CN116047813A - High-contrast display device and display system - Google Patents
High-contrast display device and display system Download PDFInfo
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- CN116047813A CN116047813A CN202310321251.9A CN202310321251A CN116047813A CN 116047813 A CN116047813 A CN 116047813A CN 202310321251 A CN202310321251 A CN 202310321251A CN 116047813 A CN116047813 A CN 116047813A
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- liquid crystal
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention provides a high-contrast display device which is applied to the technical field of liquid crystal screens and sequentially comprises a first liquid crystal layer, a first optical film group, a first LED lamp panel, a driving piece, a second liquid crystal layer, a second optical film group and a second LED lamp panel from top to bottom, wherein the driving piece is connected with the first LED lamp panel in series and is used for driving the first LED lamp panel, the second liquid crystal layer plays a role of a liquid crystal light valve, and the first liquid crystal layer is used for displaying images. The high-contrast display system is realized by using the high-contrast display device, and further comprises a main control module for receiving and processing the image electric signals and then sending corresponding signals to the first liquid crystal layer, the first LED lamp panel, the second liquid crystal layer and the second LED lamp panel. The first LED lamp panel is driven by the induction characteristic of the driving piece, and the first LED lamp panel is driven to emit light by using smaller power so as to provide backlight for the first liquid crystal layer, so that the contrast ratio of the display device is improved.
Description
Technical Field
The invention belongs to the technical field of liquid crystal screens, and particularly relates to a high-contrast display device and a high-contrast display system.
Background
The liquid crystal screen is characterized in that a liquid crystal material is used as a basic component, the liquid crystal material is filled between two parallel plates, the arrangement condition of molecules in the liquid crystal material is changed through voltage, the purposes of shading and transmitting light are achieved, images with different depths are displayed, and color images can be displayed only by adding a light filtering layer with three primary colors between the two plates.
Since the liquid crystal itself cannot actively emit light, a backlight is required to be externally provided to display an image. At present, when a liquid crystal image is a black field, liquid crystal molecules cannot be completely closed, and most light penetrates through the liquid crystal molecules, so that the contrast of the existing liquid crystal display is poor.
In order to solve the above problems, there are three schemes:
1. the processing technology of the liquid crystal is improved to improve the contrast ratio, and the scheme has the defects that: the contrast ratio of the liquid crystal manufactured by the prior mature process is basically within 4000:1, and the contrast ratio is still not high;
2. the MINI-LED is used as a backlight source to carry out partition control on the lamp beads of the LED lamp panel, and the contrast ratio of a liquid crystal picture is improved through a software algorithm, so that the defects are that: the algorithm is complex, the number of the partitions is small, the control of tens of thousands of partitions cannot be realized, even if the control of tens of thousands of partitions can be performed, the production cost is high, and the market cannot digest;
3. the two liquid crystal layers are directly attached, the first liquid crystal layer inside plays a role of a liquid crystal light valve, the luminous flux is regulated, the second liquid crystal layer outside plays a role of image display, and the scheme has the defects that: the power consumption is large, and the light transmittance of the first liquid crystal layer is only 30% at most and the light transmittance of the second liquid crystal layer is only 4% -5% because the first liquid crystal layer plays a role of a light valve.
Accordingly, there is a need to improve the structure of the display device, thereby reducing power consumption while improving contrast.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a high-contrast display device, in which backlight is provided to a second liquid crystal layer by an LED lamp panel, and the light-sensing characteristic of a light-sensing element is utilized to drive a light bead on the first LED lamp panel to emit light by a smaller power, so as to provide backlight to the first liquid crystal layer, thereby improving the contrast of the display device by a lower power.
The utility model provides a display device of high contrast, includes module one and module two, module two includes:
the LED lamp panel II is used for providing backlight for the liquid crystal layer II;
the second optical film group is positioned above the second LED lamp panel and is used for carrying out diffusion shaping on the light signals emitted by the second LED lamp panel;
the second liquid crystal layer is positioned above the second optical film group and is used for turning over liquid crystal molecules at corresponding positions according to the image electric signals to play a role of a liquid crystal light valve;
the first module comprises:
the LED lamp panel I is positioned above the liquid crystal layer II and used for providing backlight for the liquid crystal layer I; the driving piece is arranged on the first LED lamp panel and used for driving the lamp beads on the first LED lamp panel to emit light;
the first optical film group is positioned above the first LED lamp panel and is used for performing diffusion shaping on the light signals emitted by the first LED lamp panel;
and the liquid crystal layer I is positioned above the optical film group I and is used for displaying images.
In order to realize synchronous display, the driving signals of the first liquid crystal layer and the second liquid crystal layer are synchronous signals, and the driving signals of the first LED lamp panel and the second LED lamp panel are synchronous signals.
