CN102809843B - Liquid crystal panel and transflective liquid crystal display - Google Patents
Liquid crystal panel and transflective liquid crystal display Download PDFInfo
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- CN102809843B CN102809843B CN201210279727.9A CN201210279727A CN102809843B CN 102809843 B CN102809843 B CN 102809843B CN 201210279727 A CN201210279727 A CN 201210279727A CN 102809843 B CN102809843 B CN 102809843B
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Abstract
The invention provides a liquid crystal panel. A liquid crystal layer is arranged in the liquid crystal panel, the liquid crystal panel is provided with a plurality of pixel areas, each pixel area comprises at least one sub-pixel area, each sub-pixel area comprises a transmission area and a reflection area, a first electric field is formed in each transmission area, a second electric field is formed in each reflection area, and an effective refractive index of liquid crystal of each transmission area under the effect of the corresponding first electric field is higher than a refractive index of liquid crystal of the corresponding reflection area under the effect of the corresponding second electric field. Chromatic aberration between the transmission areas and the reflection areas of the liquid crystal panel is low and colors of the transmission areas and the reflection areas of the liquid crystal panel are matched under the condition that the thicknesses of liquid crystal boxes of the transmission areas and the thicknesses of liquid crystal boxes of the reflection areas are equal, display quality of the liquid crystal display is improved, and a manufacturing process of the liquid crystal panel is simplified.
Description
Technical field
The invention belongs to technical field of liquid crystal display, relate to a kind of liquid crystal panel and comprise the transflective liquid crystal display of this liquid crystal panel.
Background technology
At present, liquid crystal display (Liquid Crystal Display: be called for short LCD) becomes the main product on market with the performance of its excellence and proven technique.Liquid crystal display is classified according to light source type, can be divided into transmission-type (transmissive), reflective (reflective) and Transflective (transflective, also referred to as half-transmission half-reflection type).Wherein, transflective liquid crystal display combines the advantage of reflective liquid-crystal display and transmissive type liquid crystal display, has both been suitable for, in indoor use, being also suitable in outdoor application, being therefore widely used in Portable mobile electronic device.
Liquid crystal panel is the critical component in liquid crystal display, and liquid crystal panel forms box primarily of color membrane substrates and array base palte, filling liquid crystal between described color membrane substrates and array base palte and form liquid crystal cell.The liquid crystal panel of existing transflective liquid crystal display has multiple pixel region, and described each pixel region comprises multiple pixel regions, and each described pixel region comprises transmission area and echo area.When transflective liquid crystal display is in reflective mode operation, enter the light twice of echo area through echo area, and when transflective liquid crystal display is in transmissive mode of operation, enter the light of transmission area only once through transmission area, like this, just cause the light that in transflective liquid crystal display, different light sources sends under different working modes different from transmission area light path (light path) in echo area, make the aberration of transmission area and echo area under different working modes comparatively large, cause the image shown in transflective liquid crystal display to occur the inharmonic situation of color.
The problems referred to above Producing reason be echo area and the light in transmission area due to light path different and the phase-delay quantity of liquid crystal is not mated.In order to improve the inharmonic phenomenon of color, at present, liquid crystal panel in transflective liquid crystal display adopts dual-box thick line space design mode usually, even if the box of the liquid crystal cell of corresponding echo area is thick is the half that the box of the liquid crystal cell of corresponding transmission area is thick, equal (namely with the phase-delay quantity of the liquid crystal of the phase-delay quantity with transmission area that ensure the liquid crystal of echo area, both phase-delay quantities are mated), thus can ensure that the aberration of transmission area and echo area is less and matching in color.But there is the thick difference of box due to liquid crystal cell in the liquid crystal display of this structure, cause the complex manufacturing technology of liquid crystal panel, the thick homogeneity of box is wayward, and intersection in echo area and transmission area may make liquid crystal molecule produce deformity because of the thick difference of liquid crystal cell box, thus causing the liquid crystal display dark-state light leak adopting normal black display mode serious, the homogeneity of on state of picture is deteriorated.
Summary of the invention
Technical matters to be solved by this invention is for transflective liquid crystal display above shortcomings in prior art, a kind of liquid crystal panel is provided and comprises the transflective liquid crystal display of this liquid crystal panel, this liquid crystal panel when ensure the liquid crystal cell box of transmission area and echo area thick equal, the aberration of transmission area and echo area can be made less and matching in color, effectively improve the display quality of liquid crystal display, also simplify the manufacture craft of liquid crystal panel.
For solving technical matters of the present invention, the invention provides a kind of liquid crystal panel, liquid crystal layer is included in described liquid crystal panel, this liquid crystal panel has multiple pixel region, described each pixel region comprises at least one pixel region, each described pixel region comprises transmission area and echo area, the first electric field is provided in described transmission area, the second electric field is provided in described echo area, the effective refractive index of the liquid crystal of the described transmission area under the effect of described first electric field is greater than the effective refractive index of the liquid crystal of the described echo area under the effect of described second electric field.
Wherein, liquid crystal molecule in liquid crystal panel has deflection to a certain degree under electric field action, thus the light therethrough liquid crystal that backlight is sent be radiated on screen and form image, or the light therethrough liquid crystal reflection that the external world is sent forms image on screen.In the present invention, effective refractive index refers to the component of the refractive index of liquid crystal molecule on the direction, plate face being parallel to liquid crystal panel.Due in technical field of liquid crystal display, the fundamental property of liquid crystal and be the basis of liquid crystal display imaging with the principle that voltage deflects, belongs to the common practise of those skilled in the art, therefore repeats no more here.
