquid crystal layer;
the second negative electrode circuit board is connected with the other side of the second liquid crystal layer;
the first positive pole circuit board, the first negative pole circuit board, the second positive pole circuit board and the second negative pole circuit board are distributed in sequence, the first negative pole circuit board is located at one side close to the second polaroid, and the second negative pole circuit board is located at one side close to the third polaroid.
In one implementation, the display device further includes:
and the control chip is connected with the first liquid crystal layer and the second liquid crystal layer and is used for acquiring image information and calculating the first group of signals and the second group of signals according to the image information.
In one implementation, the display device further includes:
the first glass substrate is connected with the first positive electrode circuit board in a laminated mode;
the second glass substrate is connected with the first negative electrode circuit board in a laminated mode;
a third glass substrate connected to the second positive electrode circuit board in a laminated manner;
and the fourth glass substrate is connected with one surface of the optical filter, which is close to the third polarizer in a laminated manner.
In one implementation, the first liquid crystal layer is a backlight control liquid crystal layer, and the second liquid crystal layer is an image display liquid crystal layer;
the backlight control liquid crystal layer is adjusted in synchronization with the image display liquid crystal layer.
In a second aspect, the present invention provides a display method of an LCD projection display device according to any one of the above, wherein the method comprises:
acquiring an image to be displayed;
determining brightness and darkness information respectively corresponding to each pixel point in the image to be displayed;
determining a first group of signals and a second group of signals corresponding to the image to be displayed according to the brightness information respectively corresponding to each pixel point; wherein the first set of signals and the second set of signals are both low voltage differential signals;
and controlling a first liquid crystal layer to transmit or shield light according to the first group of signals, and synchronously controlling a second liquid crystal layer to transmit or shield light according to the second group of signals to generate an image corresponding to the image to be displayed.
In one implementation, the brightness information corresponding to the pixel point includes a red, green and blue hierarchy for determining brightness of the pixel point in the image to be displayed; the first group of signals comprises pixel signals and a first group of luminance signals, and the second group of signals comprises a second group of luminance signals;
the determining a first group of signals and a second group of signals corresponding to the image to be displayed according to the brightness information respectively corresponding to each pixel point comprises:
determining low-voltage differential signals respectively corresponding to the pixel points according to the red, green and blue hierarchies respectively corresponding to the pixel points;
and determining a pixel signal, a first group of brightness signals and a second group of brightness signals corresponding to the image to be displayed according to the low-voltage differential signals corresponding to the pixel points.
In one implementation manner, the brightness information corresponding to the pixel point further includes a coordinate used for determining a position of the pixel point in the image to be displayed;
the determining the low-voltage differential signals respectively corresponding to the pixel points according to the red, green and blue hierarchies respectively corresponding to the pixel points comprises:
and determining the low-voltage differential signals respectively corresponding to the pixel points according to the coordinates and the red, green and blue layers respectively corresponding to the pixel points.
In one implementation, the image to be displayed comprises a first area and a second area which are adjacent; the value ranges of the first group of brightness signals and the second group of brightness signals are both 0-255;
the step of controlling the first liquid crystal layer to transmit or shield light according to the first group of signals and synchronously controlling the second liquid crystal layer to transmit or shield light according to the second group of signals to generate an image corresponding to the image to be displayed comprises the following steps:
when the first group of brightness signals and the second group of brightness signals in the first area are 0, controlling a first driving structure to apply voltage to the first liquid crystal layer so that the first liquid crystal layer completely shields light of a backlight source, and controlling a second driving structure to apply voltage to the second liquid crystal layer so that the second liquid crystal layer completely shields the light of the backlight source, and generating an image corresponding to the first area;
when the first group of luminance signals and the second group of luminance signals in the second area are 255, controlling the first driving structure to apply voltage to the first liquid crystal layer so that the first liquid crystal layer completely transmits light of the backlight source, and controlling the second driving structure to apply voltage to the second liquid crystal layer so that the second liquid crystal layer completely transmits the light of the backlight source to generate an image corresponding to the second area;
and obtaining an image corresponding to the image to be displayed according to the image corresponding to the first area and the image corresponding to the second area, so that the image corresponding to the first area and the image corresponding to the second area are not influenced by each other.
