CN112327544A - Pixel unit, display panel and display device - Google Patents
Pixel unit, display panel and display device Download PDFInfo
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- 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
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Abstract
The invention discloses a pixel unit, a display panel and a display device, wherein the pixel unit comprises: the display device comprises a main pixel part, a pixel part and a pixel part, wherein the main pixel part comprises a plurality of first sub-pixel electrodes which are arranged at intervals; a sub-pixel section including at least: the first sub-pixel part comprises a plurality of second sub-pixel electrodes which are arranged at intervals; a second sub-pixel section: the second sub-pixel part comprises a plurality of third sub-pixel electrodes which are arranged at intervals; the main pixel part, the first sub-pixel part and the second sub-pixel part are connected into a whole, and the arrangement structures of the first sub-pixel electrode, the second sub-pixel electrode and the third sub-pixel electrode are different from each other, so that electric fields formed on the main pixel part, the first sub-pixel part and the second sub-pixel part have different electric field strengths and/or electric field directions. The invention can solve the problem of color cast of the liquid crystal display panel under a large visual angle, improve the aperture opening ratio of the pixel and improve the display quality of the display panel.
Description
Technical Field
The invention relates to the field of displays, in particular to a pixel unit, a display panel and a display device.
Background
Currently, a Liquid Crystal Display (LCD) device is one of the most widely used displays, and the LCD includes a pair of panels provided with field generating electrodes such as pixel electrodes and a common electrode, and a Liquid Crystal layer disposed between the two panels.
Among them, the Vertical Alignment (VA) mode of the liquid crystal display is a common display mode having advantages of high contrast, wide viewing angle, no rubbing alignment, and the like. However, since the VA mode employs vertically rotating liquid crystals, the difference of birefringence of liquid crystal molecules is large under different viewing angles, which leads to a serious problem of color shift under large viewing angles.
To improve this problem, a pixel design is proposed in the art, in which each pixel is divided into two regions, and the two regions have two pixel voltages, and different liquid crystal orientations are realized by voltage differences to improve the color shift problem. However, to form a potential difference between two regions of the pixel, three Thin Film Transistors (TFTs) and two scan lines are required for each pixel to control the charging of the pixel, which greatly reduces the aperture ratio of the pixel, reduces the transmittance of the panel, and affects the display quality of the panel.
Disclosure of Invention
The present invention is directed to a pixel unit, a display panel and a display device, and aims to solve the problem of color shift of a liquid crystal display panel under a large viewing angle, increase the aperture ratio of pixels and improve the display quality of the display panel.
To achieve the above object, the present invention provides a pixel unit, including: the display device comprises a main pixel part, a pixel part and a pixel part, wherein the main pixel part comprises a plurality of first sub-pixel electrodes which are arranged at intervals; a sub-pixel section including at least: the first sub-pixel part comprises a plurality of second sub-pixel electrodes which are arranged at intervals; a second sub-pixel section: the second sub-pixel part comprises a plurality of third sub-pixel electrodes which are arranged at intervals; the main pixel part, the first sub-pixel part and the second sub-pixel part are connected into a whole, and the arrangement structures of the first sub-pixel electrode, the second sub-pixel electrode and the third sub-pixel electrode are different from each other, so that electric fields formed on the main pixel part, the first sub-pixel part and the second sub-pixel part have different electric field strengths and/or electric field directions.
Optionally, the first subpixel electrode has a first width, the second subpixel electrode has a second width, the third subpixel electrode has a third width, and the first width, the second width, and the third width are different from each other.
Optionally, a first pitch is formed between two adjacent first sub-pixel electrodes, a second pitch is formed between two adjacent second sub-pixel electrodes, a third pitch is formed between two adjacent third sub-pixel electrodes, and the first pitch, the second pitch, and the third pitch are not equal to each other.
Optionally, the ratio of the first width to the first pitch, the ratio of the second width to the second pitch, and the ratio of the third width to the third pitch are sequentially decreased.
Optionally, a first angle is formed between the first subpixel electrode and the extending direction of the scan line, a second angle is formed between the second subpixel electrode and the extending direction of the scan line, a third angle is formed between the third subpixel electrode and the extending direction of the scan line, and the first angle, the second angle, and the third angle are not equal to each other.
Optionally, the difference between the first angle, the second angle and the third angle and 45 ° increases in sequence.
