CN213904903U - Brightness adjusting circuit, liquid crystal module and display device - Google Patents
Brightness adjusting circuit, liquid crystal module and display device Download PDFInfo
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- CN213904903U CN213904903U CN202023163802.4U CN202023163802U CN213904903U CN 213904903 U CN213904903 U CN 213904903U CN 202023163802 U CN202023163802 U CN 202023163802U CN 213904903 U CN213904903 U CN 213904903U
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Abstract
Disclosed are a brightness adjusting circuit, a display module and a display device, the brightness adjusting circuit includes: a first transistor outputting a first drain signal; a second transistor outputting a second drain signal; the first comparator is used for receiving the standard voltage at a first input end, receiving a first drain electrode signal at a second input end and outputting a first comparison signal at an output end; the first input end of the second comparator receives the second drain signal, the second input end of the second comparator receives the standard voltage, and the output end of the second comparator outputs a second comparison signal; a third comparator, wherein the first input end receives the first drain signal, the second input end receives the second drain signal, and the output end outputs a third comparison signal; and the judging unit is used for receiving the first comparison signal and the third comparison signal and outputting a fourth comparison signal, the driving chip outputs a first control signal according to the fourth comparison signal, the driving chip outputs a second control signal according to the second comparison signal, and the display panel is switched to the display mode according to the first control signal and the second control signal.
Description
Technical Field
The utility model relates to a show technical field, in particular to brightness control circuit, liquid crystal module and display device.
Background
The liquid crystal display has low power consumption, small size, light weight, ultra-thin screen and other advantages, and may be used widely in various fields, such as vehicle rearview mirror of automobile.
In the process of driving and converging of an automobile, due to the existence of a display screen or a mirror surface and the like, the sight lines of a driver and passengers are influenced by the glare of opposite, lateral or rear incoming vehicles, the driving safety hidden danger is seriously caused, the riding experience of the passengers is influenced by the glare generated by the irradiation of external light, the driver cannot notice the road condition, and accidents are easily caused particularly when the automobile is driven at night, so that the automobile is very dangerous.
Fig. 1 shows a schematic diagram of a simulation of a front vehicle receiving light during driving in the prior art, as shown in fig. 1, when a rear vehicle 10 is driven at night, a front lamp 15 is turned on, light of the front vehicle shines onto a rear view mirror 21 in the vehicle from a rear window of the front vehicle 20, external ambient light (street lamp light and the like) shines onto the rear view mirror 21 of the front vehicle 20, the light of the rear vehicle 10 reflects off the rear view mirror 21, so that the sight of a driver is disturbed, the rear view mirror 21 cannot be adjusted correspondingly, and potential safety hazards are easily caused.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the present invention is to provide a brightness adjusting circuit connected to a driving chip, the brightness adjusting circuit including:
a first transistor including a gate, a source, and a drain, the first transistor outputting a first drain signal from the drain of the first transistor after being irradiated with light;
a second transistor including a gate, a source, and a drain, the second transistor outputting a second drain signal from the drain of the second transistor after being irradiated with light, and the gate and the source of the first transistor being connected to the gate and the source of the second transistor, respectively;
a first comparator, wherein a first input end receives a standard voltage, a second input end receives the first drain signal, and an output end outputs a first comparison signal;
a second comparator, wherein a first input end receives the second drain signal, a second input end receives the standard voltage, and an output end is connected with the driving chip and outputs a second comparison signal;
a third comparator, wherein the first input end receives the first drain signal, the second input end receives the second drain signal, and the output end outputs a third comparison signal;
a judging unit for receiving the first comparison signal and the third comparison signal, connecting the driving chip and outputting a fourth comparison signal,
the driving chip outputs a first control signal according to the fourth comparison signal; and the driving chip outputs a second control signal according to the second comparison signal.
Preferably, the judging unit includes:
a third transistor including a gate, a source and a drain, the gate of the third transistor being connected to the output terminal of the first comparator and receiving the first comparison signal, and the source of the third transistor receiving the third comparison signal; and
and a fourth comparator, wherein the first input end of the fourth comparator is connected with the drain electrode of the third transistor, the second input end of the fourth comparator is grounded, and the output end of the fourth comparator is connected with the driving chip and outputs a fourth comparison signal.
Preferably, the driving chip is connected between the brightness adjusting circuit and a display panel, the display panel displays a black picture according to the first control signal, and the display panel displays a mirror surface according to the second control signal.
Preferably, the first comparison signal is at a high level, the third comparison signal is at a high level, the fourth comparison signal is at a high level, and the first control signal is an active signal.