In one implementation manner, the controlling a first liquid crystal layer to transmit or shield light according to the first group of signals, and synchronously controlling a second liquid crystal layer to transmit or shield light according to the second group of signals to generate an image corresponding to the image to be displayed further includes:
when the first group of brightness signals and the second group of brightness signals in the first area are 0, controlling a first driving structure to apply voltage to the first liquid crystal layer so that the first liquid crystal layer completely shields light of a backlight source, and controlling a second driving structure to apply voltage to the second liquid crystal layer so that the second liquid crystal layer completely shields the light of the backlight source to generate an image corresponding to the first area;
and when the first group of brightness signals and the second group of brightness signals in the second area are 125, controlling the first driving structure to apply voltage to the first liquid crystal layer so that the first liquid crystal layer partially shields light of the backlight source, and controlling the second driving structure to apply voltage to the second liquid crystal layer so that the second liquid crystal layer partially shields the light of the backlight source to generate an image corresponding to the second area.
Has the beneficial effects that: the invention provides an LCD projection display device and a display method, the display device of the invention adjusts light through two liquid crystal layers, a first liquid crystal layer controls the transmission or shielding of the light according to the brightness information of an image, a second liquid crystal layer controls the transmission or shielding of the light according to the brightness value of a color signal, and the first liquid crystal layer and the second liquid crystal layer are controlled by the same polarity, thereby leading the backlight source to emit light, then the first liquid crystal layer is used for shielding the light, so that the accuracy of the light after the brightness degree of the light is shielded for the first time is improved, the accuracy of the light after the brightness degree of the light is shielded for the second time is further improved, and realizing the backlight switch of a pixel point level, leading the pixel point displayed in black to achieve the state of complete black, leading the backlight of the pixel point displayed in bright to be normally transmitted, further realizing the display image with higher contrast, and achieving the effect of improving the image contrast of adjacent areas.
Drawings
FIG. 1 is a flow chart of an LCD projection display method according to the present invention;
FIG. 2 is a schematic diagram of a projection structure of the LCD projection display device according to the present invention;
FIG. 3 is a schematic diagram of an LCD projection display device according to the present invention;
FIG. 4 is a flowchart of an image signal control process according to the present invention.
Description of reference numerals:
100-a backlight source; 200-a first liquid crystal layer; 300-a second liquid crystal layer; 311-a first polarizer; 312-a first glass substrate; 313 — a first positive electrode circuit board; 314-a first negative circuit board; 315-a second glass substrate; 320-a second polarizer; 321-a third glass substrate; 322-a second positive circuit board; 323-second negative pole circuit board; 324-a filter; 325-a fourth glass substrate; 326-third polarizer.
Detailed Description
The present invention provides an LCD projection display device and a display method, and the purpose, technical solution and effect of the present invention are clearer and clearer, and the present invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It should be further noted that the same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
The existing LCD projection mainly realizes the adjustment of the image contrast by adjusting a backlight source, or adopts a Local Dimming mode, but the backlight control is complex, the control of a pixel point level cannot be realized, and a certain space is provided for improving. Therefore, in the display scheme in the prior art, pixel point level control cannot be realized, and then higher contrast cannot be achieved, so that a user cannot see more details.
In order to solve the above problems, the present invention provides an LCD projection display device, which can make black pixels have no light transmission by controlling a first liquid crystal layer (backlight control liquid crystal layer), so as to achieve true black, thereby making the LCD projection have higher contrast and output the best projection effect; as shown in fig. 2 or 3, it includes:
a housing (not shown in the figures);
a backlight source 100 disposed in the housing for emitting light;
a first polarizer 311 disposed in the housing;
a first liquid crystal layer 200 connected to the housing for controlling light transmission or shielding according to brightness information of an image;
a second polarizer 320 disposed on the housing;
the second liquid crystal layer 300 is connected to the housing and used for controlling transmission or shielding of light according to the brightness value of the color signal, and the first liquid crystal layer and the second liquid crystal layer are controlled by the same polarity;
a filter 324 (i.e., a color filter) disposed in the housing;
a third polarizer 326 disposed on the housing;
the backlight source 100 is opposite to the first polarizer 311, the second polarizer 320, the optical filter 324 and the third polarizer 326 optical filter 324 are sequentially distributed, the first liquid crystal layer 200 is located between the first polarizer 311 and the second polarizer 320, and the second liquid crystal layer 300 is located between the second polarizer 320 and the optical filter 324.