Optionally, a ratio of an area of the main pixel part to a sum of the areas of the first sub-pixel part and the second sub-pixel part is greater than 1: 1 and less than 2: 3.
optionally, the main pixel portion further includes a first main pixel electrode in a cross shape, the first main pixel electrode divides the main pixel portion into four main display domains, the first sub-pixel electrodes extend from the first main pixel electrode in different directions, and the extending directions of the first sub-pixel electrodes in the same main display domain are the same; the first sub-pixel part also comprises a second main pixel electrode in a cross shape, the second main pixel electrode divides the first sub-pixel part into four first sub-display domains, the second sub-pixel electrodes extend from the second main pixel electrode along different directions, and the extending directions of the second sub-pixel electrodes in the same first sub-display domain are the same; and/or the second sub-pixel part also comprises a cross-shaped third main pixel electrode which divides the second sub-pixel part into four second sub-display domains, the third sub-pixel electrodes extend from the third main pixel electrode along different directions, and the extension directions of the third sub-pixel electrodes in the same second sub-display domain are the same.
The present invention further provides a display panel, comprising: the first substrate is provided with a plurality of data lines, scanning lines and a plurality of pixel units limited by the data lines and the scanning lines, the pixel units are the pixel units, each pixel unit is correspondingly provided with a thin film transistor, and the data lines, the scanning lines and the pixel units are electrically connected with the thin film transistors; the second substrate is arranged opposite to the first substrate and is provided with a common electrode corresponding to the pixel unit; and a liquid crystal layer filled between the first substrate and the second substrate.
The invention further provides a display device, which comprises the display panel and a backlight module, wherein the backlight module is used for providing backlight to the display panel.
The technical scheme of the invention is that the arrangement structures of a plurality of first sub-pixel electrodes in a main pixel part, a plurality of second sub-pixel electrodes in a first sub-pixel part and a plurality of third sub-pixel electrodes in a second sub-pixel part are different from each other, so that electric fields formed on the main pixel part, the first sub-pixel part and the second sub-pixel part have different electric field strengths and/or electric field directions, and under the action of electric fields with different electric field strengths and/or electric field directions, the deflection angles of liquid crystal molecules in three areas of the main pixel part, the first sub-pixel part and the second sub-pixel part are different from each other, so that the liquid crystal molecules corresponding to the main pixel part, the first sub-pixel part and the second sub-pixel part have different light transmittances, and the color cast problem of a display panel under a large viewing angle is effectively improved; in addition, the main pixel part, the first sub-pixel part and the second sub-pixel part of the pixel unit are driven by only one thin film transistor, and a plurality of thin film transistors are not required to be arranged to control the charging of the pixels, so that the pixels can be ensured to have higher aperture opening ratio, the display panel can be ensured to have higher brightness, and the display quality of the display panel can be further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a pixel unit according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a main pixel portion of the pixel unit of FIG. 1;
FIG. 3 is a schematic structural diagram of a pixel unit according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a pixel unit according to another embodiment of the invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a pixel unit.
In the embodiment of the present invention, as shown in fig. 1, the pixel unit includes: a main pixel part 10, wherein the main pixel part 10 comprises a plurality of first sub-pixel electrodes 11 arranged at intervals; a sub-pixel section including at least: a first sub-pixel part 20, the first sub-pixel part 20 including a plurality of second sub-pixel electrodes 21 arranged at intervals; second sub-pixel section 30: the second sub-pixel part 30 includes a plurality of third sub-pixel electrodes 31 arranged at intervals; the main pixel part 10, the first sub-pixel part 20 and the second sub-pixel part 30 are connected into a whole, and the arrangement structures of the first sub-pixel electrode 11, the second sub-pixel electrode 21 and the third sub-pixel electrode 31 are different from each other, so that electric fields formed on the main pixel part 10, the first sub-pixel part 20 and the second sub-pixel part 30 have different electric field strengths and/or electric field directions from each other.
It is easily understood that the liquid crystal 40 is a substance state between a liquid and a crystal, and has both fluidity of the liquid and anisotropy of the crystal. The liquid crystal 40 material is an organic compound of long molecules, which is a nonlinear optical material. When the liquid crystal molecules 40 are aligned in order, optical anisotropy is exhibited, and when light passes through the liquid crystal 40, effects such as polarization plane rotation, birefringence, and the like are generated. The liquid crystal molecules 40 are polar molecules containing polar groups, and under the action of an electric field, dipoles can be oriented along the direction of the electric field, so that the original arrangement mode of the molecules is changed, and the optical properties of the liquid crystal 40 are changed accordingly.