Due to the phase-delay quantity=effective refractive index × actual light path of liquid crystal, in prior art, transmission area is different with the phase-delay quantity of the liquid crystal of echo area, mainly because light path difference causes, owing to entering the light of transmission area only once through transmission area, and the light twice entering echo area is through echo area, that is, the actual light path entering the light of transmission area enters the half of the actual light path of the light of echo area often, namely the difference under two kinds of different working modes between actual light path is fixed value, as long as the corresponding effective refractive index changing liquid crystal, difference between the phase-delay quantity that just can reduce liquid crystal under different working modes, until make the phase delay of the liquid crystal of transmission area and echo area flux matched.
Preferred a kind of scheme is, described first electric field is transverse horizontal electric field, the direction of an electric field of described transverse horizontal electric field is parallel with the direction, plate face of described liquid crystal panel, described second electric field is tilting electric field, has pitch angle between the direction of an electric field of described tilting electric field and the direction, plate face of described liquid crystal panel.
Preferably, described transverse horizontal electric field is provided by the first public electrode and the first pixel electrode being arranged on described liquid crystal layer the same side, and described first public electrode and the first pixel electrode be arranged in parallel; Described tilting electric field is provided by the second public electrode and the second pixel electrode being separately positioned on described liquid crystal layer both sides, and described second public electrode and the second pixel electrode be arranged in parallel but orthogonal projection on described liquid crystal panel offsets one from another.
Preferably, described liquid crystal panel comprises the color membrane substrates and array base palte that are oppositely arranged, the color filter that described color membrane substrates comprises first substrate and arranges on the first substrate, described second public electrode is arranged on described color filter, described array base palte comprises second substrate, on described second substrate, the part of corresponding echo area is provided with reflection horizon, described first public electrode and the first pixel electrode are arranged on the part of corresponding transmission area on second substrate, and described second pixel electrode is arranged on described reflection horizon.
More preferably, described first public electrode, the second public electrode, the first pixel electrode and the second pixel electrode respectively comprise multiple strip shaped electric poles, multiple strip shaped electric poles in described first public electrode and the multiple strip shaped electric poles interval successively in the first pixel electrode, multiple strip shaped electric poles in described second public electrode and the multiple strip shaped electric poles in the second pixel electrode orthogonal projection interval successively on liquid crystal panel, and the shape and size of these strip shaped electric poles are all identical, namely the length of all strip shaped electric poles, width are all identical with the size of thickness.
Further preferably, arbitrary strip shaped electric poles in described first public electrode is all identical with the interval width between the strip shaped electric poles in its first adjacent pixel electrode and be d1, interval width between adjacent two strip shaped electric poles in described second public electrode and the interval width between adjacent two strip shaped electric poles in described second pixel electrode all identical and be d2, and d1<d2.
Preferably, the scope of d1 is the scope of 2-7 μm, d2 is 5-10 μm.
Preferably, the field intensity of described first electric field is less than or equal to the field intensity of described second electric field.
Further preferably, described first public electrode is equal with the voltage that described second public electrode applies, and described first pixel electrode is equal with the voltage that described second pixel electrode applies; Or described first public electrode is equal with the voltage that described second public electrode applies, and the voltage that described first pixel electrode applies is less than the voltage that described second pixel electrode applies.
Preferably, also flatness layer is included in described array base palte, described flatness layer is arranged on second substrate, the thickness that the thickness of flatness layer is greater than described reflection horizon can be embedded in described flatness layer to make described reflection horizon, and described first public electrode, the first pixel electrode and the second pixel electrode are all arranged on flatness layer.
Preferably, described color membrane substrates is provided with the first polaroid away from the side of liquid crystal layer, and described array base palte is provided with the second polaroid away from the side of liquid crystal layer, the light transmission shaft of described first polaroid and the light transmission shaft of the second polaroid orthogonal, described first substrate is provided with second phase retardation plate and first phase retardation plate successively away from the side of liquid crystal layer, described second phase retardation plate and first phase retardation plate are arranged between first substrate and the first polaroid, described second substrate is provided with third phase retardation plate and the 4th phase delay chip successively away from the side of liquid crystal layer, described third phase retardation plate and the 4th phase delay chip are arranged between second substrate and the second polaroid, the optical axis direction of described second phase retardation plate and third phase retardation plate is orthogonal, the optical axis direction of first phase retardation plate and the 4th phase delay chip is orthogonal.
Further preferably, described second phase retardation plate and described third phase retardation plate adopt quarter-wave plate, and described first phase retardation plate and described 4th phase delay chip adopt 1/2nd wave plates.
Preferably, described liquid crystal adopts blue phase liquid crystal; Or, described liquid crystal also can adopt positivity liquid crystal, then also include the first oriented layer with a side contacts of liquid crystal layer in described color membrane substrates, also include the second oriented layer contacted with the opposite side of liquid crystal layer in described array base palte, the direction of orientation of described first oriented layer and the direction of orientation of the second oriented layer orthogonal.
Preferably, the thickness of part of the corresponding described echo area of described liquid crystal layer is equal with the thickness of the part of corresponding transmission area, and the effective refractive index of the liquid crystal in the described transmission area under the effect of described first electric field is 2 times of the effective refractive index of liquid crystal in the described echo area under the effect of described second electric field.
Present invention also offers a kind of transflective liquid crystal display, the driving circuit comprising liquid crystal panel and be connected with described liquid crystal panel, wherein, described liquid crystal panel adopts above-mentioned liquid crystal panel.
