Patent Grant
12027128
The present disclosure relates to the field of display technologies, and in particular, relates to a display module and a display device.
With the development of display technologies, a series of color-film-less liquid crystal display modules have emerged. The color-film-less liquid crystal display module refers to a display module which does not involve any color film but is provided with a color backlight module. It can be seen that the color-film-less liquid crystal display module generally realizes the color display by means of the color backlight module.
Currently, the color-film-less liquid crystal display module includes a driving apparatus, and a color backlight module and a liquid crystal display panel that are stacked in sequence. The driving apparatus can be configured to first drive, by means of a progressive scanning, liquid crystal molecules included in the liquid crystal display panel to turn over, and then turn on a backlight source included in the color backlight module, so as to realize the display.
Embodiments of the present disclosure provide a display module and a display device. The technical solutions are described as below.
In some embodiments of the present disclosure, a display module is provided, and the display module includes:
In some embodiments, the plurality of light assigning assemblies are arranged in a one-to-one correspondence with the plurality of backlight sources, and
In some embodiments, a center point of each of the plurality of backlight sources is overlapped with an axis line of the corresponding light assigning assembly.
In some embodiments, a size of the first end is less than a size of the second end, and at least one of the following requirements is met:
In some embodiments, the light assigning assembly includes a reflective cup, wherein a cup body of the reflective cup is the body portion of the light assigning assembly, a lower opening of the reflective cup is the first end of the light assigning assembly, and an upper opening of the reflective cup is the second end of the light assigning assembly;
In some embodiments, the light assigning assembly includes a lens, wherein a lens body of the lens is the body portion of the light assigning assembly, a first end of the lens body is the first end of the light assigning assembly, a second end of the lens body is the second end of the light assigning assembly, and the lens body is a conical shell including a cavity;
In some embodiments, the cavity of the lens body is provided with a third quadric surface, wherein the third quadric surface is convex toward the second end of the lens body and is disposed on a side, distal from the first end of the lens body, of the first quadric surface, and an orthogonal projection of the third quadric surface on the liquid crystal display module is overlapped with an orthogonal projection of the first quadric surface on the liquid crystal display module, wherein
In some embodiments, the orthogonal projection of the third quadric surface on the liquid crystal display module covers the orthogonal projection of the first quadric surface on the liquid crystal display module.
In some embodiments, the lens includes a first curved lens, a first fixed cavity, a second curved lens, and a second fixed cavity, wherein
In some embodiments, at least one of the following requirements is met: both a focus of the first quadric surface and a focus of a third quadric surface are on a side of a second face of the backlight source, wherein the second face of the backlight source is the light exiting face of the backlight source; and
In some embodiments, at least one of the following requirements is met: a first distance between the focus of the second quadric surface and the backlight source ranges from 1 mm to 4 mm;
In some embodiments, the driving apparatus is further configured to: drive at least one light-emitting element of a different color than the ith color in each of the backlight sources to emit light in the ith driving process,
In some embodiments, the driving apparatus is further configured to:
In some embodiments, each of the backlight sources includes a light-emitting element of a first color, a light-emitting element of a second color and a light-emitting element of a third color.
In some embodiments, the three light-emitting elements in each of the backlight sources are arranged in a triangle pattern, and any two adjacent light-emitting elements in each of the backlight subareas are of different colors.
In some embodiments, each of the backlight sources further includes a light-emitting element of a fourth color; and
In some embodiments, the first color is red, the second color is green, the third color is blue, and the fourth color is white; and
In some embodiments, the light-emitting elements of N colors in each of the backlight sources is integrated in a same chip.
In some embodiments, the display module further includes:
In some embodiments, the driving apparatus includes a processing circuit, a control circuit, a backlight driving circuit and a power supply circuit, and the liquid crystal display module further includes a display panel driving circuit;
In some embodiments of the present disclosure, a display device is provided, and the display device includes: a power supply component and a display module; the power supply component is connected to the display module and configured to power the display module; and the display module includes:
For clearer descriptions of the technical solutions in the embodiments of the present disclosure, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and persons of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.
In order to make the purposes, technical solutions and advantages of the present disclosure clearer, the following further describes the embodiments of the present disclosure in detail with reference to the accompanying drawings.
Color-film-less display panels are widely used in various display modules because they can realize color display without needing to dispose a color film. A display module equipped with the color-film-less display panel may be referred to as a color-film-less display module. Currently, compared with a conventional display module (i.e., a display module with color films), the color-film-less display module not only has a high resolution, but also has a low heat generation and a low power consumption. However, the inventors have discovered that the current color-film-less display modules are low in luminance and have serious color crosstalk.