In order to drive the first LED lamp panel through the low-power signal, the driving piece is a light sensing element and is positioned between the first LED lamp panel and the second liquid crystal layer, and light signals which penetrate through the second liquid crystal layer at corresponding positions can be sensed and conducted.
In order to enable the driving piece to drive the first LED lamp panel, the first LED lamp panel comprises at least one lamp bead, one light sensing element corresponds to one or more lamp beads on the first LED lamp panel, the light sensing element is connected with the lamp beads at the corresponding positions in series, and when a light signal sensed by the light sensing element becomes strong, the current passing through the light sensing element becomes large, so that the brightness of the lamp beads at the corresponding positions on the first LED lamp panel becomes large.
The light sensing element is electrically connected with the constant current circuit.
In order to synchronize the driving member with the image signal, the reaction time of the driving member is smaller than the inversion time of the liquid crystal molecules in the first liquid crystal layer and the second liquid crystal layer.
The second object of the present invention is to provide a high-contrast display system, which is implemented by using the high-contrast display device, and further includes a main control module, wherein the main control module receives and processes the image electric signal, and then sends corresponding signals to the first liquid crystal layer, the first LED lamp panel, the second liquid crystal layer and the second LED lamp panel.
The main control module comprises an FPGA chip and an SOC chip.
The master control module transmits synchronous TCON signals to the first liquid crystal layer and the second liquid crystal layer, and transmits synchronous PWM signals to the first LED lamp panel and the second LED lamp panel.
The beneficial effects of the invention are as follows: according to the high-contrast display device and the high-contrast display system, the LED lamp panel II emits light signals to provide backlight for the liquid crystal layer II, the liquid crystal molecules at the corresponding positions of the liquid crystal layer II are turned over according to the image signals to play a role of a light valve, light transmitted through the liquid crystal layer II at the corresponding positions is sensed through the photosensitive characteristics of the photosensitive elements, the lamp beads on the LED lamp panel I at the corresponding positions are driven to emit corresponding light signals, and the liquid crystal layer I is enabled to turn over the liquid crystal molecules at the corresponding positions according to the image signals to display images. The contrast ratio of the display device is improved by virtue of the structure of the double liquid crystal layers, so that a dark area is darker, a bright area is brighter, and the energy consumption of the display device is reduced by driving the LED lamp panel I to provide backlight for the liquid crystal layer I through the light sensitive element with low power consumption.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a display device according to the present invention;
FIG. 2 is an enlarged view of the display device of the present invention at A in the schematic structural view of FIG. 1;
FIG. 3 is a schematic diagram of the circuit connection between a first light bead and a corresponding light sensing element of an LED light panel of the display device of the present invention;
FIG. 4 is a diagram showing the correspondence between the second LED lamp panel, the first LED lamp panel and the light sensing element in the first embodiment of the present invention;
fig. 5 is a functional block diagram of a display system of the present invention.
Marked in the figure as: 1. a first liquid crystal layer; 2. an optical film I; 3. an optical film II; 4. an LED lamp panel I; 5. a second liquid crystal layer; 6. an optical film III; 7. an optical film fourth; 8. an LED lamp panel II; 9. a light-sensitive element; 10. and a constant current circuit.
Detailed Description
Example 1
As shown in fig. 1, a display device with high contrast ratio includes, from top to bottom, a first liquid crystal layer 1, a first optical film set, a first LED lamp panel 4, a second liquid crystal layer 5, a second optical film set, and a second LED lamp panel 8, wherein a driving element is mounted on the first LED lamp panel 4, and the driving element may be a light sensing element 9, or may be an inductance element, a magnetic sensing element, or the like; the first optical film group and the second optical film group comprise optical films, and the optical films can be light guide films, diffusion films and the like; the number of optical films may be one or more.
As shown in fig. 1, specifically, the second LED lamp panel 8 is configured to provide backlight to the second liquid crystal layer 5.
The second optical film group comprises a third optical film 6 and a fourth optical film 7, and is used for performing diffusion shaping on the light signals emitted by the second LED lamp panel 8 so as to enable uniform light signals to be projected onto the second liquid crystal layer 5;
the second liquid crystal layer 5 is used for turning over liquid crystal molecules at corresponding positions according to the image electric signals, and plays a role of a liquid crystal light valve, so that light emitted by the lamp beads at corresponding positions of the second LED lamp panel 8 is projected onto the light sensing element 9 at corresponding positions through the second liquid crystal layer 5.
The LED lamp panel I4 is used for providing a light source for the liquid crystal layer I1.