The invention has the beneficial effects as follows: the present invention is changed by the effective refractive index of the liquid crystal to transmission area in liquid crystal panel and echo area, the coupling of the phase-delay quantity of the liquid crystal of transmission area and echo area can be ensured, therefore thick without the need to changing the box of liquid crystal cell in liquid crystal panel, when thickness of liquid crystal layer is consistent, greatly can simplify the manufacture craft of liquid crystal panel, also improve the display quality of transflective liquid crystal display simultaneously.
Accompanying drawing explanation
Fig. 1 be in the embodiment of the present invention 1 liquid crystal panel not making alive time schematic diagram;
Schematic diagram when Fig. 2 is liquid crystal panel applying voltage in the embodiment of the present invention 1;
Fig. 3 be in the embodiment of the present invention 3 liquid crystal panel not making alive time schematic diagram;
Schematic diagram when Fig. 4 is liquid crystal panel applying voltage in the embodiment of the present invention 3.
In figure: 1-first polaroid; 2-first phase retardation plate; 3-second phase retardation plate; 4-first substrate; 5-first public electrode; 5 '-the second public electrode; 6-liquid crystal; 7-first pixel electrode; 7 '-the second pixel electrode; 8-reflection horizon; 9-third phase retardation plate; 10-the 4th phase delay chip; 11-second polaroid; 12-second substrate; 13-flatness layer; 14-first oriented layer; 15-second oriented layer.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, liquid crystal panel of the present invention and transflective liquid crystal display are described in further detail.
Embodiment 1:
In the present embodiment, described liquid crystal panel inside includes liquid crystal layer, described liquid crystal panel has multiple pixel region, described each pixel region comprises at least one pixel region, described time pixel region comprises transmission area and echo area, wherein, the first electric field is provided in described transmission area, provide the second electric field in described echo area, the effective refractive index of the liquid crystal of the described transmission area under the effect of described first electric field is greater than the effective refractive index of the liquid crystal of the described echo area under the effect of described second electric field.Preferably, in the present embodiment, the thickness of part of the corresponding described echo area of described liquid crystal layer is equal with the thickness of the part of corresponding transmission area, namely the thickness of liquid crystal cell is even, and the effective refractive index of the liquid crystal in the described transmission area under the effect of described first electric field is 2 times of the effective refractive index of liquid crystal in the described echo area under the effect of described second electric field.
In the present embodiment, because the box of the liquid crystal cell in described liquid crystal panel is evenly thick, the therefore simple and dark-state light leak under avoiding normal black display mode of the manufacture craft of this liquid crystal panel.Preferably, the thick scope of the box of described liquid crystal cell is 2-10 μm.
As shown in Figure 1, 2, in the present embodiment, described first electric field is transverse horizontal electric field, the direction of an electric field of described transverse horizontal electric field is parallel with the direction, plate face of described liquid crystal panel, described second electric field is tilting electric field, has pitch angle between the direction of an electric field of described tilting electric field and the direction, plate face of described liquid crystal panel.In general, when the long axis direction of liquid crystal is parallel with the direction, plate face of liquid crystal panel, the effective refractive index of liquid crystal is maximum.Under the effect of transverse horizontal electric field, the long axis direction of liquid crystal can be made parallel with direction of an electric field, so time liquid crystal effective refractive index maximum.For tilting electric field, because the long axis direction of liquid crystal and the direction, plate face of liquid crystal panel exist angle, thus its effective refractive index is this electric field force component in the horizontal direction.Therefore, the effective refractive index of liquid crystal under transverse horizontal electric field action is greater than the effective refractive index of liquid crystal under tilting electric field effect.
As shown in Figure 1, 2, in the present embodiment, described transverse horizontal electric field is provided by the first public electrode 5 and the first pixel electrode 7 being arranged on described liquid crystal cell the same side, described first public electrode 5 and the first pixel electrode 7 are set in parallel in described transmission area, and the first public electrode 5 and the first pixel electrode 7 can comprise at least one strip shaped electric poles be arranged in parallel respectively.When the first public electrode 5 and the first pixel electrode 7 comprise multiple strip shaped electric poles be arranged in parallel respectively, the multiple strip shaped electric poles in described first public electrode and the multiple strip shaped electric poles in the first pixel electrode are disposed on same plane successively.Described tilting electric field is provided by the second public electrode 5 ' and the second pixel electrode 7 ' being separately positioned on described liquid crystal cell both sides, described second public electrode 5 ' and the second pixel electrode 7 ' are set in parallel in described echo area, described second public electrode 5 ' and the second pixel electrode 7 ' comprise multiple strip shaped electric poles be arranged in parallel respectively, and the orthogonal projection of each strip shaped electric poles on liquid crystal panel of the second public electrode 5 ' and the second pixel electrode 7 ' is interlaced with each other.Such as, the arbitrary strip shaped electric poles in described second public electrode 5 ' and the position between two adjacent stripe-like electrode in described second pixel electrode 7 ' corresponding; Or, the arbitrary strip shaped electric poles in described second pixel electrode 7 ' also can be made corresponding with the position between the adjacent stripe-like electrode of two in the second public electrode 5 '.
In the present embodiment, described liquid crystal panel comprises the color membrane substrates and array base palte that are oppositely arranged, the color filter (not shown) that described color membrane substrates comprises first substrate 4 and is arranged on first substrate 4, multiple strip shaped electric poles in described second public electrode 5 ' are set in parallel on described color filter, the flatness layer 13 that described array base palte comprises second substrate 12 and is arranged on second substrate 12.On second substrate 12, the part of corresponding echo area is also provided with reflection horizon 8, and the thickness due to flatness layer 13 is greater than the thickness in reflection horizon 8, and therefore reflection horizon 8 is embedded in flatness layer 13.Multiple strip shaped electric poles in multiple strip shaped electric poles in first public electrode 5 and the first pixel electrode 7 are disposed on flatness layer 13 successively, and the multiple strip shaped electric poles in the second pixel electrode 7 ' are set in parallel on reflection horizon 8.