According to the utility model discloses in the second aspect, a brightness control circuit is provided, be connected to on the drive chip, include:
a first transistor including a gate, a source, and a drain, the first transistor outputting a first drain signal from the drain of the first transistor after being irradiated with light;
a second transistor including a gate, a source, and a drain, the second transistor outputting a second drain signal from the drain of the second transistor after being irradiated with light, and the gate and the source of the first transistor being connected to the gate and the source of the second transistor, respectively;
a first comparator, wherein a first input end receives the first drain signal, a second input end receives a standard voltage, and an output end is connected with the driving chip and outputs a first comparison signal;
a second comparator, the first input end of which receives the standard voltage, the second input end of which receives the second drain signal, the output end of which is connected with the driving chip and outputs a second comparison signal,
the driving chip outputs a first control signal according to the first comparison signal; and the driving chip outputs a second control signal according to the second comparison signal.
Preferably, the driving chip is connected between the brightness adjusting circuit and the display panel, the first comparison signal is at a high level, and the first control signal is an active signal; the second comparison signal is at a high level, and the second control signal is an active signal.
According to the utility model discloses the third aspect provides a liquid crystal display module assembly for realize above-mentioned luminance control circuit, include:
a first glass substrate;
a first transistor and a second transistor on a surface of the first glass substrate;
a second glass substrate located over the first transistor and the second transistor;
the black matrix is positioned on the surface of the second glass substrate facing the first glass substrate;
a protective layer covering the black matrix and the second glass substrate;
a layer of liquid crystal molecules located between the protective layer and the first transistor,
the first transistor and the second transistor receive light by a grating between the black matrices above them.
According to the utility model discloses a fourth aspect provides a display device, include:
the display panel displays pictures with different brightness according to different backlight brightness, the display panel comprises a plurality of brightness adjusting circuits, and each brightness adjusting circuit controls the brightness of the display panel in one area.
Preferably, a plurality of the brightness adjusting circuits are arranged in a non-display area of the display panel, and each brightness adjusting circuit correspondingly controls the brightness of a plurality of rows or columns of pixel units.
Preferably, a plurality of the brightness adjusting circuits are disposed in a display area of the display panel, the display area includes a plurality of areas, and one brightness adjusting circuit is disposed in each area.
The utility model provides a brightness control circuit, display module assembly and display device, including first transistor and second transistor, first transistor receives illumination back from the first drain electrode signal of drain electrode output, the second transistor receives illumination back from drain electrode output second drain electrode signal, when first comparison signal is greater than the specified value, the light from first direction is received to the first transistor of sign, make display panel adjust to first mode, when second comparison signal is greater than the specified value, the light from the second direction is received to the second transistor of sign, make display panel adjust to the second mode. Therefore, the direction of light can be identified according to the voltage output by the first transistor and the second transistor, so that the brightness of the display panel is adjusted, the interference of external light is reduced, and the glare is reduced.
Furthermore, the brightness adjusting circuit is manufactured in the display device, and the display device can be installed in a vehicle and used as a vehicle-mounted rearview mirror, a window glass, a display screen and the like, so that the influence of other vehicles on the vehicle in the driving process is reduced, and the safety coefficient is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 shows a simulation diagram of light received by a front vehicle during driving in the prior art.
Fig. 2 shows a schematic circuit diagram of a brightness adjusting circuit according to a first embodiment of the present invention.
Fig. 3a and fig. 3b respectively show the structural schematic diagram of the liquid crystal module corresponding to the brightness adjusting circuit according to the first embodiment of the present invention under different illumination angles.
Fig. 4 shows a schematic circuit diagram of a brightness adjusting circuit according to a second embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a liquid crystal module corresponding to the brightness adjusting circuit according to the second embodiment of the present invention.
Fig. 6a and 6b are schematic diagrams showing simple structures of display devices according to a third embodiment and a fourth embodiment of the present invention, respectively.
Fig. 7a and 7b show a simple structure schematic diagram of a vehicle according to a fifth embodiment and a sixth embodiment of the present invention, respectively.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
It will be understood that when an element is referred to as being "coupled" or "connected" to another element, it can be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present. Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to". The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Example one
Fig. 2 shows a schematic circuit diagram of a brightness adjusting circuit according to a first embodiment of the present invention.
For avoiding the influence of driving in-process back car light to the front car, this embodiment provides a brightness control circuit, sets up in display device, can distinguish the light that comes from different directions to in time make and correspond the adjustment. First introduction the utility model discloses a first direction of application distinguishes sun illumination/street lamp illumination and rear car headlight illumination night promptly.