The invention is LCD projection controlled by double liquid crystal layers, which can output 2 groups of LVDS (Low-Voltage Differential Signaling) signals through the processing of a main chip on image signals according to image information under the condition of not changing the light path layout of the original whole projection equipment, wherein one group of LVDS signals is used for image display, the other group of LVDS signals is only used for outputting brightness signals and is used for controlling a liquid crystal layer in a backlight mode, so that the backlight switch of a pixel point level is realized, the black displayed pixel points can reach the full black state, the bright displayed pixel points and the backlight normally transmit, and thus, the ultrahigh contrast is realized. Note that the first group of low voltage differential signals includes luminance information of an image, and the second group of low voltage differential signals includes luminance values of R, G, and B color signals.
It should be noted that, the brightness of the white light emitted from the backlight source 100 towards one side of the first polarizer 311 is the same, the parameters and structures of the first polarizer 311, the second polarizer 320 and the third polarizer 326 are the same (the size and the thickness are the same), the first liquid crystal layer 200 and the second liquid crystal layer 300 both include liquid crystal molecules, the orientations of the liquid crystal molecules have a certain regularity, when the two sides of the liquid crystal layer are energized, the liquid crystal layers are arranged in order, so that the light easily passes through, and when the liquid crystal layer is not energized, the arrangement is disordered, so that the light is prevented from passing through; the light transmittance or reflectivity of the liquid crystal unit can be influenced by the power supply under the on-off control, so that the transmission or shielding function of the light source is controlled, each pixel point is controlled, and images with different gray levels and colors are generated.
Taking the region of one pixel as an example, the red, green and blue regions of the whole pixel are synchronously adjusted:
when no voltage is applied to the liquid crystal layer, after the backlight source 100 emits white light, the white light is completely transmitted by the first liquid crystal layer 200 and the second liquid crystal layer 300, and passes through the optical filter 324, and red, green and blue are mixed in the same proportion, so that a white pixel point is displayed finally;
when voltage is applied to the liquid crystal layer (i.e., the same voltage is applied to the first liquid crystal layer and the second liquid crystal layer), liquid crystal molecules in the liquid crystal layer reflect a part of light, so that the light reaching the optical filter 324 is greatly reduced, thereby generating theoretical color under the condition that red, green and blue light are mixed and the proportion of the red, the green and the blue light is weaker, controlling the magnitude of the control voltage to realize the control of the arrangement of the liquid crystal molecules, and further controlling the color of the pixel points.
It should be noted that if the LCD panel wants to display black, i.e. the liquid crystal molecules of the liquid crystal layer are required to be completely spread and parallel to the polarizer to completely block the emitted backlight, but the liquid crystal molecules cannot be completely closed, i.e. when the liquid crystal molecules are maximally closed, a certain amount of light still exists, so that when an image is presented, the contrast ratio between the two regions is low, for example, when black is displayed, true black cannot be achieved, and light is slightly emitted, so that the contrast ratio with the surrounding white light is low.
In the invention, the light is adjusted by at least two liquid crystal layers, so that the backlight source 100 emits light which is shielded by the first liquid crystal layer 200 for the first time, the accuracy of the brightness degree of the light after the first shielding is improved, the light after the first shielding is continuously shielded by the second liquid crystal layer 300, the accuracy of the brightness degree of the light after the second shielding is further improved, a display image with higher contrast is realized, and the effect of improving the image contrast of adjacent regions is achieved.
In this embodiment, the first liquid crystal layer 200 is a backlight control liquid crystal layer, and the second liquid crystal layer 300 is an image display liquid crystal layer. The backlight control liquid crystal layer 200 is adjusted in synchronization with the image display liquid crystal layer 300. It should be noted that the backlight control liquid crystal layer and the image display liquid crystal layer are stacked structures in which pixels correspond to pixels one to one.
Specifically, the first liquid crystal layer 200 and the second liquid crystal layer 300 need to be adjusted synchronously, so that the rotation directions of the liquid crystal molecules opposite to each other in the two liquid crystal layers are consistent, the accuracy of the pixel brightness obtained after light passes through the liquid crystal layers is ensured, and the contrast is improved.