Embodiments of the present disclosure provide a display module, which not only can be implemented as a color-film-less display module but also can avoid or alleviate the color crosstalk, and can achieve a high display luminance and excellent display effect.
In an embodiment of the present disclosure, the liquid crystal display panel may have a plurality of display subareas arranged along a column direction. The color backlight module 10 may have a plurality of backlight subareas in a one-to-one correspondence to the plurality of display subareas. Furthermore, the color backlight module 10 may include a plurality of backlight sources 101 located in each backlight subarea, and each backlight source 101 may include light-emitting elements L1 of N colors, where N may be a positive integer greater than 1. Each light-emitting element L1 is configured to emit light of a single color.
For example, a liquid crystal display panel 201 shown in
It should be noted that the number of pixels included in the liquid crystal display panel 201 may be different from the number of the backlight sources 101 included in the color backlight module 10. Generally, the number of the backlight sources 101 included in the color backlight module 10 is far less than the number of the pixels included in the liquid crystal display panel 201. That is, one backlight source 101 may provide color backlight for a plurality of pixels. In this way, it can be seen that the display module described in the embodiments of the present disclosure can realize color display without the need of disposing the color film.
Continuously referring to
It can be known from the descriptions of the foregoing embodiments that the action of driving the liquid crystal molecules to turn over is performed under the premise of charging the pixel electrode of the pixel to which the liquid crystal molecules belong. That is, the driving apparatus 30 may be configured to sequentially charge (optionally, through a progressive scanning) the pixels in each display subarea, to drive the liquid crystal molecules in each display subarea to turn over.
Exemplarily, referring to the color backlight module 10 shown in
Here, the first driving process T1 may include: (1) charging the pixel electrode of each pixel in the first display subarea Z1 to drive the liquid crystal molecules in the first display subarea Z1 to turn over to cause the first display subarea Z1 to switch to the light transmitting state, and after the liquid crystal molecules in the first display subarea Z1 are turned over, driving a light-emitting element L1 of a first color included in each backlight source 101 in the first backlight subarea M1 corresponding to the first display subarea Z1 to emit light; (2) charging the pixel electrode of each pixel in the second display subarea Z2 to drive the liquid crystal molecules in the second display subarea Z2 to turn over to cause the second display subarea Z2 to switch to the light transmitting state, and after the liquid crystal molecules in the second display subarea Z2 are turned over, driving a light-emitting element L1 of a first color included in each backlight source 101 in the second backlight subarea M2 corresponding to the second display subarea Z2 to emit light; and (3) charging the pixel electrode of each pixel in the third display subarea Z3 to drive the liquid crystal molecules in the third display subarea Z3 to turn over to cause the third display subarea Z3 to switch to the light transmitting state, and after the liquid crystal molecules in the third display subarea Z3 are turned over, driving a light-emitting element L1 of a first color included in each backlight source 101 in the third backlight subarea M3 corresponding to the third display subarea Z3 to emit light.
Therefore, in the first driving process T1, the light-emitting elements L1 of the first color (e.g., the red (R) color) in all the backlight sources 101 included in the color backlight module 10 are turned on. Still referring to the time sequence diagram shown in
Upon completion of the above three driving processes, the display module may successfully display the one frame of image. In this way, one driving process may also be referred to as a monochrome-frame scanning time (or, a monochrome-frame charge), and the N driving processes may be collectively referred to as one image (one frame of image) scanning time (or, an image charge). That is, one frame of image would be equal to a superposition or combination of several monochrome-frames. In addition, in the time sequence diagram shown in
Besides, combining the time sequence diagram shown in
Lu=Lr0*TBT+Lg0*TBT+Lb0*TBT,
where Lr0 indicates the luminance of the red light-emitting element L1, Lg0 indicates the luminance of the green light-emitting element L1, and Lb0 indicates the luminance of the blue light-emitting element L1.
In view of the descriptions of the foregoing embodiments, it can be determined that through the partitioning of the driving processes, charging of the pixel electrodes included in the pixels can be accelerated (i.e., TCT is reduced), and then a time period for turning over the liquid crystal molecules can be prolonged (i.e., TBT is increased), so as to ensure that the liquid crystal molecules can be turned over reliably and successfully prior to turning on the backlight sources. In this way, the color crosstalk challenge due to the liquid crystal molecules being incapable of turning over timely in the related art can be effectively solved or alleviated. In addition, by individually controlling the respective light-emitting elements L1 of different colors to emit light, an excellent display effect can be further guaranteed.