Namely, because the first public electrode 5 and the first pixel electrode 7 are arranged on (on flatness layer 13) in same plane, and the first public electrode 5 and the first pixel electrode 7 form transverse horizontal electric field, namely, the present embodiment liquid crystal panel forms the electrode structure of similar lateral electric field mode in transmission area, described lateral electric field mode is such as but not limited to being IPS(In-Plane Switching, and in-plane changes) pattern.Second public electrode 5 ' and the second pixel electrode 7 ' are arranged in different planes, and the second public electrode 5 ' and the second pixel electrode 7 ' form described tilting electric field.
In the present embodiment, the shape and size of the strip shaped electric poles in the first public electrode 5, second public electrode 5 ', the first pixel electrode 7 and the second pixel electrode 7 ' are all identical, and namely the length of each strip shaped electric poles is equal, width is equal, thickness is equal.
Wherein, in the first public electrode 5, the interval width often between adjacent two strip shaped electric poles is equal; In the first pixel electrode 7, the interval width often between adjacent two strip shaped electric poles is equal; And interval width between strip shaped electric poles in the first pixel electrode 7 of being adjacent of the arbitrary strip shaped electric poles in the first public electrode 5 is equal.In the second public electrode 5 ', the interval width often between adjacent two strip shaped electric poles is equal; In the second pixel electrode 7 ', the interval width often between adjacent two strip shaped electric poles is equal; Interval width between adjacent two strip shaped electric poles in described second public electrode 5 ' is equal with the interval width between two strip shaped electric poles adjacent in the second pixel electrode 7 '.In the present embodiment, the arbitrary strip shaped electric poles in the second public electrode 5 ' is corresponding with the midline position between the adjacent stripe-like electrode of two in the second pixel electrode 7 '.
Arbitrary strip shaped electric poles in described first public electrode is all identical with the interval width between the strip shaped electric poles in its first adjacent pixel electrode and be d1, interval width between adjacent two strip shaped electric poles in described second public electrode and the interval width between adjacent two strip shaped electric poles in described second pixel electrode all identical and be d2, and d1<d2.
Because the length of each strip shaped electric poles is much larger than its width and interval width thereof, therefore can think that the first electric field that the first public electrode 5 and the first pixel electrode 7 are formed and the second electric field that the second public electrode 5' and the second pixel electrode 7' is formed are all equally distributed, if ignore the rim effect of electric field, can think that the distribution of electric field is period profile along strip shaped electric poles orientation.By optimizing d1 and d2, the first electric field can be changed and from the second electric field, different deflecting actions is produced to liquid crystal, thus making liquid crystal produce different effective refractive indexs, the phase-delay quantity of the liquid crystal of transmission area and echo area finally can be made to reach coupling.In embody rule process, by many experiments, by selecting different d1 and d2, obtain the experimental data of the phase-delay quantity of liquid crystal in many group transmission areas and echo area, the experimental data of preferably d1 and d2 is selected from above-mentioned experimental data, this group experimental data can make the display effect of liquid crystal display better, that is, the phase-delay quantity of the liquid crystal in transmission area and echo area can be made more to mate.Preferably, the scope of d1 is the scope of 2-7 μm, d2 is 5-10 μm.In the present embodiment, selected d1 is 4 μm, and d2 is 8 μm.By above-mentioned setting, the effective refractive index of the liquid crystal in transmission area can be made to be 2 times of the effective refractive index of liquid crystal in echo area.
Wherein, the electric field intensity of described first electric field is equal with the electric field intensity of the second electric field, or the electric field intensity of the first electric field also can be less than the electric field intensity of the second electric field.In the present embodiment, concrete, can make at the first public electrode 5 equal with the voltage that the second public electrode 5 ' applies, make the upper voltage applied of the first pixel electrode 7 and the second pixel electrode 7 ' equal.
In the present embodiment, described color membrane substrates is provided with the first polaroid 1 away from the side of liquid crystal layer, and described array base palte is provided with the second polaroid 11 away from the side of liquid crystal layer, wherein the light transmission shaft of the first polaroid 1 and the light transmission shaft of the second polaroid 11 orthogonal.Described first substrate 4 is provided with second phase retardation plate 3 and first phase retardation plate 2 successively away from the side of liquid crystal layer, described second phase retardation plate 3 and first phase retardation plate 2 are arranged between first substrate 4 and the first polaroid 1, described second substrate is provided with third phase retardation plate 9 and the 4th phase delay chip 10 successively away from the side of liquid crystal layer, and described third phase retardation plate 9 and the 4th phase delay chip 10 are arranged between second substrate 12 and the second polaroid 11.Wherein, described second phase retardation plate 3 and third phase retardation plate 9 adopt quarter-wave plate, and the optical axis direction of second phase retardation plate 3 and third phase retardation plate 9 is orthogonal, for generation of polarized light; First phase retardation plate 2 and the 4th phase delay chip 10 adopt 1/2nd wave plates, and the optical axis direction of first phase retardation plate 2 and the 4th phase delay chip 10 is orthogonal, are conducive to expanding angular field of view.