In the embodiment, the device further comprises a first driving structure and a second driving structure;
the first drive structure includes:
a first positive electrode circuit board 313 connected to one side (i.e., the lower side in fig. 3) of the first liquid crystal layer 200;
a first negative electrode circuit board 314 connected to the other side (i.e., the upper side in fig. 3) of the first liquid crystal layer 200;
the second driving structure includes:
a second positive electrode circuit board 322 connected to one side (i.e., the lower side in fig. 3) of the second liquid crystal layer 300;
a second negative electrode circuit board 323 connected to the other side (i.e., the upper side in fig. 3) of the second liquid crystal layer 300;
the first positive circuit board 313, the first negative circuit board 314, the second positive circuit board 322, and the second negative circuit board 323 are sequentially distributed, the first negative circuit board 314 is located at a side close to the second polarizer 320, and the second negative circuit board 323 is located at a side close to the third polarizer 326.
In this embodiment, the method further includes:
a first glass substrate 312 laminated to the first positive electrode circuit board 313;
a second glass substrate 315 laminated to the first negative electrode circuit board 314;
a third glass substrate 321 laminated and connected to the second positive electrode circuit board layer 322;
and a fourth glass substrate 325 laminated to a surface of the filter 324 adjacent to the third polarizer 326.
Specifically, as shown in fig. 3, a first polarizer 311, a first glass substrate 312, a first positive circuit board 313, a first liquid crystal layer 200, a first negative circuit board 314, a second glass substrate 315, a second polarizer 320, a third glass substrate 321, a second positive circuit board 322, a second liquid crystal layer 300, a second negative circuit board 323, an optical filter 324, a fourth glass substrate 325, and a third polarizer 326 are sequentially distributed from bottom to top, and the sizes of the sequential distributions shown in fig. 3 are the same, so that the accuracy of the brightness of light passing through the edge is ensured, and the contrast is improved.
It should be noted that the image display liquid crystal layer is consistent with the common LCD structure, the backlight control liquid crystal layer is correspondingly simplified, a color filter is not needed, and meanwhile, the double-layer liquid crystal stack can reduce the number of polarizers between two liquid crystal layers, and only 1 sheet is needed.
The backlight controls the driving of the liquid crystal layer, after image information is processed through a System On Chip (SOC) control Chip of the LCD projection main board, the brightness of each pixel point of each frame of image is obtained, if the brightness value of a certain pixel point is 0, liquid crystal molecules of the liquid crystal layer do not deflect, polarized light cannot pass through the pixel point, and then corresponding image display is black, so that the black is blacker, and the contrast of the image is improved.
After the SOC of the projection mainboard processes image information, 2 groups of LVDS signals (low voltage differential signaling) are output to respectively control the backlight control layer and the image signal layer. The LVDS signals of the image signal layer are the same as conventional projection signals, and are not described herein again, and the LVDS signals of the backlight control layer are output in 0 to 255 orders, which are obtained by calculation according to the brightness of the image. That is, when the acquired image to be displayed is to be displayed on the display device, the low voltage differential signal that is processed by the SOC and is transmitted to the image signal layer (the second liquid crystal layer 300) includes the RGB pixel signals and the first group of luminance signals, and the low voltage differential signal that is processed by the SOC and is transmitted to the backlight control layer (the first liquid crystal layer 200) is the second group of luminance signals.
It should be noted that the two groups of low-voltage differential signals are calculated by using 8-bit data bits, so the value range is 0 to 255; however, the first set of luminance signals is luminance information of an image, and the second set of luminance signals is luminance values of R, G, and B color signals.
In this embodiment, the display device further includes:
and a control Chip (i.e., SOC, system on Chip) connected to the first liquid crystal layer and the second liquid crystal layer, and configured to collect image information (including brightness information corresponding to the pixel point) and calculate the first group of signals and the second group of signals according to the image information, that is, control the first liquid crystal layer according to the first group of signals, and control the second liquid crystal layer according to the second group of signals.
It should be noted that the working principle of the LCD: the LCD projection display device is a display component which takes liquid crystal as a basic material, controls the rotation direction of liquid crystal molecules by controlling the voltage at two ends of the liquid crystal molecules, and then controls the polarized light projection degree of each pixel point to achieve the purpose of display. Currently, the LCM (LCD Module) is an LCD Module, which includes a display device (LCD), a control driver chip, a PCB, a backlight, a structural member, and a connector.