In some embodiments, as shown in
In some embodiments, the display module shown in
In addition, the plurality of backlight sources 101 are disposed on the first ends 401 of the plurality of light assigning assemblies 40, an orthogonal projection of each of the plurality of backlight sources 101 on the liquid crystal display module 20 is overlapped with an orthogonal projection of a corresponding light assigning assembly 40 on the liquid crystal display module 20, and a light exiting face of each of the plurality of backlight sources 101 faces towards the second end 402 of the corresponding light assigning assembly 40, such that the light is emitted through the second end 402.
By disposing the light assigning assembly 40, the light emitted from the backlight source 101 can be adjusted. For example, in the case that the light assigning assembly 40 is a reflective cup, the light emitted from the backlight source 101 can be collimated and adjusted, such that the display luminance and display uniformity of the liquid crystal display module 20 are improved, and the display effect is great.
In summary, the embodiments of the present disclosure provide a display module which includes a color backlight module, a liquid crystal display panel and a driving apparatus. The liquid crystal display panel has a plurality of display subareas arranged along a column direction, and the color backlight module has a plurality of backlight subareas in a one-to-one correspondence to the plurality of display subareas and includes a plurality of backlight sources. As the driving apparatus is configured to sequentially drive liquid crystal molecules in the display subareas to turn over, and each time the liquid crystal molecules in each display subarea have been turned over, the driving apparatus is further configured to drive the light-emitting element of one color included in each backlight source in one corresponding backlight subarea to emit light, thereby effectively alleviating the phenomenon that the liquid crystal molecules cannot be turned over when the backlight sources are turned on. Therefore, the picture finally displayed by the display module would not have the color crosstalk defect, and the display module has an excellent display effect.
In some embodiments, it can be seen referring to
In some embodiments, by taking the structure shown in
In some embodiments, it can be seen referring to
In some embodiments, as shown in
The inner wall face 4031 of the body portion 403 is a face, proximal to a side of an inner space of the light assigning assembly 40, of the body portion 403, and the light emitted from the backlight source 101 is exited through the inner space. Accordingly, the inner space is a space enclosed by the first end 401, the second end 402, and the inner wall face.
In some embodiments, the light assigning assembly 40 in the embodiments of the present disclosure includes a reflective cup B shown in
By disposing the reflective cup B as the light assigning assembly 40, a function of collimation and emitting of the light is achieved. The light emitted from the backlight source 101 is reflected by the inner wall face 4031 of the cup body, light emitted at a previous squint angle is deflected towards a front angle upon multiple reflection, and a divergence angle of the light emitted from the upper opening B3 is less than a divergence angle of the light emitted from the backlight source 101 disposed on the lower opening B2, such that the front angle is improved.
In some embodiments, it can be seen in conjunction with
In some embodiments,
In some embodiments, in a direction of a center axis line Z01 of the reflective cup B, the distance h1 between the lower opening B2 and the upper opening B3 is 15 mm, 18 mm, 20 mm, 22 mm, 25 mm, and the like.
In some embodiments, by taking the light assigning assembly 40 being the reflective cup as an example, it can be seen referring to
In addition, on the basis of
In some embodiments, the chamfer is a round chamfer shown in
In
In some embodiments, a radius of the round chamfer is 0.5 mm, and/or a thickness (that is, a wall thickness) of the wall sub-face is 0.5 mm. The luminance uniformity is further improved based on the parameters upon tests.
In some embodiments, in conjunction with
In some embodiments, a minimum distance between the first upper opening B31 and the second upper opening B32 is greater than or equal to 0.2 mm, and is less than or equal to 2 mm. That is, a distance between two adjacent reflective cups B is less. As such, the luminance uniformity is greatly improved. In some embodiments, the minimum distance between two adjacent upper openings is 0.5 mm, 0.8 mm, 1 mm, and the like, which is not limited in the embodiments of the present disclosure.
In some embodiments, an inner wall face 4031 of the cup body includes at least one of a plane, a polygonal face, and a curved face.