The light transmission shaft direction setting the second polaroid 11 is 0 °, the optical axis direction of the 4th phase delay chip 10 is 15 °, the optical axis direction of third phase retardation plate 9 is 75 °, the optical axis direction of second phase retardation plate 3 is-15 °, the optical axis direction of first phase retardation plate 2 is-75 °, and the light transmission shaft direction of the first polaroid 1 is 90 °.
In the present embodiment, the liquid crystal 6 of filling between color membrane substrates and array base palte adopts blue phase liquid crystal.Wherein, indigo plant is a kind of a kind of liquid crystal phase between isotropy state and cholesteric phase mutually, due to the stabilizing polymer of blue phase liquid crystal, when not by electric field action, blue phase liquid crystal is isotropy state, therefore blue phase liquid crystal is applied in display, this liquid crystal display can be made to have visual angle large, the feature that dark-state is good; Meanwhile, due to its isotropic feature, the oriented layer (i.e. alignment film) making this liquid crystal display not need the liquid crystal display of other types must to adopt, thus reduce manufacturing cost, simplify manufacturing process.And, adopt the theoretical response time of the liquid crystal display of blue phase liquid crystal to reach below Millisecond, thus improve the response time greatly.Therefore, adopt the liquid crystal display of blue phase liquid crystal to have higher contrast, faster response time and wider viewing visual angle than common liquid crystal display, improve the display quality of liquid crystal display greatly; But there is the shortcoming that driving voltage is relatively high, optical efficiency is lower in the liquid crystal display of such type.
The job analysis of the present embodiment liquid crystal panel is as follows:
Fig. 1 be in the present embodiment transreflective liquid crystal panel not making alive time schematic diagram.Because blue phase liquid crystal is when not making alive, optically isotropy state, as shown in Figure 1, now the shape of blue phase liquid crystal is circular.Can not produce phase-delay quantity by the light of transmission area and echo area at the blue phase liquid crystal through isotropy state, the polarization direction of light light after liquid crystal layer of vertical incidence can not change, and is blocked completely, realize dark-state by the first polaroid 1.
Schematic diagram when Fig. 2 is liquid crystal panel applying voltage in the present embodiment.The voltage applied due to the first public electrode 5 and the second public electrode 5' is equal, and the first pixel electrode 7 is equal with the voltage that the second pixel electrode 7' applies.In transmission area, owing to have employed the electrode structure of similar lateral electric field mode, namely the first public electrode 5 and the first pixel electrode 7 are distributed on flatness layer 13, and be substantially in same plane, therefore when applying voltage in liquid crystal panel, first public electrode 5 and the first pixel electrode 7 form transverse horizontal electric field, the i.e. electric field line of this electric field basic direction, plate face along being parallel to this liquid crystal panel except electrode rim region, namely along the plate face directional spreding of first substrate 4 and second substrate 12, blue phase liquid crystal molecule under horizontal component of electric field effect along electric field line direction horizontal distribution, its long axis direction is identical with electric field line direction, refractive index due to long axis direction is maximum and the refractive index of short-axis direction is minimum, now the effective refractive index of liquid crystal is maximum, namely when light path is identical, now liquid crystal produces maximum (horizontal direction) phase-delay quantity, the phase-delay quantity of this horizontal direction and effective phase-delay quantity of liquid crystal.In echo area, because the second public electrode 5' and the second pixel electrode 7' is separately positioned on first substrate 4 with on flatness layer 13, namely be in two relative planes and position both respectively to intermesh, therefore when liquid crystal panel applies voltage, second public electrode 5' and the second pixel electrode 7' forms tilting electric field, its electric field line relative to liquid crystal panel plate face direction tilt distribution and form pitch angle, blue phase liquid crystal molecule under tilting electric field effect along electric field line directional spreding, its long axis direction identical with direction of an electric field and with the plate face shape of liquid crystal panel in an angle, now to be crystal molecule refractive index be parallel to the component of horizontal direction of liquid crystal panel to the effective refractive index of liquid crystal, this effective refractive index is between the largest refractive index and minimum refractive index of liquid crystal, accordingly, now liquid crystal produces phase-delay quantity, the horizontal component of the phase-delay quantity of this vergence direction and effective phase-delay quantity of liquid crystal of vergence direction.In the present embodiment, actual light path due to the light of echo area is 2 times of the actual light path of the light of transmission area, by arranging the interval width in transmission area between the first public electrode and the first pixel electrode, and the interval width in echo area between the second public electrode and the second pixel electrode, the effective refractive index of liquid crystal in transmission area can be made to be 2 times of the effective refractive index of liquid crystal in echo area, due to phase-delay quantity=effective refractive index × actual light path, therefore make the phase-delay quantity of the liquid crystal of transmission area and echo area equal, thus make transmitance region and echo area flux matched through the phase delay after liquid crystal.