In the present invention, the main pixel portion 10, the first sub-pixel portion 20 and the second sub-pixel portion 30 are integrally connected, specifically, the first sub-pixel portion 20 is connected to the main pixel portion 10, the second sub-pixel portion 30 is connected to the first sub-pixel portion 20, the main pixel portion 10 is electrically connected to a thin film transistor 50(TFT), that is, the main pixel portion 10, the first sub-pixel portion 20 and the second sub-pixel portion 30 are driven by one thin film transistor 50, and the main pixel portion 10, the first sub-pixel portion 20 and the second sub-pixel portion 30 have the same driving voltage.
The arrangement structures of the plurality of first sub-pixel electrodes 11 in the main pixel portion 10, the plurality of second sub-pixel electrodes 21 in the first sub-pixel portion 20 and the plurality of third sub-pixel electrodes 31 in the second sub-pixel portion 30 are different from each other, so that electric fields formed on the main pixel portion 10, the first sub-pixel portion 20 and the second sub-pixel portion 30 have different electric field strengths and/or electric field directions, and under the action of electric fields with different electric field strengths and/or electric field directions, the deflection angles of the liquid crystal molecules 40 in three regions of the main pixel portion 10, the first sub-pixel portion 20 and the second sub-pixel portion 30 are different from each other, so that the liquid crystal molecules 40 corresponding to the main pixel portion 10, the first sub-pixel portion 20 and the second sub-pixel portion 30 have different light transmittances, and further, the color cast problem of the display panel under a large viewing angle is effectively improved.
Moreover, the main pixel portion 10, the first sub-pixel portion 20 and the second sub-pixel portion 30 of the pixel unit are driven by only one thin film transistor 50(TFT), and there is no need to provide a plurality of TFTs 50 to control the charging of the pixel, so that the pixel has a higher aperture ratio, the display panel has higher brightness, and the display quality of the display panel is further improved.
In the technical solution of the above embodiment, the sub-pixel portion may be further divided such that the sub-pixel portion includes the first sub-pixel portion 20, the second sub-pixel portion 30, the third sub-pixel portion, and so on, and the number of the sub-pixel portions is not limited herein. Considering that if the sub-pixel portion is divided into a plurality of regions, not only the structure complexity is increased, which is not beneficial to the production and manufacturing, but also the loss of capacitance between different pixel regions is increased, which is not beneficial to the display quality, it is found through research and experiments of researchers that when the sub-pixel portion is divided into two pixel regions, namely, the first sub-pixel portion 20 and the second sub-pixel portion 30, the display effect of the liquid crystal display panel is better, and therefore, the embodiment of the invention preferably divides the pixel unit into the main pixel portion 10, the first sub-pixel portion 20 and the second sub-pixel portion 30.
Further, the main pixel portion 10 further includes a first main pixel electrode 12 in a cross shape, the first main pixel electrode 12 divides the main pixel portion 10 into four main display domains 13, the first sub-pixel electrodes 11 extend from the first main pixel electrode 12 in different directions, and the extending directions of the first sub-pixel electrodes 11 in the same main display domain 13 are the same; and/or, the first sub-pixel part 20 further includes a second main pixel electrode in a cross shape, the second main pixel electrode divides the first sub-pixel part 20 into four first sub-display domains, the second sub-pixel electrodes 21 extend from the second main pixel electrode in different directions, and the extending directions of the second sub-pixel electrodes 21 in the same first sub-display domain are the same; and/or, the second sub-pixel 30 further includes a cross-shaped third main pixel electrode, the third main pixel electrode divides the second sub-pixel 30 into four second sub-display domains, the third sub-pixel electrodes 31 extend from the third main pixel electrode along different directions, and the extending directions of the third sub-pixel electrodes 31 in the same second sub-display domain are the same.
In order to further improve color shift, for three pixel regions of the main pixel part 10, the first sub-pixel part 20, and the second sub-pixel part 30, each pixel region may be further subdivided into a plurality of display domains. Referring to fig. 2, the main pixel portion 10 is described as an example.
The main pixel portion 10 further includes a first main pixel electrode 12 in a cross shape, the first main pixel electrode 12 divides the main pixel portion 10 into four main display domains 13, the first sub-pixel electrodes 11 extend from the first main pixel electrode 12 in different directions, and the extending directions of the first sub-pixel electrodes 11 in the same main display domain 13 are the same. That is, in the main pixel unit 10, the extending directions of the first subpixel electrodes 11 in the four main display domains 13 are different from each other, so that the electric field formed has four different electric field directions, thereby causing the liquid crystal molecules 40 corresponding to the respective main display domains 13 to have different deflection angles, further causing the liquid crystal molecules 40 of the four main display domains 13 of the main pixel unit 10 to have different light transmittances, increasing the diversity of the deflection states of the liquid crystal molecules 40 on the main pixel unit 10, and further improving the color shift problem of the display panel at a large viewing angle.