In some embodiments, in the case that the light assigning assembly 40 is the reflective cup B, it can be seen referring to the light assigning assembly 40 shown in
In some embodiments, in conjunction with
In some embodiments, as shown in
In a direction perpendicular to the Z direction, the curvature of the curved face is not changed. That is, the curvatures at different positions in a same height are the same, as shown in
In some embodiments, as shown in
In some embodiments, it can be seen referring to
By disposing the plurality of first micro structures W1 on the inner wall face 4031 of the cup body, the directions of normal lines (such as f1 and f2 shown in
For the effect of disposing the micro structure, the backlight module with the micro structure and the backlight module without the micro structure are simulated, and a result of the simulation is shown in
In practical implementations, the first micro structure W1 is a convex structure (as shown in
In some embodiments, as shown in
In the case that the four side faces of the inner wall face 4031 of the cup body is a plane, the shared edge al of the plurality of first micro structures W1 arranged in a R2 direction shown in
In the case that the four side faces of the inner wall face 4031 of the cup body is a curved face, the shared edge al of each of the plurality of first micro structures is perpendicular to a boundary direction (such as a R1 direction shown in
In practical implementations, a shape of the inner wall face 4031 of the cup body is set according to actual requirements using an optical simulation software, such as Light-Tools. The inventors set the reflective cup B using the Light-Tools, and a smoothing curve is generated based a second order Bezier curve. The second order Bezier curve is:
B(t)=(1−t)2P0+2t(1−t)P1+t2P2,t∈[0,1].
P0, P1, and P2 represent three fixed points, t represents a control connection points among the three fixed points. Based on the above Bezier curve, the inner wall face 4031 of the cup body is generated by less control points. The inner wall face 4031 of the cup body includes four curved faces with a changed curvature, that is, a Bezier face.
In some embodiments, as shown in
In some embodiments, a position, with a maximum curvature, of the inner wall face 4031 of the cup body is a first position, and a distance between the first position and the lower opening B2 is less than a distance between the first position and the upper opening B3 in the direction of the normal line of the liquid crystal display module 20. That is, in the direction of the normal line of the display module, the position, with the maximum curvature, of the inner wall face 4031 of the cup body is proximal to the lower opening B2.
In some embodiments, as shown in
In the case that both the lower opening B2 and the upper opening B3 are in the rectangular shape, the inner wall face 4031 of the cup body includes two opposite first wall sub-faces and two opposite second wall sub-faces. The two first wall sub-faces have the same shape and mirror symmetry, and the two second wall sub-faces have the same shape and mirror symmetry.
In some embodiments, as shown in diagrams a and b shown in
In some embodiments, as shown in
In some embodiments, as shown in diagrams a and b shown in
In practical implementations, the included angle θ1 between the first reflective face s1 and the second reflective face s2 is determined based on the difficulty in manufacturing and the actual effect. For example, the included angle θ1 between the first reflective face s1 and the second reflective face s2 is 100°, 110°, 120°, 130°, 140°, 150°, 160°, 360°, and the like, which is not limited in the present disclosure.
In some embodiments, as shown in the diagram c shown in
It should be noted that the first micro structure W1 is not limited to the above structures, and may include a poly pyramid structure, such as pentagram pyramid shown in the diagram d shown in
The plurality of first micro structures W1 are closely arranged and/or arranged in an array on the inner wall face 4031 of the cup body of the reflective cup. The plurality of first micro structures W1 being closely arranged on the inner wall face 4031 of the cup body of the reflective cup indicates that the plurality of first micro structures W1 completely cover the inner wall face 4031 of the cup body. In
In practical implementations, the reflective face is further provided with a high-reflective film, such that the reflective efficiency of the reflective face is further improved, and a loss of the light is reduced. For example, a reflective rate of the high-reflective film for the emitted light is greater than or equal to 90%.
In some embodiments, the light assigning assembly 40 includes a lens G shown in
In addition, the cavity of the lens body G1 is provided with a first quadric surface G1a, an inner wall of the lens body G1 is provided with a second quadric surface G1b. The first quadric surface G1a is convex toward the first end G2 of the lens body G1, and the second quadric surface G1b is convex toward the second end G3 of the lens body. The light from the backlight source within a first incidence angle range is collimated and emitted from the second end G3 of the lens body G1 upon being refracted by the first quadric surface G1a, and incidence light from the backlight source 101 within a second incidence angle range is collimated and emitted from the second end G3 of the lens body G1 upon being refracted by the second quadric surface G1b. A maximum angle within the first incidence angle range is less than a minimum angle within the second incidence angle range, and the first incidence angle range is an incidence angle range of light from the backlight source 101 directly emitted from the second end G3 of the lens body G1 without being reflected by the inner wall of the lens body G1.
The lens body G1 is a cup-shaped shell, and is generally a conical shell. The lens body G1 is one of a glass reflective cup, and is made by a single demolding process. In the case that the lens body G1 is the conical shell, a diameter of the first end G2 of the lens body G1 is less than the second end G3 of the lens body. As such, the backlight source 101 is disposed on the first end G2 of the lens body G1, such that the light from the backlight source 101 is emitted through the second end G3 of the lens body.