Based on the above embodiment, the present invention further provides a display method of an LCD projection display device, which is applied to the LCD projection display device and has all the beneficial effects of the above LCD projection display device, and the method comprises the following steps:
and S100, acquiring an image to be displayed.
Specifically, an image desired to be displayed is acquired, for example, the first area is bright and the second area is completely black.
And S200, determining brightness and darkness information respectively corresponding to each pixel point in the image to be displayed.
Specifically, the brightness information corresponding to the pixel point includes a red, green and blue hierarchy used for determining brightness of the pixel point in the image to be displayed and a coordinate used for determining a position of the pixel point in the image to be displayed. And acquiring image information through a control chip, wherein the image information comprises brightness information corresponding to each pixel point.
It should be noted that the liquid crystal layer is controlled by the same polarity in the present invention, and the positive and negative polarities are not required.
Furthermore, the red, green and blue levels of each pixel point are RGB values, the range is 0-255, the RGB values of each pixel point are the same, and the RGB values of each pixel point are synchronously adjusted. If the red, green and blue levels of a pixel point are determined to be (125 ) according to the image to be displayed, the red, green and blue levels of a pixel point are determined to be (0, 0), and the red, green and blue levels of a pixel point are determined to be (255 ).
Step S300, determining a first group of signals and a second group of signals corresponding to the image to be displayed according to the brightness information respectively corresponding to each pixel point.
Specifically, the control chip calculates the first set of signals and the second set of signals according to the image information, that is, controls the first liquid crystal layer according to the first set of signals and controls the second liquid crystal layer according to the second set of signals. The first set of signals and the second set of signals are both low voltage differential signals; the first group of signals includes pixel signals and a first group of luminance signals, and the second group of signals includes a second group of luminance signals. Note that the luminance signal is the value of RGB levels, such as (0, 0), (255 ).
The step S300 specifically includes:
step S310, determining low-voltage differential signals respectively corresponding to all the pixel points according to the red, green and blue hierarchies respectively corresponding to all the pixel points;
step S320, determining a pixel signal, a first group of brightness signals and a second group of brightness signals corresponding to the image to be displayed according to the low-voltage differential signals corresponding to the pixel points; the value ranges of the first group of brightness signals and the second group of brightness signals are both 0-255.
Specifically, the first group of luminance signals is the same as the second group of luminance signals, and when the red, green and blue levels of a pixel are (125 ), the low voltage differential signal output of the pixel is (125 ); when the red, green and blue levels of a pixel point are (0, 0), the low-voltage differential signal output of the pixel point is (0, 0); when the red, green and blue levels of a pixel point are (255, 255 and 255), the low-voltage differential signals of the pixel point are output as (255, 255 and 255), and therefore the low-voltage differential signals of the pixel points are collected to obtain a first group of brightness signals and a second group of brightness signals.
In one implementation, the step S310 specifically includes:
step S311, determining the low voltage differential signals respectively corresponding to each pixel point according to the coordinates and the red, green, and blue levels respectively corresponding to each pixel point.
And S400, controlling a first liquid crystal layer to transmit or shield light according to the first group of signals, and synchronously controlling a second liquid crystal layer to transmit or shield light according to the second group of signals to generate an image corresponding to the image to be displayed.
Specifically, the image to be displayed includes a first region and a second region which are adjacent to each other.
It should be noted that, when the luminance signal is 0, the liquid crystal layer cannot transmit the light of the backlight source; when the brightness signal is 255, the liquid crystal layer completely transmits the backlight light; when the brightness signal is at other values (e.g. 125), the liquid crystal can be in a corresponding deflection state by applying corresponding voltages, so that the brightness of the backlight source is controlled, and further the brightness is accurately controlled.