Similarly, the arrangement and effects of the division between the first sub-pixel unit 20 and the second sub-pixel unit 30 are the same as those of the main pixel unit 10, and are not described herein again. That is, the first sub-pixel part 20 is divided into four first sub-display domains, and the second sub-pixel part 30 is divided into four second sub-display domains. Thus, one pixel unit has twelve display domains in total, and the light transmittances of the liquid crystal molecules 40 of the twelve display domains are different, so that the color cast problem of the display panel under a large viewing angle can be remarkably improved; in addition, only one TFT is needed to drive one pixel unit, so that the pixel has a higher aperture ratio, the display panel has higher brightness, and the display quality of the display panel is further improved.
Specifically, the first sub-pixel electrode 11 has a first width W1, the second sub-pixel electrode 21 has a second width W2, the third sub-pixel electrode 31 has a third width W3, and the first width W1, the second width W2, and the third width W3 are different from each other.
It should be noted that, as shown in fig. 2, the width of the sub-pixel electrode in this embodiment refers to the distance between two opposite edges of the sub-pixel electrode in the direction perpendicular to the extension direction of the sub-pixel electrode, and is denoted by W here.
The first width W1 of the first sub-pixel electrode 11, the second width W2 of the second sub-pixel electrode 21 and the third width W3 of the third sub-pixel electrode 31 are set to be different from each other, so that electric fields formed on the main pixel unit 10, the first sub-pixel unit 20 and the second sub-pixel unit 30 have different electric field strengths, and under the action of the electric fields with different electric field strengths, the deflection angles of the liquid crystal molecules 40 in three regions of the main pixel unit 10, the first sub-pixel unit 20 and the second sub-pixel unit 30 are different from each other, so that the liquid crystal molecules 40 corresponding to the main pixel unit 10, the first sub-pixel unit 20 and the second sub-pixel unit 30 have different light transmittances, and the color cast problem of the display panel under a large viewing angle is effectively improved.
Specifically, a first pitch L1 is formed between two adjacent first sub-pixel electrodes 11, a second pitch L2 is formed between two adjacent second sub-pixel electrodes 21, a third pitch L3 is formed between two adjacent third sub-pixel electrodes 31, and the first pitch L1, the second pitch L2, and the third pitch L3 are different from each other.
It should be noted that, as shown in fig. 2, the distance between two adjacent sub-pixel electrodes in this embodiment refers to the distance between the adjacent edges of two adjacent sub-pixel electrodes along the direction perpendicular to the extension direction of the sub-pixel electrodes, and is denoted by L here.
The first pitch L1 of the first sub-pixel electrode 11, the second pitch L2 of the second sub-pixel electrode 21 and the third pitch L3 of the third sub-pixel electrode 31 are set to be different from each other, so that electric fields formed on the main pixel unit 10, the first sub-pixel unit 20 and the second sub-pixel unit 30 have different electric field strengths, and under the action of the electric fields with different electric field strengths, the deflection angles of the liquid crystal molecules 40 in three regions of the main pixel unit 10, the first sub-pixel unit 20 and the second sub-pixel unit 30 are different from each other, so that the liquid crystal molecules 40 corresponding to the main pixel unit 10, the first sub-pixel unit 20 and the second sub-pixel unit 30 have different light transmittances, and the color cast problem of the display panel under a large viewing angle is effectively improved.
As one embodiment of the present invention, as shown in fig. 1, the areas of the main pixel unit 10, the first sub-pixel unit 20, and the second sub-pixel unit 30 are all the same, and the ratio of the first width W1 to the first pitch L1, the ratio of the second width W2 to the second pitch L2, and the ratio of the third width W3 to the third pitch L3 decrease in order.