Concrete, execute in the alive course of work at liquid crystal panel, blue phase liquid crystal presents optical anisotropy state, the blue phase liquid crystal of transmission area long axis electric field line direction and be rendered as horizontal arrangement under the effect of transverse horizontal electric field, and the effective refractive index of blue phase liquid crystal is △ n1; And the long axis electric field line direction arrangement under the effect of tilting electric field of the blue phase liquid crystal of echo area, blue phase liquid crystal effective refractive index is in the horizontal direction △ n2, by optimize transmission area each electrode between interval width and each electrode of echo area between interval width (i.e. d1 and d2), △ n1=2* △ n2 can be made.Meanwhile, due in the liquid crystal panel of transflective liquid crystal display, the light entering echo area passes twice through echo area, so the actual light path D2 entering the light of echo area is 2 times of the actual light path D1 of the light of transmission area, i.e. and D2=2*D1.Account form according to the phase-delay quantity of liquid crystal in liquid crystal panel: in transmission area, blue phase liquid crystal produces effective phase-delay quantity of horizontal direction under the effect of transverse horizontal electric field, when light effective phase-delay quantity that this blue phase liquid crystal produces after this blue phase liquid crystal of vertical incidence is △ n1*D1, and in echo area, blue phase liquid crystal produces the phase-delay quantity of vergence direction under the effect of tilting electric field, effective phase-delay quantity of light horizontal direction that this blue phase liquid crystal produces after this blue phase liquid crystal of vertical incidence is △ n2*D2, can know by inference according to above-mentioned △ n1=2* △ n2 and D2=2*D1, the phase-delay quantity of the liquid crystal of transmission area and echo area may ultimately reach equal, namely the present embodiment is different by the interval width (namely optimize d1 and d2) between the interval width between each electrode of optimizing the transmission area of liquid crystal panel and each electrode of echo area, the liquid crystal of transmission area and echo area can be made to produce equal phase-delay quantity respectively, namely, both phase-delay quantities are mated, thus finally can improve the display effect of transflective liquid crystal display.
Under above-mentioned working method, due to each time, pixel region includes transmission area and echo area, so the inclined in two-way form that the liquid crystal of echo area is formed with electric field line distribution (liquid crystal as shown in Figure 2 presents the mode that left low right height and right low left high are intervally arranged in the horizontal direction), can the display view angle in spread reflection district, the also corresponding display view angle expanding whole liquid crystal display.
The invention has the beneficial effects as follows, because liquid crystal panel in the present embodiment have employed said structure in transmission area and echo area, make that the driving voltage of the liquid crystal display in the present embodiment reduces relatively, optical efficiency and light transmission rate be also improved, and expand the angular field of view of liquid crystal display.
Embodiment 2:
The difference of the present embodiment and embodiment 1 is, the present embodiment is except the numerical value of interval width d1 and d2 of the transmission area of liquid crystal panel and the electrode of echo area is different from embodiment 1, also the electric field intensity of transmission area and echo area is adjusted, with the electric field intensity making the electric field intensity of the first electric field be less than the second electric field.Namely by the interval width between the interval width between each electrode of transmission area and each electrode of echo area is set to difference, and the electric field intensity of the electric field of transmission area and echo area is set to difference, thus the liquid crystal of transmission area and echo area can be made to produce equal phase-delay quantity respectively simultaneously.
Because the interval width between the strip shaped electric poles in the first pixel electrode is d1, the interval width set in interval width in described second public electrode often between adjacent two strip shaped electric poles and described second pixel electrode often between adjacent two strip shaped electric poles is d2, in the present embodiment, arranging d1 is 6 μm, and d2 is 8 μm.
Meanwhile, in liquid crystal panel, voltage that the first public electrode 5 of transmission area and the second public electrode 5' of echo area apply can be made equal, but the voltage that the second pixel electrode 7' of the first pixel electrode 7 of transmission area and echo area applies is unequal.Wherein, the voltage swing the second pixel electrode 7' applied is about the 1-5 of the voltage swing that transmission area first pixel electrode 7 applies doubly.Concrete, in the present embodiment, the voltage swing that the second pixel electrode 7' applies is about 3 times of the voltage swing that the first pixel electrode 7 applies.
To reach the object of △ n1=2* △ n2 in embodiment 1 by means of only the spacing width of each electrode optimized in transmission area and echo area, and the present embodiment reaches the object (logical superpotential change reaches the change of electric field intensity) of △ n1=2* △ n2 except the spacing width by arranging electrode, the change in voltage that also applies by optimizing the transmission area of liquid crystal panel and the not same electric field of echo area simultaneously, thus the phase-delay quantity of the liquid crystal in transmission area and echo area is finally made to be mated.
Like this, execute in the alive course of work at liquid crystal panel, blue phase liquid crystal long axis electric field line direction arrangement under the effect of the horizontal component of electric field of transverse direction of transmission area, the effective refractive index of blue phase liquid crystal is △ n1; And the long axis electric field line direction arrangement under the effect of tilting electric field of the blue phase liquid crystal of echo area, now, the electric field force of tilting electric field is greater than the electric field force of the tilting electric field in examples of implementation 1, namely the field intensity of tilting electric field is greater than the field intensity of the tilting electric field in embodiment 1, tilting electric field and the angle of horizontal direction are more than or equal to angle of inclination in embodiment 1 (the angle of inclination greatly then horizontal component of liquid crystal and effective refractive index can reduce relatively), and the effective refractive index of blue phase liquid crystal is △ n2.By arranging the interval width of each electrode in transmission area and echo area, and changing the voltage swing that the first pixel electrode and the second pixel electrode apply, making △ n1=2* △ n2; D2=2*D1 is had equally in the present embodiment.Analytic process with reference to embodiment 1 is known, by above-mentioned setting, the phase-delay quantity of the liquid crystal of transmission area and echo area in the present embodiment can be made equal, and reach the effect of the display effect of final optimization pass transflective liquid crystal display.
In the present embodiment, other structures of liquid crystal panel are all identical with embodiment 1, repeat no more here.
Embodiment 3:
The difference of the present embodiment and embodiment 1 is, the liquid crystal 6 in the present embodiment in liquid crystal panel adopts positivity liquid crystal, thus needs to arrange oriented layer accordingly in color membrane substrates and array base palte.Identical with embodiment 1 is, the electrode structure changing transmission area and echo area in liquid crystal panel is make use of equally in the present embodiment, make the effective refractive index of liquid crystal molecule change thus reach the method making the phase delay of liquid crystal flux matched, what in the present embodiment, effective refractive index referred to be still crystal molecule refractive index is being parallel to the component of horizontal direction of liquid crystal panel.