As shown in fig. 2, the brightness adjusting circuit S1 of the present embodiment is connected to a display panel (not shown in the figure) through a driver chip IC1(integrated circuit), and the brightness adjusting circuit S1 includes: a first transistor T1, a second transistor T2, a first comparator U1, and a second comparator U2. The first transistor T1 comprises a gate, a source and a drain, and a first drain signal Vp1 is output from the drain after being illuminated; the second transistor T2 comprises a gate, a source and a drain, and a second drain signal Vp2 is outputted from the drain after being illuminated by light, the gate of the first transistor T1 is connected to the gate of the second transistor T2 and receives the base voltage Vb, and the source of the first transistor T1 is connected to the source of the second transistor T2 and receives the reference voltage Vdd; the first transistor T1 and the second transistor T2 are, for example, both photoelectric thin film transistors, and output an electrical signal at the drain when they are irradiated with light.
The first comparator U1 has a first input terminal receiving the reference voltage Vpd, a second input terminal receiving the first drain signal Vp1, and an output terminal outputting a first comparison signal cmp 1; the second comparator U2 has a first input terminal receiving the second drain signal Vp2, a second input terminal receiving the reference voltage Vpd, and an output terminal outputting a second comparison signal cmp2, and is connected to the driver IC 1. The standard voltage Vpd is a fixed voltage, has a preset certain voltage value, is used for judging the magnitude of the output voltage of the drain electrode of the transistor, and can set the voltage value according to actual requirements. The first comparison signal cmp1 is used to indicate that the first transistor T1 receives light from a first direction, and the second comparison signal cmp2 is used to indicate that the second transistor T2 receives light from a second direction.
The brightness adjusting circuit S1 further includes a third comparator U3 and a determining unit C1, the third comparator U3 has a first input terminal receiving the first drain signal Vp1, a second input terminal receiving the second drain signal Vp2, and an output terminal outputting a third comparison signal Vpx, and the third comparator U3 is configured to compare voltages of the two drain signals, wherein Vb is not greater than Vth, preferably Vb is Vth, Vdd is a reference voltage, and Vth is a threshold voltage of the transistor. In this circuit, voltages output by the drains of the first transistor T1 and the second transistor T2 are compared by a comparator, and if Vp1> Vp2, Vpx is at a high level, and if Vp1< Vp2, Vpx is at a low level. The judgment unit C1 receives the first comparison signal cmp1 and the third comparison signal Vpx, connects to the driver chip IC1, and outputs a fourth comparison signal Vco.
Specifically, the judgment unit C1 includes: a third transistor T3 and a fourth comparator U4. The gate of the third transistor T3 receives the first comparison signal cmp1, the source receives the third comparison signal Vpx, and the drain is connected to the first input terminal of the fourth comparator U4; the second input terminal of the fourth comparator U4 is grounded, and the output terminal outputs the fourth comparison signal Vco and is connected to the driver IC 1. The first ends of the first comparator U1 to the fourth comparator U4 are all positive input ends, and the second ends are all negative input ends. Therefore, the brightness adjusting circuit S1 outputs two signals, a second comparison signal cmp2 and a fourth comparison signal Vco for characterizing the first comparison signal cmp1, to the driver chip IC1, and the driver chip IC1 receives different comparison signals indicating that the display device receives light from different directions, and different operations need to be performed.
In this embodiment, it is necessary to measure the voltage of the signal Vp1 passing through the drain of the first transistor T1, the voltage Vp1 is closer to Vdd to indicate stronger illumination, when the voltage Vp1 is greater than a certain set value (Vpd), the first comparison signal cmp1 is at a high level, the voltage Vpx is measured, if the voltage Vpx is positive, the fourth comparison signal Vco is at a high level to indicate that the first drain signal Vp1 is greater than the second drain signal Vp2, and the illumination is identified as rear vehicle lamp illumination, otherwise, the illumination is solar illumination/street lamp illumination. The voltage of the signal Vp2 passing through the drain of the second transistor T2 is measured, and the illumination becomes stronger as the voltage Vp2 approaches Vdd, and when the voltage Vp2 is greater than a predetermined value, the illumination is identified as sunlight/street lamp illumination. That is, when the first drain signal Vp1 is greater than the second drain signal Vp2 and greater than the standard voltage Vpd, it is determined that the rear vehicle light is received, so as to avoid the influence of the sun light on the signal reception during daytime driving.