When the area size of the pixel region is the same, if the sum of the width W of the sub-pixel electrode and the pitch L between adjacent sub-pixel electrodes is a fixed value, the larger the W/L value is, the larger the number of pixel electrodes of the pixel unit is, the more and denser horizontal electric field can be formed with the common electrode, and the light transmittance of the corresponding liquid crystal molecules 40 is relatively increased. Therefore, with the above arrangement, the light transmittances of the liquid crystal molecules 40 corresponding to the main pixel portion 10, the first sub-pixel portion 20 and the second sub-pixel portion 30 are sequentially decreased, that is, the liquid crystal molecules 40 corresponding to the three pixel regions have different light transmittances, so that the color shift problem of the display panel under a large viewing angle is effectively improved; meanwhile, since the main pixel portion 10 is connected to the thin film transistor 50, the first sub-pixel portion 20 is connected to the main pixel portion 10, and the second sub-pixel portion 30 is connected to the first sub-pixel portion 20, the main pixel portion 10 receives an electrical signal from the thin film transistor 50 and sequentially transmits the electrical signal to the first sub-pixel portion 20 and the second sub-pixel portion 30, and during the transmission process, the capacitance is lost, so that the capacitances on the main pixel portion 10, the first sub-pixel portion 20, and the second sub-pixel portion 30 are sequentially decreased, and the light transmittances of the liquid crystal molecules 40 corresponding to the main pixel portion 10, the first sub-pixel portion 20, and the second sub-pixel portion 30 are sequentially decreased, so that the difference among the main pixel portion 10, the first sub-pixel portion 20, and the second sub-pixel portion 30 is larger, and the color shift is further effectively improved.
Further, the ratio of the first width W1 to the first pitch L1 is 2, the ratio of the second width W2 to the second pitch L2 is 1.4, and the ratio of the third width W3 to the third pitch L3 is 1.
Through research and experiments of researchers, when the main pixel section 10, the first sub-pixel section 20 and the second sub-pixel section 30 have the same area and the main pixel section 10, the first sub-pixel section 20 and the second sub-pixel section 30 are set to W1/L1 being 2, W2/L2 being 1.4 and W3/L3 being 1, W1/L1> W2/L2> W3/L3, the pixel unit has a better effect of improving color cast. Therefore, the present invention takes this value as a preferred embodiment.
Specifically, the first width W1 is 4 μm, and the first pitch L1 is 2 μm; the second width W2 is 3.5 μm, and the second pitch L2 is 2.5 μm; the third width W3 is 3 μm, and the third pitch L3 is 3 μm.
In this embodiment, the areas of the main pixel unit 10, the first sub-pixel unit 20, and the second sub-pixel unit 30 are the same, and a scheme of W + L being 6um is adopted, and it is found through research and experiments by researchers that when the main pixel unit 10, the first sub-pixel unit 20, and the second sub-pixel unit 30 are set to W1 being 4um, L1 being 2um, W2 being 3.5um, L2 being 2.5um, W3 being 3um, and L3 being 3um, W1/L1> W2/L2> W3/L3, the pixel unit has a better effect of improving color shift. Therefore, the present invention takes this value as a preferred embodiment. Of course, the values of W1, W2 and W3, and L1, L2 and L3 are not limited herein, and W1, W2 and W3 are suggested to be in the range of 3 μm to 4 μm, and L1, L2 and L3 are suggested to be in the range of 2 μm to 3 μm, on the premise that W + L is 6 um.
In this embodiment, as shown in fig. 1, a first angle is formed between the first sub-pixel electrode 11 and the extending direction of the scan line 70
A second angle is formed between the second sub-pixel electrode 21 and the extending direction of the scan line 70
A third angle is formed between the third sub-pixel electrode 31 and the extending direction of the scan line 70
Preferably, the first angle
Second angle
And a third angle
Are all 45 (the angle here refers to the acute angle formed between the sub-pixel electrode and the extending direction of the scanning line 70).
According to the formula of penetration rate
(wherein,
the azimuth angle between the absorption axis of the polarizer and the long axis of the liquid crystal molecules 40 may be set as the absorption axis of the polarizer is generally parallel or perpendicular to the glass substrate
The included angle between the pixel electrode and the glass substrate in the parallel or vertical direction is understood; where Δ n is the birefringence of the liquid crystal molecules 40, d is the cell thickness of the liquid crystal 40 cell, and λ is the wavelength of transmitted light), and when set
In this case, the transmittance T of the display panel may have a maximum value, so that the present invention uses this value as a preferred embodiment, which is beneficial to further improving the display quality of the display panel.
In another embodiment of the present invention, as shown in fig. 3, a first angle is formed between the first sub-pixel electrode 11 and the extending direction of the scan line 70
A second angle is formed between the second sub-pixel electrode 21 and the extending direction of the scan line 70
A third angle is formed between the third sub-pixel electrode 31 and the extending direction of the scan line 70
And a first angle
Second angle
And a third angle
Are not equal to each other.