As shown in Figure 3,4, the first oriented layer 14 with a side contacts of liquid crystal layer is also included in described color membrane substrates, also include the second oriented layer 15 contacted with the opposite side of liquid crystal layer in described array base palte, the direction of orientation of described first oriented layer 14 and the direction of orientation of the second oriented layer 15 orthogonal.Concrete, the first oriented layer 14 is arranged on first substrate 4, and its thickness is greater than the thickness of the multiple strip shaped electric poles in the second public electrode 5', thus makes the second public electrode 5' be embedded in described first oriented layer 14; Second oriented layer 15 is arranged on flatness layer 13, and its thickness is greater than the thickness of the multiple strip shaped electric poles in the first public electrode 5, thus its thickness is also just greater than the thickness of the first pixel electrode 7, second pixel electrode 7 ', therefore the first public electrode 5, first pixel electrode 7, second pixel electrode 7 ' is all embedded in the second oriented layer 15.
In the present embodiment, described first oriented layer 14 and the second oriented layer 15 adopt polyimide based material to make.The present embodiment liquid crystal panel makes in the process of color membrane substrates, the first oriented layer 14 is just made above it after the second public electrode 5' completes, same, in the manufacturing process of array base palte, after the first public electrode 5, first pixel electrode 7 and the second pixel electrode 7' complete, just make the second oriented layer 15 above it.
In the present embodiment, because positivity liquid crystal is optical anisotropy state, therefore the shape of the liquid crystal of positivity shown in Fig. 3 is shown as ellipse, and the long axis oriented layer direction arrangement of positivity liquid crystal molecule, namely oriented layer determines the initial orientation direction of positivity liquid crystal molecule.Compare embodiment 1, due to the stabilizing polymer of blue phase liquid crystal, liquid crystal panel not making alive time it is optical isotropy state, therefore do not need the oriented layer that other liquid crystal such as positivity liquid crystal or negative liquid crystal must adopt in embodiment 1, therefore manufacturing cost can be reduced, simplified manufacturing technique.
In the present embodiment, as shown in Figure 3, the initial orientation of the positivity liquid crystal molecule of transmission area and echo area is vertical direction, and namely its long axis direction is perpendicular to liquid crystal panel, and light can not produce phase-delay quantity by the liquid crystal layer be vertically oriented, and realizes dark-state; As shown in Figure 4, when liquid crystal panel applies voltage, transmission area is identical with the motion change of blue phase liquid crystal in embodiment 1 with the motion change of the positivity liquid crystal molecule of echo area, the i.e. long axis electric field line direction arrangement of positivity liquid crystal molecule, the phase-delay quantity of the liquid crystal of transmission area and echo area is equal, repeats no more here.
In the present embodiment, other structures of liquid crystal panel are identical with embodiment 1, repeat no more here.
Liquid crystal panel in the various embodiments described above may be used for constructing transflective liquid crystal display.
The present invention is by the change of the electrode structure to transmission area in liquid crystal panel and echo area, the coupling of the phase-delay quantity of liquid crystal in transmission area and echo area can be ensured, thus the box of liquid crystal cell in liquid crystal panel is thick when being consistent, greatly can simplify the manufacture craft of liquid crystal panel, also improve the display quality of transflective liquid crystal display simultaneously.
Be understandable that, the illustrative embodiments that above embodiment is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (12)
1. a liquid crystal panel, liquid crystal layer is included in described liquid crystal panel, this liquid crystal panel has multiple pixel region, described each pixel region comprises at least one pixel region, each described pixel region comprises transmission area and echo area, it is characterized in that, the first electric field is provided in described transmission area, described first electric field is the direction of an electric field transverse horizontal electric field parallel with the direction, plate face of described liquid crystal panel, described transverse horizontal electric field is provided by the first public electrode and the first pixel electrode being arranged on described liquid crystal layer the same side, described first public electrode and the first pixel electrode be arranged in parallel, the second electric field is provided in described echo area, described second electric field be direction of an electric field and described liquid crystal panel direction, plate face between there is the tilting electric field at pitch angle, described tilting electric field is provided by the second public electrode and the second pixel electrode being separately positioned on described liquid crystal layer both sides, and described second public electrode and the second pixel electrode be arranged in parallel but orthogonal projection on described liquid crystal panel offsets one from another, the effective refractive index of the liquid crystal of the described transmission area under the effect of described first electric field is greater than the effective refractive index of the liquid crystal of the described echo area under the effect of described second electric field.
2. liquid crystal panel according to claim 1, it is characterized in that, described liquid crystal panel comprises the color membrane substrates and array base palte that are oppositely arranged, the color filter that described color membrane substrates comprises first substrate and arranges on the first substrate, and described second public electrode is arranged on described color filter; Described array base palte comprises second substrate, on described second substrate, the part of corresponding echo area is provided with reflection horizon, described first public electrode and the first pixel electrode are arranged on the part of corresponding transmission area on second substrate, and described second pixel electrode is arranged on described reflection horizon.
3. liquid crystal panel according to claim 2, it is characterized in that, described first public electrode, the second public electrode, the first pixel electrode and the second pixel electrode respectively comprise multiple strip shaped electric poles, multiple strip shaped electric poles in described first public electrode and the multiple strip shaped electric poles interval successively in the first pixel electrode, multiple strip shaped electric poles in described second public electrode and the multiple strip shaped electric poles in the second pixel electrode orthogonal projection interval successively on liquid crystal panel, and the shape and size of these strip shaped electric poles are all identical.