Specifically, the front vehicle 20 in fig. 1 is taken as an example, and the received solar light/street lamp light is a light from top to bottom, i.e. a light from an upper viewing angle, and the received rear vehicle light is a light from bottom to top, i.e. a light from a lower viewing angle. In this embodiment, the first transistor T1 is configured to receive light from a lower viewing angle, the second transistor T2 is configured to receive light from an upper viewing angle, when the first comparison signal cmp1 is greater than zero and the third comparison signal Vpx is greater than zero, the first transistor T1 is considered to receive rear vehicle light, and when the second comparison signal cmp2 is greater than zero, the second transistor T2 is considered to receive solar light. The display panel is then adjusted to the first mode according to the first comparison signal cmp1 and adjusted to the second mode according to the second comparison signal cmp 2. Since the first transistor T1 receives a part of the sunlight when the vehicle is running in the daytime, the third comparator U3 and the fourth comparator U4 are provided. When the first comparison signal cmp1 is greater than zero and the fourth comparison signal Vco is greater than zero, it indicates that the third comparison signal Vpx is greater than zero, and then the first drain signal Vp1 is greater than zero and the first drain signal Vp1 is greater than the second drain signal Vp2, so that the first transistor T1 receives light in a first direction, i.e., from the bottom to the top; when the second comparison signal cmp2 is greater than zero, it indicates that the second transistor T2 receives light from the second direction, i.e., the top-bottom direction.
The driving chip IC1 is connected between the brightness adjusting circuit S1 and the display panel, and the driving chip IC1 receives the fourth comparison signal Vco and outputs a first control signal ctl1 to the display panel, so that the display panel is switched to the first mode; the driver IC1 receives the second comparison signal cmp2, and outputs a second control signal ctl2 to the display panel, thereby switching the display panel to the second mode. The display panel can reduce the gray scale voltage of the display panel in the first mode, and adjust the backlight brightness to make the display panel in a mirror state in the second mode. That is, when it is recognized that the brightness adjusting circuit S1 receives light from the first direction, the driving chip IC1 sends a first control signal ctl1 to the display panel to control the display panel to lower the gray-scale voltage and convert the gray-scale voltage into a black image, and when it is recognized that the adjusting circuit S1 receives light from the second direction, the driving chip IC1 sends a second control signal ctl2 to the display panel to control the display panel to adjust the backlight brightness, and the display panel still maintains a normal display or a display mirror.
The present embodiment can be applied to the following aspects: on the first hand, when the brightness adjusting circuit S1 is located in a display device as a rear view mirror, the rear view mirror can switch between a mirror surface and a display screen, and when the headlight is recognized, the mirror surface state of the rear view mirror is changed into a black screen, for example, only a part of the mirror surface can be changed into a black screen, so as to reduce dazzling; when the sunlight is identified, the mirror surface is maintained or the display picture is subjected to adaptive dimming. In a second aspect, when the brightness adjusting circuit S1 is located in a display device as a windshield, for example, a rear windshield is a liquid crystal display device, and the brightness adjusting circuit S1 is installed, when the illumination of the rear headlights is recognized, the display screen is adjusted in different areas, so that the illuminated portion is a low gray level black screen or a scattering state, and the rear headlights are blocked; when the sun light is recognized, the window is kept transparent.
The brightness adjusting circuit according to the embodiment can be used for distinguishing light rays from upper and lower visual angles and realizing regional dimming, and the display device adopts a horizontal screen display screen, for example, and the raster direction is the horizontal direction. The LED street lamp is used for distinguishing daytime sun illumination/street lamp illumination and night headlamp illumination, can reduce the driving safety problem caused by the reflection of a vehicle-mounted rearview mirror on a headlamp light source during night driving, and does not influence the normal display picture.
The present embodiment is applied to a part of circuits in a display device, so that the first transistor T1 and the second transistor T2 are provided in the display device, and the distribution of the transistors is described below with reference to fig. 3a to 3 b.
Fig. 3a and fig. 3b respectively show the structural schematic diagram of the liquid crystal module corresponding to the brightness adjusting circuit according to the first embodiment of the present invention under different illumination angles.