According to the formula of penetration rate
It can be known that the included angle between the pixel electrode and the glass substrate in the parallel or perpendicular direction is changed
The inclination angle of the liquid crystal molecules 40 can be changed, and the transmittance of the display panel can be changed. Therefore, the present embodiment uses the first angle of the main pixel part 10, the first sub-pixel part 20 and the second sub-pixel part 30
Second angle
And a third angle
The electric fields formed on the main pixel part 10, the first sub-pixel part 20 and the second sub-pixel part 30 have different electric field directions, and under the action of the electric fields in different electric field directions, the deflection angles of the liquid crystal molecules 40 in three areas of the main pixel part 10, the first sub-pixel part 20 and the second sub-pixel part 30 are different, so that the liquid crystal molecules 40 corresponding to the main pixel part 10, the first sub-pixel part 20 and the second sub-pixel part 30 have different light transmittances, and the color cast problem of the display panel under a large viewing angle is effectively improved.
Further, the first angle
Second angle
And a third angle
The difference from 45 ° is sequentially increased.
According to penetrationFormula of rate
In a clear view of the above, it is known that,
the display panel transmittance T may be maximized, and thus the main pixel portion 10, the first sub-pixel portion 20 and the second sub-pixel portion 30 are disposed in this embodiment
The light transmittances of the liquid crystal molecules 40 corresponding to the main pixel part 10, the first sub-pixel part 20 and the second sub-pixel part 30 are sequentially decreased, that is, the liquid crystal molecules 40 corresponding to the three pixel regions have different light transmittances, so that the problem of color cast under a large viewing angle is effectively solved; meanwhile, the main pixel portion 10 is connected to the thin film transistor 50, the first sub-pixel portion 20 is connected to the main pixel portion 10, and the second sub-pixel portion 30 is connected to the first sub-pixel portion 20, so that the main pixel portion 10 receives an electrical signal from the thin film transistor 50 and sequentially transmits the electrical signal to the first sub-pixel portion 20 and the second sub-pixel portion 30, and during the transmission process, the capacitance is lost, so that the capacitances on the main pixel portion 10, the first sub-pixel portion 20, and the second sub-pixel portion 30 are sequentially decreased, and in combination with the sequentially decreased light transmittances of the liquid crystal molecules 40 corresponding to the main pixel portion 10, the first sub-pixel portion 20, and the second sub-pixel portion 30, the difference among the main pixel portion 10, the first sub-pixel portion 20, and the second sub-pixel portion 30 is larger, so as to further effectively improve color shift.
In particular, the first angle
Second angle
And a third angle
Are respectively 45 degrees, 40 degrees and 60 degrees.
To make the main pixel part 10, the first sub-imageThe difference between the deflection angles of the liquid crystal molecules 40 in the three pixel regions of the pixel part 20 and the second sub-pixel part 30 should be made as large as possible, but in order to ensure a high transmittance in each pixel region, the difference between the first angle, the second angle, and the third angle and 45 ° should be made as small as possible, that is, a balance should be made between improving color shift and ensuring transmittance. It has been found through research and experiments of researchers that the main pixel part 10, the first sub-pixel part 20 and the second sub-pixel part 30 are arranged in such a way that the main pixel part 10, the first sub-pixel part 20 and the second sub-pixel part 30 have the same area
In this case, the pixel unit has a better effect of improving color cast. Therefore, the present invention takes this value as a preferred embodiment. Of course, this is not to the first angle
Second angle
And a third angle
Is limited to ensure
Under the premise of (1), the first angle
Second angle
And a third angle
It is suggested thatA value in the range of 30 ° to 60 °.
Optionally in
In addition, the areas of the main pixel section 10, the first sub-pixel section 20 and the second sub-pixel section 30 may be the same, and W1/L1 ═ W2/L2 ═ W3/L3 ═ 1.4 may be provided.
Specifically, W1 ═ W2 ═ W3 ═ 3.5 μm, and L1 ═ L2 ═ L3 ═ 2.5 μm. Of course, other values for W1, W2 and W3, and L1, L2 and L3 may be used.
As still another embodiment of the present invention, as shown in fig. 4, the ratio of the area of the main pixel portion 10 to the sum of the areas of the first sub-pixel portion 20 and the second sub-pixel portion 30 is less than 1: 1 and greater than 2: 3, and the liquid crystal molecules 40 corresponding to the three regions of the main pixel portion 10, the first sub-pixel portion 20 and the second sub-pixel portion 30 have different light transmittances from each other.