In the embodiments of the present disclosure, for improvement of the collimation of the emitted light, the first quadric surface G1a is provided in the cavity of the lens body G1, and the second quadric surface G1b is provided in the inner wall of the lens body G1. Both the first quadric surface G1a and the second quadric surface G1b are any one of quadric surface, such as a spherical face, an ellipsoidal spherical face, and an ellipsoidal paraboloid face, and the quadric surface is a curved surface represented by a ternary quadratic equation. That is, a curved surface represented by a ternary quadratic equation in a three-dimensional coordinate system is referred to as a corresponding figure of the quadric surface.
As shown in
It should be noted that the first incidence angle range is an incidence angle range of the light from the backlight source 101 directly emitted without being reflected by the inner wall of the lens body G1. The first incidence angle range is determined based on a shape and a size of the cavity of the lens body G1, which is not limited in the embodiments of the present disclosure. It should be noted that the light of the collimation and emitting is the light that an included angle between the emitted light and the axis line of the lens body G1 is converged within ±15° upon being refracted by the first quadric surface G1a. The light from the backlight source 101 within the first incidence angle range is the light marked by A in
The second quadric surface G1b is convex toward the second end of the lens, and the second end G3 of the lens body G1 is an end, emitting the light, of the lens body G1. That is, the first quadric surface G1a is convex toward a light emitting face of the backlight source 101. As such, the light from the backlight source 101 within the second incidence angle range is refracted on the second quadric surface G1b upon passing through the second quadric surface G1b, and is collimated and emitted from the second end G3 of the lens body G1.
It should be noted that the light within the second incidence angle range is an incidence angle range of the light without the first incidence angle range.
It should be noted that the light of the collimation and emitting is the light that an included angle between the emitted light and the axis line of the lens body G1 is converged within ±15° upon being refracted by the second quadric surface G1b. The light from the backlight source 101 within the first incidence angle range is the light marked by A in
In addition, the backlight source 101 on the first end G2 of the lens body G1 is one of light emitting diodes, and the backlight source 101 is disposed on the axis line of the lens body G1, such that the light from the backlight source 101 is assigned on two sides of the axis line of the lens body G1.
It can be seen from the above embodiments that in the embodiments of the present disclosure, as the first quadric surface G1a is provided in the cavity of the lens body G1, the second quadric surface G1b is provided in the inner wall of the lens body G1, the first quadric surface G1a is convex toward the first end G2 of the lens body G1, and the second quadric surface G1b is convex toward the second end G3 of the lens body, the light from the backlight source 101 within the first incidence angle range is refracted upon passing through the first quadric surface G1a, and is collimated and emitted from the second end G3 of the lens body G1, and the light from the backlight source 101 within the second incidence angle range is refracted on the second quadric surface G1b upon passing through the second quadric surface G1b, and is collimated and emitted from the second end G3 of the lens body G1. In addition, as the maximum angle within the first incidence angle range is less than the minimum angle within the second incidence angle range, and the first incidence angle range is the incidence angle range of light from the backlight source 101 directly emitted from the second end G3 of the lens body G1 without being reflected by the inner wall of the lens body G1, all light emitted from the backlight source 101 is collimated and emitted upon being adjusted. Therefore, an energy loss of the backlight source 101 is avoided.
In some embodiments, it can be seen referring to
It should be noted that each second micro structure W2 is equivalent to a block structure, and a top portion of the block structure is an arc face. That is, a face, distal from the backlight source 101, of the block structure is any arc face, such as a spherical face, a half arc face, and the like, which is not limited in the embodiments of the present disclosure. The arc face is convex toward a direction away from the backlight source 101. Each two adjacent second micro structures W2 are closely arranged. In the case that a number of the second micro structures W2 on the end face of the second end G3 of the lens body G1 is up to a specific number, the uniformity of the end face of the second end of the lens body G1 tends to be uniform.
A light source utilization rate of each of the plurality of second micro structures is greater than 90%. It should be noted that the simulation calculation is performed based on the curvature of the face of each second micro structure W2 distal from backlight 101, and a result of a minimum normalized variance is acquired. In the case that the curvature is 0.4358, the light source utilization rate of each second micro structure W2 is greater than 90%. As such, a probability of light passing through the second micro structure W2 array is improved, and the display luminance of the lens is improved.
A distance between each two adjacent second micro structures W2 is less than or equal to 1 mm. It should be noted that in the case that the distance between each two adjacent second micro structures W2 tends to be 1 mm, the uniformity of the end face of the second end G3 of the lens body G1 is greater than 60%.