As shown in fig. 3a, a liquid crystal display module is provided for implementing the function of the brightness adjusting circuit S1 of fig. 2, and the liquid crystal display module includes: a first glass substrate 121, first and second transistors T1 and T2, a liquid crystal molecular layer 131, a protective layer 113, a black matrix 112, and a second glass substrate 111. The first transistor T1 and the second transistor T2 are both located on the surface of the first glass substrate 121, for example, in layered form, and the transistor dielectric layer 122 is distributed on the first glass substrate 121 as a part of the transistors. The second glass substrate 111 is positioned above the first transistor T1 and the second transistor T2; the black matrix 112 is located on the surface of the second glass substrate 111 facing the first glass substrate 121; the protective layer 113 covers the black matrix 112 and the second glass substrate 111; the liquid crystal molecule layer 131 is positioned between the protective layer 113 and the first transistor T1 (and the second transistor T2), and the first transistor T1 and the second transistor T2 receive light by the barrier between the black matrix 112 thereabove. In the figure, the black matrix 112 is discontinuous, forming a gap over the transistors through which light is received, i.e., a grating. The liquid crystal display module of the present embodiment has a structure similar to that of a commonly used display module, and will not be described in detail. The grating width is mainly set by the angles of the first transistor T1 and the second transistor T2 for receiving light, for example, the angles of the first transistor T1 and the second transistor T2 for receiving light are both 0-60 °, and the grating width can be calculated according to the thickness, the refractive index and the like of each layer. The words "up" and "down" indicated in the drawings indicate the up-down direction of the display screen.
The light is irradiated to the transistors through the grating, for example, two terminals a and B at two ends of the channel of the first transistor T1 each receive light of different angles, and two terminals C and D at two ends of the channel of the second transistor T2 each receive light of different angles, the width of the grating above the first transistor T1 is the distance between EF, and the width of the grating above the second transistor T2 is the distance between GH.
The channel length AB ═ CD ═ 4um, the distance between the top of the transistor and the bottom of the protective layer 113 was typically 3.2um, the liquid crystal molecule layer LC (about 5.5um ═ PSH + RGB, PSH being the thickness of the various dielectric layers, RGB being the thickness of the pixel layer), the OC layer (Over Coat) was 1.8um, ITO (indium tin oxide conductive glass) was 0.135um, the thickness of the glass substrate was 400 μm, and the refractive indices of the respective portions were as in table 1 below.
| Medium | Refractive index | Thickness/um |
| Air | 1 | - |
| Glass | 1.52 | 400 |
| ITO | 1.85 | 0.135 |
| OC | 1.5 | 1.8 |
| LC | 1.593 | 5.5 |
TABLE 1
In order to achieve the goal that the first transistor T1 recognizes the lower viewing angle range as 0-60 °, the second transistor T2 recognizes the upper viewing angle range as 0-60 °, a triangle formed by suitable vertices in the figure is obtained, for example, AE is HD 4um, the grating width EF is GH 8.64um in fig. 3a can be calculated according to the relationship between angles and sides and the pythagorean theorem (for example only), and the smaller angle corresponds to the smaller grating width, so the FG width of the black matrix 112 can be manufactured with the minimum precision, and the smaller FG distance can save space. Similarly, setting a reasonable grating width can more effectively control the angle of illumination to the transistor.
Fig. 3b is another modified example, in fig. 3b, the illumination angles of the first transistor T1 and the second transistor T2 are both 0 to 75 °, the BC distance is about 15um, AJ is KD is 4um, and the width of the grating JK is calculated. In this embodiment, the black matrix 112 has only one grating formed at the JK, and the manufacturing process is simple, the structure is simple, and the implementation is convenient.
Example two
Fig. 4 shows a schematic circuit diagram of a brightness adjusting circuit according to a second embodiment of the present invention.
Different from the first embodiment, in order to realize the recognition and dimming of the light from the left and right viewing angles, the present embodiment provides a brightness adjusting circuit S2, which is disposed in the display device and can distinguish the light from the left and right directions, so as to make corresponding adjustment in time. This second embodiment introduces the second application direction of the present invention, i.e. distinguishing the illumination from left and right viewing angles and adjusting the brightness of the corresponding direction.
The display device of the embodiment adopts the vertical screen, and uses the vertical screen horizontally, so that the gratings are distributed in the vertical direction. For example, when the sun shines on the left side of the automobile, the driver's sight is affected by the sun's illumination, and the other places in the automobile are in the shadow of the carport, and the brightness of the two sides needs to be adjusted.