4. liquid crystal panel according to claim 3, it is characterized in that, arbitrary strip shaped electric poles in described first public electrode is all identical with the interval width between the strip shaped electric poles in its first adjacent pixel electrode and be d1, interval width between adjacent two strip shaped electric poles in described second public electrode and the interval width between adjacent two strip shaped electric poles in described second pixel electrode all identical and be d2, and d1<d2.
5. liquid crystal panel according to claim 4, is characterized in that, the scope of d1 is the scope of 2-7 μm, d2 is 5-10 μm.
6. liquid crystal panel according to claim 5, is characterized in that, the field intensity of described first electric field is less than or equal to the field intensity of described second electric field.
7. according to the liquid crystal panel one of claim 2-6 Suo Shu, it is characterized in that, also flatness layer is included in described array base palte, described flatness layer is arranged on second substrate, the thickness that the thickness of flatness layer is greater than described reflection horizon can be embedded in described flatness layer to make described reflection horizon, and described first public electrode, the first pixel electrode and the second pixel electrode are all arranged on flatness layer.
8. according to the liquid crystal panel one of claim 2-6 Suo Shu, it is characterized in that, described color membrane substrates is provided with the first polaroid away from the side of liquid crystal layer, described array base palte is provided with the second polaroid away from the side of liquid crystal layer, the light transmission shaft of described first polaroid and the light transmission shaft of the second polaroid orthogonal, described first substrate is provided with second phase retardation plate and first phase retardation plate successively away from the side of liquid crystal layer, described second phase retardation plate and first phase retardation plate are arranged between first substrate and the first polaroid, described second substrate is provided with third phase retardation plate and the 4th phase delay chip successively away from the side of liquid crystal layer, described third phase retardation plate and the 4th phase delay chip are arranged between second substrate and the second polaroid, the optical axis direction of described second phase retardation plate and third phase retardation plate is orthogonal, the optical axis direction of first phase retardation plate and the 4th phase delay chip is orthogonal.
9. liquid crystal panel according to claim 8, is characterized in that, described second phase retardation plate and described third phase retardation plate adopt quarter-wave plate, and described first phase retardation plate and described 4th phase delay chip adopt 1/2nd wave plates.
10. according to the liquid crystal panel one of claim 2-6 Suo Shu, it is characterized in that, described liquid crystal adopts blue phase liquid crystal; Or, described liquid crystal adopts positivity liquid crystal, the first oriented layer with a side contacts of liquid crystal layer is also included in described color membrane substrates, also include the second oriented layer contacted with the opposite side of liquid crystal layer in described array base palte, the direction of orientation of described first oriented layer and the direction of orientation of the second oriented layer orthogonal.
11. according to the liquid crystal panel one of claim 1-6 Suo Shu, it is characterized in that, the thickness of part of the corresponding described echo area of described liquid crystal layer is equal with the thickness of the part of corresponding transmission area, and the effective refractive index of the liquid crystal in the described transmission area under the effect of described first electric field is 2 times of the effective refractive index of liquid crystal in the described echo area under the effect of described second electric field.
12. 1 kinds of transflective liquid crystal displays, the driving circuit comprising liquid crystal panel and be connected with described liquid crystal panel, is characterized in that, described liquid crystal panel adopts the arbitrary described liquid crystal panel of claim 1-11.
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| CN102981324B (en) | 2012-12-10 | 2017-07-14 | 京东方科技集团股份有限公司 | A kind of semi-transparent semi-reflecting blue-phase liquid crystal display panel and liquid crystal display device |
| CN103869541A (en) * | 2012-12-10 | 2014-06-18 | 京东方科技集团股份有限公司 | Half transparent and half reflecting liquid crystal display panel, manufacture method thereof, and liquid crystal display device |
| CN102981325A (en) * | 2012-12-11 | 2013-03-20 | 京东方科技集团股份有限公司 | Semi-transparent and semi-reflective liquid-crystal display panel and liquid-crystal display device |
| CN103529607B (en) | 2013-10-29 | 2017-05-31 | 京东方科技集团股份有限公司 | A kind of liquid crystal display panel, display device and its driving method |
| CN104020616B (en) | 2014-06-04 | 2016-08-24 | 京东方科技集团股份有限公司 | Transmitting/reflecting LCD and driving method thereof |
| CN104834133A (en) * | 2015-05-18 | 2015-08-12 | 武汉华星光电技术有限公司 | Liquid crystal display and liquid crystal display module thereof |
| CN105204209B (en) * | 2015-10-23 | 2019-03-15 | 武汉华星光电技术有限公司 | A kind of blue-phase liquid crystal display panel |
| CN106773191A (en) * | 2016-11-21 | 2017-05-31 | 上海天马微电子有限公司 | Display panel, driving circuit thereof and display device |
| CN114566114B (en) * | 2022-04-29 | 2022-08-09 | 惠科股份有限公司 | Display panel and display device |
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| JP2002001857A (en) * | 2000-06-21 | 2002-01-08 | Nitto Denko Corp | Resin board and liquid crystal display device |
| WO2007135853A1 (en) * | 2006-05-19 | 2007-11-29 | Sharp Kabushiki Kaisha | Liquid crystal display unit |
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| CN1672089A (en) * | 2002-04-30 | 2005-09-21 | 中佛罗里达大学 | Transflective liquid crystal display with partial switching |
| CN1540400A (en) * | 2003-04-24 | 2004-10-27 | ������������ʽ���� | LCD display device |
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