In some embodiments, it can be seen referring to
In some embodiments, by taking
In some embodiments, it can be seen in conjunction with
A first end of the first fixed cavity C1 is affixed on the first end of the lens body G1, the first curved lens G01 is affixed on a second end of the first fixed cavity C1, and a convex surface of the first curved lens G01 forms the first quadric surface G1a. A first end of the second fixed cavity C2 is affixed on the second end G3 of the lens body G1, the second curved lens G02 is affixed on a second end of the second fixed cavity C2, and a convex surface of the second curved lens G02 forms the third quadric surface G1c.
It should be noted that in conjunction with
In some embodiments, both a focus of the first quadric surface G1a and a focus of a third quadric surface G1c are on a side of a second face of the backlight source 101, and the second face of the backlight source 101 is the light exiting face of the backlight source; and/or, the second quadric surface surrounds the backlight source 101, a focus of the second quadric surface is on a side of a first face of the backlight source 101, and the first face of the backlight source 101 is a face opposite to the light exiting face of the backlight source 101.
It should be noted that the second quadric surface G1b is one of the ellipsoidal paraboloid faces, and surrounds the backlight source 101. As such, in the case that the focus of the second quadric surface G1b is disposed on a side of the first face of the backlight source 101, the incident light from the backlight source 101 within the second incidence angle range is emitted through the second quadric surface G1b. That is, in the case that the focus of the second quadric surface G1b is on a bottom of the backlight source 101, the incident light from the backlight source 101 within the second incidence angle range is irradiated to the quadric surface, such that the energy loss of the backlight source 101 is avoided.
It should be noted that as the focus of the first quadric surface G1a is on the side of the second face of the backlight source 101, a distance is present between the backlight source 101 and the first quadric surface G1a. As such, the light from the backlight source 101 is irradiated to the first quadric surface G1a within the first incidence angle range Upon passing through the cavity between the backlight source 101 and the first quadric surface G1a, and is then refracted through the second quadric surface G1b. As a refraction angle of light is less than an incidence angle in irradiating from air into other media, the propagation direction of light is changed. In the case that the distance between the focus of the first quadric surface G1a and the second face of backlight source 101 is determined, the light emitted from the second quadric surface G1b is directly collimated and emitted.
In some embodiments, the focus of the first quadric surface G1a and the focus of the third quadric surface G1c are coincided on the side of the second face of the backlight source.
In some embodiments, a first distance between the focus of the second quadric surface and the backlight source ranges from 1 mm to 4 mm.
It should be noted that in the case that the distance between the focus of the second quadric surface G1b and the backlight source 101 ranges from 1 mm to 4 mm, incident light from the backlight source 101 within the second incidence angle range is emitted from the second quadric surface G1b.
In some embodiments, the distance between the focus of the second quadric surface G1b and the backlight source 101 is 2 mm, a curved surface coefficient of the second quadric surface G1b is −1.22, and a curvature is 0.35. Thus, an angle at which the light emitted from the backlight source 101 reaches the second quadric surface G1b is equal to the included angle between the light emitted upon collimation and the normal line, such that the collimation of the light reflected by the second quadric surface G1b is further improved.
And/or, a second distance between the focus of the first quadric surface G1a and the second face of the backlight source 101 is greater than one-third of a distance between the first end G2 of the lend body G1 and the second end G3 of the lens body G1.
It should be noted that the distance between the focus of the first quadric surface G1a and the second face of the backlight source 101 is greater than one-third of the distance between the first end G2 of the lend body G1 and the second end G3 of the lens body G1, such that the angle of the reflection on the first quadric surface G1a is kept at a specific value. That is, the angle of the light reaching the first quadric surface G1a is adjusted based on the distance between the focus of the first quadric surface G1a and the second face of the backlight source 101, such that the light emitted from the second quadric surface G1b is collimated and emitted.
It should be further noted that the distance between the focus of the first quadric surface G1a and the second face of the backlight source 101 is determined based on the distance between the first end G2 of the lend body G1 and the second end G3 of the lens body G1. For example, in the case that the distance between the first end G2 of the lend body G1 and the second end G3 of the lens body G1 is 7 mm, the distance between the focus of the first quadric surface G1a and the second face of the backlight source 101 is 3 mm, which is not limited in the embodiments of the present disclosure.
And/or, a third distance between a focus of the third quadric surface G1c and the second face of the backlight source 101 is greater than half of the distance between the first end of the lend body G1 and the second end of the lens body G1, and a distance between the third quadric surface G1c and the second end G3 of the lens body G1 is less than a distance between the first quadric surface G1a and the first end G2 of the lens body G1.