In the present embodiment, the brightness adjusting circuit S2 includes a first transistor T4, a second transistor T5, a first comparator U5, and a second comparator U6. The brightness adjusting circuit S2 of this embodiment is a part of the brightness adjusting circuit S1 of the first embodiment, in this embodiment, the first transistor T4 is equivalent to the first transistor T1 in fig. 2, the second transistor T5 is equivalent to the second transistor T2 in fig. 2, and the first transistor T4 receives illumination and outputs a first drain signal Vp11 from the drain; the second transistor T5 receives light and then outputs a second drain signal Vp12 from the drain, and the gate of the first transistor T4 is connected to the gate of the second transistor T5 and receives the base voltage Vb0, and the source of the first transistor T4 is connected to the source of the second transistor T5 and receives the reference voltage Vdd 0.
The first comparator U5 has a first input terminal receiving the first drain signal Vp11, a second input terminal receiving the standard voltage Vpd0, and an output terminal outputting a first comparison signal cmp 11; the second comparator U6 has a first input terminal receiving the reference voltage Vpd0, a second input terminal receiving the second drain signal Vp12, and an output terminal outputting a second comparison signal cmp12, wherein the first comparison signal cmp11 is used for indicating that the first transistor T4 receives light from the first direction, and the second comparison signal cmp12 is used for indicating that the second transistor T5 receives light from the second direction. The positive input terminals of the first comparator U5 and the second comparator U6 are first terminals, and the negative input terminals are second terminals. The luminance adjusting circuit S2 is connected to the driver chip IC2, and outputs two control signals, a first control signal ctl11 and a second control signal ctl12, to the driver chip IC 2.
According to a similar principle of fig. 2, when the first comparison signal cmp11 is greater than zero, the first direction is a direction from right to left; the second direction is a left-to-right direction when the second comparison signal cmp12 is greater than zero. The display panel is in the first mode, the gray scale voltage on the left side of the display panel is reduced, and the display panel is in the second mode, the gray scale voltage on the right side of the display panel is reduced.
In the circuit, Vb0 is equal to or less than Vth, preferably Vb0 is equal to Vth, Vdd0 is a reference voltage, and Vth is a threshold voltage of a transistor. The magnitude of the voltage Vp11 passing through the drain of the T4 is measured, the illumination is stronger as Vp11 approaches Vdd0, and when Vp11 is greater than a certain set value, the illumination is identified as right-view illumination, the backlight brightness is increased, and the gray scale of the left-view is reduced (for example, by adjusting the gamma voltage), and the right-view brightness enhancement is performed. The magnitude of the voltage Vp12 passing through the drain of the T5 is measured, the illumination is stronger as Vp12 approaches Vdd0, and when Vp12 is greater than a certain set value, the illumination is identified as the illumination at the left visual angle, the backlight brightness is increased, and the gray scale at the right visual angle is reduced (the gamma voltage is adjusted), and the brightness at the left visual angle is increased.
The operation and principle of the circuit in this embodiment will not be described in detail, and reference may be made to the description of fig. 2.
In this embodiment, the light from the left and right directions is identified by the setting of the brightness adjusting circuit S2, and brightness adjustment is made accordingly, when the left side is illuminated brightly, the left side brightness is adjusted brightly, so that the eyes of people are comfortable, and the right side is the same.
Fig. 5 is a schematic structural diagram of a liquid crystal module corresponding to the brightness adjusting circuit according to the second embodiment of the present invention.
As shown in fig. 5, the liquid crystal display module includes a first glass substrate 521, a transistor dielectric layer 522, a first transistor T4, a second transistor T5, a liquid crystal molecular layer 531, a protective layer 513, a black matrix 512, and a second glass substrate 511, which are the same as the structures shown in the first embodiment and will not be described in detail again.
In this embodiment, a second black matrix layer, i.e., a black matrix 514, is further included. The black matrix 512 is similar to the black matrix in fig. 3a, the black matrix 514 is similar to the black matrix in fig. 3b, and the incident angle of light is in the range of 0-45 °, and the corresponding grating width can be obtained according to the thickness and refractive index of each layer, so that the black matrix layer is reasonably arranged. In the drawings, "up/left" and "down/right" are indicated as the directions of the display screen, i.e., upper is taken as the left side and lower is taken as the right side.
Fig. 6a and 6b are schematic diagrams showing simple structures of display devices according to a third embodiment and a fourth embodiment of the present invention, respectively.