The step S400 specifically includes:
step S410, when the first group of luminance signals and the second group of luminance signals in the first area are 0, controlling a first driving structure to apply a voltage to the first liquid crystal layer, so that the first liquid crystal layer completely shields light of a backlight source, and controlling a second driving structure to apply a voltage to the second liquid crystal layer, so that the second liquid crystal layer completely shields light of the backlight source, and generating an image corresponding to the first area;
step S420, when the first group of luminance signals and the second group of luminance signals in the second area are 255, controlling a first driving structure to apply a voltage to the first liquid crystal layer, so that the first liquid crystal layer completely transmits light of the backlight source, and controlling a second driving structure to apply a voltage to the second liquid crystal layer, so that the second liquid crystal layer completely transmits light of the backlight source, and generating an image corresponding to the second area; or
When the first group of brightness signals and the second group of brightness signals in the second area are 125, controlling the first driving structure to apply voltage to the first liquid crystal layer so that the first liquid crystal layer partially shields light of a backlight source, and controlling the second driving structure to apply voltage to the second liquid crystal layer so that the second liquid crystal layer partially shields light of the backlight source, so as to generate an image corresponding to the second area;
step S430, obtaining an image corresponding to the image to be displayed according to the image corresponding to the first area and the image corresponding to the second area, so that the image corresponding to the first area and the image corresponding to the second area do not affect each other.
It should be noted that two groups of different luminance signals may be any values from 0 to 255, so that an image corresponding to an image to be displayed is determined through the obtained images corresponding to the two regions, the coordination between the two regions of the image is ensured, and the image contrast of the two regions is improved.
In summary, the present invention provides an LCD projection display device and a display method, in which light is adjusted by two liquid crystal layers, so that the light emitted from a backlight source is first shielded by a first liquid crystal layer, so that the accuracy of the brightness of the light after being shielded for one time is improved, the light after being first shielded continues to be shielded by a second liquid crystal layer, so that the accuracy of the brightness of the light after being shielded for the second time is further improved, and a pixel-level backlight switch is implemented, so that a black-displayed pixel can reach a completely black state, and the backlight of the bright-displayed pixel normally transmits, thereby implementing a display image with higher contrast, and achieving an effect of improving the contrast of an image in an adjacent region.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. An LCD projection display device, comprising:
a housing;
the backlight source is arranged on the shell and used for emitting light;
the first polaroid is arranged on the shell;
the first liquid crystal layer is connected with the shell and used for controlling the transmission or shielding of light according to the brightness information of the image;
the second polaroid is arranged on the shell;
the second liquid crystal layer is connected with the shell and used for controlling the transmission or shielding of light according to the brightness value of the color signal, and the first liquid crystal layer and the second liquid crystal layer are controlled by the same polarity;
the optical filter is arranged on the shell;
the third polaroid is arranged on the shell;
the backlight source and the first polaroid are arranged oppositely, the first polaroid, the second polaroid, the optical filter and the third polaroid are distributed in sequence, the first liquid crystal layer is located between the first polaroid and the second polaroid, and the second liquid crystal layer is located between the second polaroid and the optical filter.
2. The LCD projection display device of claim 1, further comprising:
a first drive structure and a second drive structure;
the first drive structure includes:
the first positive electrode circuit board is connected with one side of the first liquid crystal layer;
the first negative electrode circuit board is connected with the other side of the first liquid crystal layer;
the second driving structure includes:
the second positive circuit board is connected with one side of the second liquid crystal layer;
the second negative electrode circuit board is connected with the other side of the second liquid crystal layer;
the first positive circuit board, the first negative circuit board, the second positive circuit board and the second negative circuit board are distributed in sequence, the first negative circuit board is located near one side of the second polaroid, and the second negative circuit board is located near one side of the third polaroid.
3. An LCD projection display device according to claim 2, characterized in that the display device further comprises:
and the control chip is connected with the first liquid crystal layer and the second liquid crystal layer and is used for acquiring image information and calculating the first group of signals and the second group of signals according to the image information.
4. An LCD projection display device according to claim 2, characterized in that the display device further comprises:
the first glass substrate is connected with the first positive electrode circuit board in a laminated mode;
the second glass substrate is connected with the first negative electrode circuit board in a laminated mode;
a third glass substrate connected to the second positive electrode circuit board in a stacked manner;
and the fourth glass substrate is connected with one surface of the optical filter, which is close to the third polarizer in a laminated manner.
5. An LCD projection display device as claimed in claim 2, characterized in that the first liquid crystal layer is a backlight control liquid crystal layer and the second liquid crystal layer is an image display liquid crystal layer;
the backlight control liquid crystal layer is adjusted in synchronization with the image display liquid crystal layer.