In some embodiments, each the first quadric surface, the second quadric surface, the third quadric surface includes any one of a spherical face, an ellipsoidal spherical face, and an ellipsoidal paraboloid face.
It can be seen from the above embodiments that in the embodiments of the present disclosure, as the first quadric surface G1a is provided in the cavity of the lens body G1, the second quadric surface G1b and the third quadric surface G1c are provided in the inner wall of the lens body G1, the first quadric surface G1a is convex toward the first end G2 of the lens body G1, the second quadric surface G1b is convex toward the second end G3 of the lens body G1, and the third quadric surface G1c is convex toward the second end G3 of the lens body G1, the light from the backlight source 101 within the first incidence angle range is refracted upon passing through the first quadric surface G1a, and is collimated and emitted from the second end G3 of the lens body G1 upon passing through the third quadric surface G1c, and the light from the backlight source 101 within the second incidence angle range is refracted on the second quadric surface G1b upon passing through the second quadric surface G1b, and is collimated and emitted from the second end G3 of the lens body G1. In addition, as the maximum angle within the first incidence angle range is less than the minimum angle within the second incidence angle range, and the first incidence angle range is the incidence angle range of light from the backlight source 101 directly emitted from the second end of the lens body without being reflected by the inner wall of the lens body, all light emitted from the backlight source 101 is collimated and emitted upon being adjusted. Therefore, an energy loss of the backlight source 101 is avoided.
In some embodiments, as shown in
It should be noted that the predetermined array is an array meeting the display size of the lens array. For example, in the case that the display size of the lens array is a display size of 45 mm*75 mm, the lenses G1 are arranged in a 5*3 array. That is, the lens array is arranged in five rows and three columns. As shown in
It can be seen from above embodiments that in the embodiments of the present disclosure, as the plurality of lens G1 is arranged in the predetermined array, the display luminance of the lens array is improved, and the effect of the lens array is improved in the case that all light emitted from a light emitting element of each lens G1 is collimated and emitted upon being adjusted, and 100% of the light is used.
Here, the processing circuit 301 may be connected to the display panel driving circuit 202 and the control circuit 302 respectively and configured to receive image data, i.e., image signal(s), and may transmit one or more initial driving signal(s) to the display panel driving circuit 202 and the control circuit 302 based on the image data.
For example, referring to
The display panel driving circuit 202 may further be connected to the liquid crystal display panel 201. The display panel driving circuit 202 may be configured to drive the liquid crystal molecules included in the liquid crystal display panel 201 to turn over under the control of the initial driving signal.
For example, the display panel driving circuit 202 may charge the pixel electrode of each pixel included in the liquid crystal display panel 201 under the control of the initial driving signal. Therefore, the liquid crystal molecules may be turned over under the driving of the voltage difference between the pixel electrode and the common electrode.
The control circuit 302 may further be connected to the backlight driving circuit 303 and configured to transmit a backlight driving signal to the backlight driving circuit 303 under the control of the initial driving signal.
The backlight driving circuit 303 may further be connected to the color backlight module 10 and configured to drive the backlight sources 101 included in the color backlight module 10 to emit light under the control of the backlight driving signal.
For example, referring to
Optionally, the specified time sequence may be preset in the control circuit 302. For example, the specified time sequence may be the time sequence shown in
The power supply circuit 304 may be connected to the color backlight module 10 and configured to power the color backlight module 10.
Optionally, the processing circuit 301 may also be referred to as a processing system. The control circuit 302 may be a micro control unit (MCU). The light-emitting elements L1 described in the embodiments of the present disclosure may be light emitting diodes (LEDs), and correspondingly, the backlight driving circuit 303 may also be referred to as an LED driver integrated circuit (LED driver IC). The power supply circuit 304 may include a direct current (DC)-DC converter. The display panel driving circuit 202 may be a driver IC.
Optionally, the driving apparatus 30 including the above circuits may be disposed independently of the liquid crystal display module 20. The display panel driving circuit 202 and the liquid crystal display panel 201 may be integrated together. In this way, the driving apparatus 30 may also be referred to as a driving system.
Optionally, with reference to
Optionally, it can be seen based on
Optionally, with reference to the backlight sources shown in
Optionally, still referring to
Optionally, the first color may be red, the second color may be green, the third color may be blue, and the fourth color may be white (W). The addition of the white light-emitting element L1 can improve the overall light efficiency of the backlight sources 101.
In some embodiments, for the structure shown in
Illustratively, by taking the light assigning assembly 40 being the reflective cup as an example,
In some embodiments of the present disclosure, the light-emitting elements L1 of multiple colors in each backlight source 101 are integrated on a same chip, which is referred to as a LED chip. As such, the display effect is great. In some embodiments, the light-emitting elements L1 of multiple colors are separated.