Fig. 6a shows a schematic diagram of a display device according to a third embodiment, which includes a display panel 110, a circuit board 118, and a brightness adjusting circuit S10, where the brightness adjusting circuit S10 is S1 shown in fig. 2 or S2 shown in fig. 4. The display panel 110 displays pictures with different brightness according to the different brightness of the backlight. In the present embodiment, one or more brightness adjusting circuits S10 (e.g., 4) are disposed on the glass substrate of the liquid crystal display device, for example, the brightness adjusting circuit S10 is disposed in a region other than the display region, and the driver chip IC is disposed on the circuit board 118. The circuits S10 are disposed in the figure for the adjustment of the split-zone dimming, and one brightness adjusting circuit S10 controls the adjustment of the pixels corresponding to several rows or columns. In fig. 6a, the display area is divided into 4 areas, B1, B2, B3 and B4, and each of the luminance adjusting circuits S10 controls the luminance of the display panel of one area. The raster direction corresponding to the luminance adjusting circuit S10 is shown on the right side, and the space between the black matrices 112 is the raster 117.
As shown in fig. 6b, the display device of the fourth embodiment includes a display panel 610 and a circuit board 618, the driving chip IC is disposed on the circuit board 618, and in the present embodiment, the brightness adjusting circuits S11 and S21 are disposed in the display region, for example, near the pixel electrodes (RGB represents three colors of red, green and blue). The display area is divided into a plurality of areas, a plurality of brightness adjusting circuits are arranged on the display panel 610, and one brightness adjusting circuit is correspondingly arranged in each area, as shown in fig. 6b, the brightness adjusting circuit S11 is arranged in the first row, and the brightness adjusting circuit S21 is arranged in the second row. Each brightness adjusting circuit respectively controls one or more pixels in the range to adjust the brightness, and each circuit is connected to the driving chip IC. The right side is a schematic view of the grating direction, and the space 617 between the black matrix 612 is a grating.
Fig. 7a and 7b show a simple structure schematic diagram of a vehicle according to a fifth embodiment and a sixth embodiment of the present invention, respectively.
The utility model also provides a vehicle, including the display device that figure 6a or figure 6b show, display device is as vehicle's rear-view mirror and rear windshield etc..
Fig. 7a shows a simple diagram of a fifth embodiment of a vehicle, as shown in fig. 7a, that is, the present invention provides a first application direction, which realizes upper and lower view angle regional dimming (adopts a horizontal screen display) for distinguishing daytime sunlight illumination/street lamp illumination and night headlamp illumination, and reduces driving safety problems caused by reflection of the vehicle-mounted rearview mirror to the headlamp light source.
In this embodiment, the vehicle is, for example, an automobile 210, and the rear view mirror 211 or the rear windshield 212 is provided as a liquid crystal display device, which can realize switching between a black screen and a display screen. The brightness adjusting circuit S1 in fig. 2 is used for the mirror 211, and when the headlight is illuminated, the mirror 211 is changed from a mirror surface to a black screen, so that glare is reduced. When the sunlight is identified, the mirror surface is maintained or the display picture is subjected to adaptive dimming.
The rear windshield 211 adopts the brightness adjusting circuit S1 in fig. 2, and when the illumination of the rear headlights is recognized, the screen is adjusted to be a low-gray-scale black screen or a scattering state in different regions, so as to block the rear headlights from dazzling. When solar illumination is recognized, transparency is maintained. Therefore, dazzling of the rear lamp light to the driver is avoided, and driving safety is improved.
Fig. 7b is a simplified diagram of a vehicle according to a sixth embodiment, and as shown in fig. 7b, the vehicle is, for example, a vehicle 220, and a display screen 223 of the vehicle includes a brightness adjusting circuit S2 shown in fig. 4, for implementing left-right view angle split zone dimming (using a vertical screen display in a horizontal direction). For example, the display screen 223 may adopt a dual view (dual view) in which the screen brightness adjustment for the two different viewing angles is performed in a time-sharing manner. Light rays from left and right visual angles are identified, brightness adjustment is respectively carried out, the self-adaptive dimming function of distinguishing the left and right visual angles is achieved, and use experience is enriched.
The utility model provides a brightness control circuit, display module assembly, display device and vehicle, including first transistor and second transistor, first transistor receives illumination back from the first drain electrode signal of drain electrode output, the second transistor receives illumination back from drain electrode output second drain electrode signal, when first comparison signal is greater than the specified value, the first transistor of sign receives the light from first direction, make display panel adjust to first mode, when second comparison signal is greater than the specified value, the light from the second direction is received to the second transistor of sign, make display panel adjust to the second mode. Therefore, the direction of light can be identified according to the voltage output by the first transistor and the second transistor, so that the brightness of the display panel is adjusted, the interference of external light is reduced, and the glare is reduced.