6. A display method of an LCD projection display device according to any of claims 1 to 5, characterized in that the method comprises:
acquiring an image to be displayed;
determining brightness and darkness information respectively corresponding to each pixel point in the image to be displayed;
determining a first group of signals and a second group of signals corresponding to the image to be displayed according to the brightness information respectively corresponding to each pixel point; wherein the first set of signals and the second set of signals are both low voltage differential signals;
and controlling a first liquid crystal layer to transmit or shield light according to the first group of signals, and synchronously controlling a second liquid crystal layer to transmit or shield light according to the second group of signals to generate an image corresponding to the image to be displayed.
7. The display method of the LCD projection display device of claim 6, wherein the brightness information corresponding to the pixel point comprises a red, green and blue hierarchy for determining brightness of the pixel point in the image to be displayed; the first group of signals comprises pixel signals and a first group of luminance signals, and the second group of signals comprises a second group of luminance signals;
the determining a first group of signals and a second group of signals corresponding to the image to be displayed according to the brightness information respectively corresponding to each pixel point comprises:
determining low-voltage differential signals respectively corresponding to the pixel points according to the red, green and blue hierarchies respectively corresponding to the pixel points;
and determining a pixel signal, a first group of brightness signals and a second group of brightness signals corresponding to the image to be displayed according to the low-voltage differential signals corresponding to the pixel points.
8. The display method of the LCD projection display device according to claim 7, wherein the light and dark information corresponding to the pixel point further includes coordinates for determining the position of the pixel point in the image to be displayed;
the determining the low-voltage differential signals respectively corresponding to the pixel points according to the red, green and blue hierarchies respectively corresponding to the pixel points comprises:
and determining the low-voltage differential signals respectively corresponding to the pixel points according to the coordinates and the red, green and blue layers respectively corresponding to the pixel points.
9. The display method of the LCD projection display device according to claim 7, wherein the image to be displayed includes a first region and a second region adjacent to each other; the value ranges of the first group of brightness signals and the second group of brightness signals are both 0 to 255;
the step of controlling the first liquid crystal layer to transmit or shield light according to the first group of signals and synchronously controlling the second liquid crystal layer to transmit or shield light according to the second group of signals to generate an image corresponding to the image to be displayed includes:
when the first group of brightness signals and the second group of brightness signals in the first area are 0, controlling a first driving structure to apply voltage to the first liquid crystal layer so that the first liquid crystal layer completely shields light of a backlight source, and controlling a second driving structure to apply voltage to the second liquid crystal layer so that the second liquid crystal layer completely shields the light of the backlight source, and generating an image corresponding to the first area;
when the first group of luminance signals and the second group of luminance signals in the second area are 255, controlling the first driving structure to apply voltage to the first liquid crystal layer so that the first liquid crystal layer completely transmits light of the backlight source, and controlling the second driving structure to apply voltage to the second liquid crystal layer so that the second liquid crystal layer completely transmits the light of the backlight source to generate an image corresponding to the second area;
and obtaining an image corresponding to the image to be displayed according to the image corresponding to the first area and the image corresponding to the second area, so that the image corresponding to the first area and the image corresponding to the second area are not influenced by each other.
10. The method as claimed in claim 7, wherein the step of controlling the first liquid crystal layer to transmit or shield light according to the first set of signals and synchronously controlling the second liquid crystal layer to transmit or shield light according to the second set of signals to generate the image corresponding to the image to be displayed further comprises:
when the first group of brightness signals and the second group of brightness signals in the first area are 0, controlling a first driving structure to apply voltage to the first liquid crystal layer so that the first liquid crystal layer completely shields light of a backlight source, and controlling a second driving structure to apply voltage to the second liquid crystal layer so that the second liquid crystal layer completely shields the light of the backlight source to generate an image corresponding to the first area;
and when the first group of brightness signals and the second group of brightness signals in the second area are 125, controlling the first driving structure to apply voltage to the first liquid crystal layer so that the first liquid crystal layer partially shields light of the backlight source, and controlling the second driving structure to apply voltage to the second liquid crystal layer so that the second liquid crystal layer partially shields the light of the backlight source to generate an image corresponding to the second area.
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| CN202211302755.8A CN115903318A (en) | 2022-10-24 | 2022-10-24 | LCD projection display device and display method |
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