It is easy to understand that if the difference between the areas of the main pixel portion 10 and the sub-pixel portion is too large, it will affect the imaging effect of the display panel, and it will be not beneficial to the array arrangement of the pixel units on the display panel, therefore, the difference between the areas of the main pixel portion 10 and the sub-pixel portion should be as small as possible, but in order to ensure the effect of improving the color shift, the sub-pixel portion is divided into at least a first sub-pixel portion 20 and a second sub-pixel portion 30, therefore, the sub-pixel portion should be as large as possible as the main pixel portion 10, that is, a balance should be obtained between improving the color shift and ensuring the imaging effect. It was found through research and experiments by researchers that the range of the ratio of the area of the main pixel part 10 to the sum of the areas of the first sub-pixel part 20 and the second sub-pixel part 30 is set to be less than 1: 1 and greater than 2: 3, the pixel unit has better effect of improving color cast. Therefore, the present invention takes this value as a preferred embodiment. Wherein the first angle can be set in the main pixel part 10, the first sub-pixel part 20 and the second sub-pixel part 30
Second angle
And a third angle
45 °, 35 °, and 60 ° (i.e., different from each other), respectively, so that the liquid crystal molecules 40 corresponding to the three pixel regions of the main pixel portion 10, the first sub-pixel portion 20, and the second sub-pixel portion 30 have different light transmittances from each other.
Further, the ratio of the area of the main pixel portion 10 to the area of the second sub-pixel portion 30 is 1: 1, and the ratio of the area of the main pixel portion 10 to the sum of the areas of the first sub-pixel portion 20 and the second sub-pixel portion 30 is 2: 3.
In this embodiment, the areas of the main pixel portion 10 and the second sub-pixel portion 30 are the same, the area of the second sub-pixel portion 30 is half of the area of the first sub-pixel portion 20, and it is mainly considered that the first sub-pixel portion 20 is located between the main pixel portion 10 and the second sub-pixel portion 30, so that the distance between the main pixel portion 10 and the second sub-pixel portion 30 is relatively long, and by setting the areas of the main pixel portion 10 and the second sub-pixel portion 30 to be larger than the area of the first sub-pixel portion 20, the color shift problem of the display panel under a wide viewing angle is favorably improved, and the color shift under the wide viewing angle is ensured to be reduced as much as possible. Through research and experiments of researchers, when the ratio of the area of the main pixel part 10 to the area of the second sub-pixel part 30 is set to be 1: 1, and the ratio of the area of the main pixel part 10 to the sum of the areas of the first sub-pixel part 20 and the second sub-pixel part 30 is set to be 2: 3, the pixel unit has a better effect of improving color cast. Therefore, the present invention takes this value as a preferred embodiment. Needless to say, the sizes of the area of the main pixel unit 10, the area of the first sub-pixel unit 20, and the area of the second sub-pixel unit 30 are not limited to these.
Further, the present embodiment may arrange the scan line 70 between the main pixel portion 10 and the first sub-pixel portion 20, which is beneficial to the array arrangement of the thin film transistor 50 and the pixel unit.
The present invention further provides a display panel, comprising: the first substrate is provided with a plurality of data lines, scanning lines and a plurality of pixel units limited by the data lines and the scanning lines, the pixel units are the pixel units, each pixel unit is correspondingly provided with a thin film transistor, and the data lines, the scanning lines and the pixel units are electrically connected with the thin film transistors; the second substrate is arranged opposite to the first substrate and is provided with a common electrode corresponding to the pixel unit; and a liquid crystal 40 layer filled between the first substrate and the second substrate.
The data lines 60(data) and the scan lines 70(gate) are arranged to intersect vertically, thereby defining a plurality of pixel units arranged in an array, and the pixel units are covered on the common electrode lines 80(Acom) to form storage capacitors. The tft 50 functions as a three-terminal switch, the data line 60 charges and discharges to the pixel unit through the tft 50, and the scan line 70 controls the conductivity of the tft 50. The pixel unit is preferably made of a light-transmitting conductive material, such as ITO (indium tin oxide), IZO (indium zinc oxide), and the specific structure of the pixel unit refers to the pixel unit of the above embodiments.