As shown in fig. 2 and 3, the first LED lamp panel 4 includes at least one lamp bead, the lamp bead is connected in series with the light sensing element 9, one light sensing element 9 corresponds to one or more lamp beads, the light sensing element 9 is located between the first LED lamp panel 4 and the second liquid crystal layer 5, and the light sensing element 9 faces the second liquid crystal layer 5, so as to facilitate sensing light transmitted through the second liquid crystal layer 5.
The light sensing element 9 can be a photoresistor, a photosemiconductor, a photodiode, a phototriode and the like, the model of the light sensing element 9 can be BPT-BP0934, and the light sensing element 9 is electrically connected with the constant current circuit 10, can sense and conduct the light signal transmitted through the liquid crystal layer two 5 and is used for driving the lamp beads on the LED lamp panel one 4 to emit light, when the light signal sensed by the light sensing element 9 is strong, the current passing through the light sensing element 9 is large, and the brightness of the lamp beads corresponding to the light sensing element 9 connected in series on the LED lamp panel one 4 is large; when the light signal induced by the light sensing element 9 becomes weak, the current passing through the light sensing element 9 becomes small, and the brightness of the corresponding lamp bead connected in series with the light sensing element 9 on the first LED lamp panel 4 becomes small, so that the contrast of the image displayed on the first liquid crystal layer 1 can be higher, that is, the dark area is darker, and the bright area is brighter.
As shown in fig. 1, the first optical film group includes a first optical film 2 and a second optical film 3, which are used for performing diffusion shaping on the light signal emitted by the first LED lamp panel 4, so that a uniform light signal is projected onto the first liquid crystal layer 1.
As shown in fig. 1, the first liquid crystal layer 1 is used for displaying an image, and the first liquid crystal layer 1 turns over liquid crystal molecules at corresponding positions according to image signals, so that light emitted by the lamp beads at corresponding positions on the first LED lamp panel 4 is transmitted, and image display is realized.
As shown in fig. 1 to 4, the second LED lamp panel 8 provides backlight to the second liquid crystal layer 5, the third optical film 6 and the fourth optical film 7 diffuse and shape light, so that uniform light signals are projected onto the second liquid crystal layer 5, and the second liquid crystal layer 5 turns over liquid crystal molecules at corresponding positions according to image signals to play a role of a liquid crystal light valve; the light sensing element 9 at the corresponding position senses the light transmitted through the LED lamp panel II 8 and then is conducted, so that the lamp beads at the corresponding position of the LED lamp panel I4 emit light through current, backlight is provided for the liquid crystal layer I1, the optical film I2 and the optical film II 3 diffuse and shape the light, uniform light signals are projected onto the liquid crystal layer I1, and corresponding liquid crystal molecules in the liquid crystal layer I1 are turned by corresponding angles according to image signals, so that image display is realized.
Since the liquid crystal scans line by line, the image is displayed line by line, the response time of the light sensing element 9 is very fast, belongs to the nanosecond level, and the turn-over time of the liquid crystal molecules belongs to the millisecond level, the response time of the light sensing element 9 is far faster than the turn-over time of the liquid crystal molecules in the liquid crystal layer 1 and the liquid crystal layer 5, and therefore the light sensing element 9 can realize the photosensitive response in the turn-over time of the liquid crystal molecules in the liquid crystal layer 1 and the liquid crystal layer 5, and therefore, the synchronization of the image signals can be achieved visually by human eyes.
Specifically, the light sensing element 9 senses the change of the image signal of each line row by row, and compared with the prior art, more partition control can be realized, so that the light emitting of the lamp beads on the LED lamp panel I4 is controlled more carefully, the high partition control is realized, and the image display effect is improved.
In addition, by supplying a low-power signal to the light sensing element 9 to drive the lamp beads on the first LED lamp panel 4 to emit light, the power consumption of the display device can be effectively reduced.
The driving signals of the first liquid crystal layer 1 and the second liquid crystal layer 5 are synchronous signals, and the driving signals of the first LED lamp panel 4 and the second LED lamp panel 8 are synchronous signals.
In a normal light environment, if the brightness of an image visible to naked eyes is 500nit, in a display device formed by directly bonding two liquid crystal layers in the prior art, since the transmittance of a first liquid crystal layer is 30% and the transmittance of a second liquid crystal layer is 4%, the brightness required to be provided by a backlight source is 500 nit/(4%. Times.30%)
41667nit。
The light sensing element 9 in the display device in the application works normally, the required brightness is 70-100nit, and the maximum brightness required to be input by the LED lamp panel II 8 is 100nit/30% because the light transmittance of the liquid crystal layer II 5 is 30 percent
333nit; since the transmittance of the first liquid crystal layer 1 is 4%, the light to be output by the first LED panel 4 is 500/4% =12500 nit. The brightness of the input light required by the display device is the sum of the brightness required by the first LED lamp panel 4 and the second LED lamp panel 8, namely, 333nit+12500nit= 12833nit.