Finally, it should be noted that: in accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention. The embodiment was chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its practical application in conjunction with the modifications made to the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A brightness adjustment circuit connected to a driver chip, comprising:
a first transistor including a gate, a source, and a drain, the first transistor outputting a first drain signal from the drain of the first transistor after being irradiated with light;
a second transistor including a gate, a source, and a drain, the second transistor outputting a second drain signal from the drain of the second transistor after being irradiated with light, and the gate and the source of the first transistor being connected to the gate and the source of the second transistor, respectively;
a first comparator, wherein a first input end receives a standard voltage, a second input end receives the first drain signal, and an output end outputs a first comparison signal;
a second comparator, wherein a first input end receives the second drain signal, a second input end receives the standard voltage, and an output end is connected with the driving chip and outputs a second comparison signal;
a third comparator, wherein the first input end receives the first drain signal, the second input end receives the second drain signal, and the output end outputs a third comparison signal;
a judging unit for receiving the first comparison signal and the third comparison signal, connecting the driving chip and outputting a fourth comparison signal,
the driving chip outputs a first control signal according to the fourth comparison signal; and the driving chip outputs a second control signal according to the second comparison signal.
2. The luminance adjustment circuit according to claim 1, wherein the judgment unit includes:
a third transistor including a gate, a source and a drain, the gate of the third transistor being connected to the output terminal of the first comparator and receiving the first comparison signal, and the source receiving the third comparison signal; and
and a fourth comparator, wherein the first input end of the fourth comparator is connected with the drain electrode of the third transistor, the second input end of the fourth comparator is grounded, and the output end of the fourth comparator is connected with the driving chip and outputs a fourth comparison signal.
3. The circuit of claim 1, wherein the driver chip is coupled between the circuit and a display panel, the display panel displays a black image according to the first control signal, and the display panel displays a mirror surface according to the second control signal.
4. A brightness adjustment circuit connected to a driver chip, comprising:
a first transistor including a gate, a source, and a drain, the first transistor outputting a first drain signal from the drain of the first transistor after being irradiated with light;
a second transistor including a gate, a source, and a drain, the second transistor outputting a second drain signal from the drain of the second transistor after being irradiated with light, and the gate and the source of the first transistor being connected to the gate and the source of the second transistor, respectively;
a first comparator, wherein a first input end receives the first drain signal, a second input end receives a standard voltage, and an output end is connected with the driving chip and outputs a first comparison signal;
a second comparator, the first input end receives the standard voltage, the second input end receives the second drain signal, the output end is connected with the driving chip and outputs a second comparison signal,
the driving chip outputs a first control signal according to the first comparison signal; and the driving chip outputs a second control signal according to the second comparison signal.
5. The circuit of claim 4, wherein the driver chip is connected between the circuit and a display panel, the first comparison signal is at a high level, and the first control signal is an active signal; the second comparison signal is at a high level, and the second control signal is an active signal.
6. A liquid crystal display module for implementing the brightness adjusting circuit of any one of claims 1-5, comprising:
a first glass substrate;
a first transistor and a second transistor on a surface of the first glass substrate;
a second glass substrate located over the first transistor and the second transistor;
the black matrix is positioned on the surface of the second glass substrate facing the first glass substrate;
a protective layer covering the black matrix and the second glass substrate;
a layer of liquid crystal molecules located between the protective layer and the first transistor,
the first transistor and the second transistor receive light by a grating between the black matrices above them.
7. A display device, comprising:
a display panel for displaying pictures with different brightness according to different backlight brightness, wherein the display panel comprises a plurality of brightness adjusting circuits according to any one of claims 1-5, and each brightness adjusting circuit respectively controls the brightness of the display panel in one region.
8. The display device according to claim 7, wherein a plurality of the brightness adjusting circuits are disposed in the non-display region of the display panel, and each of the brightness adjusting circuits correspondingly controls the brightness of a plurality of rows or columns of pixel units.
9. The display device according to claim 7, wherein a plurality of the brightness adjustment circuits are disposed in a display area of the display panel, the display area includes a plurality of areas, and one of the brightness adjustment circuits is disposed in each of the areas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023163802.4U CN213904903U (en) | 2020-12-24 | 2020-12-24 | Brightness adjusting circuit, liquid crystal module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023163802.4U CN213904903U (en) | 2020-12-24 | 2020-12-24 | Brightness adjusting circuit, liquid crystal module and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213904903U true CN213904903U (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023163802.4U Active CN213904903U (en) | 2020-12-24 | 2020-12-24 | Brightness adjusting circuit, liquid crystal module and display device |
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| Country | Link |
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| CN (1) | CN213904903U (en) |
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