The display panel also comprises a first polaroid and a second polaroid, wherein the first polaroid is arranged at the outer side of the first substrate, namely the light incident side of the first substrate; the second polarizer is arranged on the outer side of the second substrate, namely the light-emitting side of the second substrate.
Specifically, the substrate material of the first substrate and the second substrate may be a glass substrate or a flexible plastic substrate. For example, the first substrate may be a glass substrate with a matrix of thin film transistors 50 or a substrate of other material, and the second substrate may be a glass substrate with a color filter or a substrate of other material.
The invention further provides a display device, which comprises the display panel and a backlight module, wherein the backlight module is used for providing backlight to the display panel. The specific structure of the display panel refers to the display panel of the above embodiment, and since the display device adopts all the technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
The backlight module can be an edge type backlight module or a direct type light incidence backlight module to provide backlight to the display panel.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A pixel cell, comprising:
a main pixel part including a plurality of first sub-pixel electrodes arranged at intervals;
a sub-pixel section including at least:
a first sub-pixel part including a plurality of second sub-pixel electrodes arranged at intervals;
a second sub-pixel section: the second sub-pixel part comprises a plurality of third sub-pixel electrodes which are arranged at intervals;
the main pixel part, the first sub-pixel part and the second sub-pixel part are connected into a whole, and the arrangement structures of the first sub-pixel electrode, the second sub-pixel electrode and the third sub-pixel electrode are different from each other, so that electric fields formed on the main pixel part, the first sub-pixel part and the second sub-pixel part have different electric field strengths and/or electric field directions.
2. The pixel cell of claim 1, wherein the first subpixel electrode has a first width, the second subpixel electrode has a second width, the third subpixel electrode has a third width, and the first width, the second width, and the third width are different from each other.
3. The pixel unit according to claim 2, wherein a first pitch is formed between two adjacent first sub-pixel electrodes, a second pitch is formed between two adjacent second sub-pixel electrodes, a third pitch is formed between two adjacent third sub-pixel electrodes, and the first pitch, the second pitch, and the third pitch are not equal to each other.
4. The pixel cell of claim 3, wherein a ratio of the first width to the first pitch, a ratio of the second width to the second pitch, and a ratio of the third width to the third pitch decrease in order.
5. The pixel unit according to claim 1, wherein a first angle is formed between the first sub-pixel electrode and the extending direction of the scan line, a second angle is formed between the second sub-pixel electrode and the extending direction of the scan line, a third angle is formed between the third sub-pixel electrode and the extending direction of the scan line, and the first angle, the second angle and the third angle are not equal to each other.
6. The pixel cell of claim 5, wherein the first angle, the second angle, and the third angle are sequentially increasing in difference from 45 °.
7. The pixel cell of claim 1, wherein a ratio of an area of the primary pixel portion to a sum of areas of the first secondary pixel portion and the second secondary pixel portion is less than 1: 1 and greater than 2: 3.
8. the pixel unit according to any one of claims 1 to 4, wherein the main pixel portion further comprises a first main pixel electrode in a cross shape, the first main pixel electrode divides the main pixel portion into four main display domains, the first sub-pixel electrodes extend from the first main pixel electrode in different directions, and the first sub-pixel electrodes in the same main display domain extend in the same direction; and/or the presence of a gas in the atmosphere,
the first sub-pixel part also comprises a second cross-shaped main pixel electrode which divides the first sub-pixel part into four first sub-display domains, the second sub-pixel electrodes extend from the second main pixel electrode along different directions, and the extending directions of the second sub-pixel electrodes in the same first sub-display domain are the same; and/or the presence of a gas in the atmosphere,
the second sub-pixel part further comprises a cross-shaped third main pixel electrode, the second sub-pixel part is divided into four second sub-display domains by the third main pixel electrode, the third sub-pixel electrode extends from the third main pixel electrode along different directions, and the extending directions of the third sub-pixel electrodes in the second sub-display domains are the same.
9. A display panel, comprising:
a first substrate provided with a plurality of data lines and scanning lines and a plurality of pixel units defined by the data lines and the scanning lines, wherein the pixel units are the pixel units as claimed in any one of claims 1 to 8, each pixel unit is provided with a corresponding thin film transistor, and the data lines, the scanning lines and the pixel units are all electrically connected with the thin film transistors;
the second substrate is arranged opposite to the first substrate and is provided with a common electrode corresponding to the pixel unit; and
and the liquid crystal layer is filled between the first substrate and the second substrate.
10. A display device comprising the display panel of claim 9 and a backlight module for providing backlight to the display panel.
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