In summary, when the brightness of the output light is 500nit, the brightness of the display device with the dual-liquid crystal structure in the prior art is about 41667nit, and the brightness of the display device in the application is about 12833nit, which is only 30% of the brightness of the display device in the prior art, that is, the application can not only improve the contrast ratio of the display image and realize high-partition control, but also save about 70% of power consumption compared with the prior art.
Example two
As shown in fig. 5, in a second aspect of the present invention, a high-contrast display system is provided, which is implemented using the high-contrast display device, and further includes a main control module, where the main control module receives and processes an image electric signal, and then sends corresponding signals to the first liquid crystal layer 1, the first LED lamp panel 4, the second liquid crystal layer 5, and the second LED lamp panel 8, and specifically, the main control module includes an FPGA chip and an SOC chip.
The SOC chip transmits synchronous TCON signals or LVDS signals, EDP signals and VBYONE signals to the first liquid crystal layer 1 and the second liquid crystal layer 5; the processing capacity of the main control module can be improved by increasing the number of the SOC chips.
The FPGA chip transmits synchronous PWM signals to the first LED lamp panel 4 and the second LED lamp panel 8, and the PWM signals are used for adjusting the overall brightness of light emitted by the first LED lamp panel 4 and the second LED lamp panel 8.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a display device of high contrast, its characterized in that includes first and second of module, second of module includes:
the LED lamp panel II (8) is used for providing backlight for the liquid crystal layer II (5);
the second optical film group is positioned above the second LED lamp panel (8) and is used for carrying out diffusion shaping on the light signals emitted by the second LED lamp panel (8);
the second liquid crystal layer (5) is positioned above the second optical film group and is used for turning over liquid crystal molecules at corresponding positions according to the image electric signals to play a role of a liquid crystal light valve;
the first module comprises:
the LED lamp panel I (4) is positioned above the liquid crystal layer II (5) and is used for providing backlight for the liquid crystal layer I (1); the LED lamp panel I (4) is provided with a driving piece, and the driving piece is used for driving the lamp beads on the LED lamp panel I (4) to emit light;
the first optical film group is positioned above the first LED lamp panel (4) and is used for performing diffusion shaping on the light signals emitted by the first LED lamp panel (4);
and the liquid crystal layer I (1) is positioned above the optical film group I and is used for displaying images.
2. The high contrast display device according to claim 1, wherein the driving signals of the first liquid crystal layer (1) and the second liquid crystal layer (5) are synchronous signals, and the driving signals of the first LED lamp panel (4) and the second LED lamp panel (8) are synchronous signals.
3. The high-contrast display device according to claim 1, wherein the driving element is a light sensing element (9), and is located between the first LED lamp panel (4) and the second liquid crystal layer (5), and is capable of sensing and conducting the light signal transmitted through the second liquid crystal layer (5) at the corresponding position.
4. A high contrast display device according to claim 3, wherein the first LED light panel (4) comprises at least one light bead, one light sensing element (9) corresponds to one or more light beads on the first LED light panel (4), the light sensing element (9) is connected in series with the light bead at the corresponding position, and when the light signal induced by the light sensing element (9) becomes strong, the current passing through the light sensing element (9) becomes large, so that the brightness of the light bead at the corresponding position on the first LED light panel (4) becomes large.
5. The high contrast display device according to claim 4, wherein the light sensing element (9) is electrically connected to a constant current circuit (10).
6. The high contrast display device according to claim 1, wherein the reaction time of the driving member is less than the inversion time of the liquid crystal molecules in the first liquid crystal layer (1) and the second liquid crystal layer (5).
7. A high contrast display system implemented using the high contrast display device according to any one of claims 1 to 6, further comprising a main control module, wherein the main control module receives and processes the image electric signal, and then sends corresponding signals to the first liquid crystal layer (1), the first LED lamp panel (4), the second liquid crystal layer (5), and the second LED lamp panel (8).
8. The high contrast display system of claim 7, wherein the master control module comprises an FPGA chip, an SOC chip.
9. The high contrast display system of claim 7, wherein the master control module transmits synchronous TCON signals to the first liquid crystal layer (1) and the second liquid crystal layer (5), and the master control module transmits synchronous PWM signals to the first LED lamp panel (4) and the second LED lamp panel (8).
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| CN202310321251.9A CN116047813B (en) | 2023-03-29 | 2023-03-29 | High-contrast display device and display system |
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| CN202310321251.9A CN116047813B (en) | 2023-03-29 | 2023-03-29 | High-contrast display device and display system |
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| CN116047813B CN116047813B (en) | 2023-06-06 |
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| CN116047813B (en) | 2023-06-06 |
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