In an example,
Optionally, according to the above descriptions of the display module, it can be known that in the embodiments of the present disclosure, the color backlight module 10 may be a direct-type backlight module, which can further improve the display effect.
In some other embodiments, the color backlight module 10 may otherwise be a side-type backlight module.
Optionally, with reference to
Optionally, in some embodiments of the present disclosure, the driving apparatus 30 may further be configured to drive, in the ith driving process, at least one light-emitting element L1 of a different color than the ith color in each backlight source 101 to emit light. Or, the driving apparatus 30 may further be configured to drive, in the ith driving process, each light-emitting element L1 of a different color than the ith color in each backlight source 101 to emit light. That is, when light-emitting elements L1 of at least one color are driven to emit light, light-emitting elements L1 of one or more different colors than the at least one color are also driven to emit light at the same time.
Here, the luminance of the light-emitting elements L1 of the ith color may be higher than the luminance of each of the light-emitting elements L1 of other colors which are turned on at the same time. In this way, the display luminance can be improved while the color crosstalk is avoided, which further improves the display effect of the display module.
An example is provided by taking the display module shown in
As shown in
It should be noted that the luminance of the light-emitting element L1 may be positively correlated to the magnitude of a potential transmitted by the driving apparatus 30. That is, the higher the potential is, the higher the luminance is; and the lower the potential is, the lower the luminance is. Thus, it can be seen from
Therefore, it can be determined from the time sequence diagram shown in
Lu=(Lr1*TBT+Lg1*TBT+Lb1*TBT)+(Lr2*2*TBT+Lg2*2*TBT+Lb2*2*TBT)=Lr1*TBT+Lr2*2*TBT+Lg1*TBT+Lg2*2*TBT+Lb1*TBT+Lb2*2*TBT,
in which Lr1 indicates the luminance of the red light-emitting element L1; Lr2 indicates the luminance of the red light-emitting element L1 in the case that the green light-emitting element L1 and the blue light-emitting element L1 are also driven to emit light when the red light-emitting element L1 is driven to emit light; Lg1 indicates the luminance of the green light-emitting element L1; Lg2 indicates the luminance of the green light-emitting element L1 in the case that the red light-emitting element L1 and the blue light-emitting element L1 are also driven to emit light when the green light-emitting element L1 is driven to emit light; Lb1 indicates the luminance of the blue light-emitting element L1; Lb2 indicates the luminance of the blue light-emitting element L1 in the case that the red light-emitting element L1 and the green light-emitting element L1 are also driven to emit light when the blue light-emitting element L1 is driven to emit light; Lr1*TBT+Lg1*TBT+Lb1*TBT indicates the display luminance of one frame of image corresponding to the time sequence diagram shown in
In addition, it can be seen from the above equation that if Lr1:Lg1:Lb1=Lr2:Lg2:Lb2, the color coordinates of the white-points can be kept unchanged.
Another example is provided by taking the display module shown in
As shown in
As described in the above embodiments, the luminance of the light-emitting element L1 may be positively correlated to the magnitude of a potential transmitted by the driving apparatus 30. In this way, it can be seen from
Therefore, it can be determined from the time sequence diagram shown in
Lu=(Lr+Lg+Lb)*TBT+(Lwr+Lwg+Lwb)*TBT,
where Lr indicates the luminance of the red light-emitting element L1; Lwr indicates the luminance of the red light-emitting element L1 in the case that the white light-emitting element L1 is also driven to emit light when the red light-emitting element L1 is driven to emit light; Lg indicates the luminance of the green light-emitting element L1; Lwg indicates the luminance of the green light-emitting element L1 in the case that the white light-emitting element L1 is also driven to emit light when the green light-emitting element L1 is driven to emit light; Lb indicates the luminance of the blue light-emitting element L1; Lwb indicates the luminance of the blue light-emitting element L1 in the case that the white light-emitting element L1 is also driven to emit light when the blue light-emitting element L1 is driven to emit light. Therefore, it can be determined that the overall display light efficiency (i.e., luminous efficiency) can be improved by performing the driving and displaying according to the time sequence diagram shown in
In addition, after the white color is added, the overall color coordinates of the white-point formed by each backlight source 101 may be: W+R+G+B, where R+G+B indicates the white-point color coordinates formed by a combination of R+G+B and may also be referred to as original white-point color coordinates. Therefore, if the coordinates of W are the same as the color coordinates formed by the combination of R+G+B, the overall coordinates of the white-point will not change; otherwise, it is necessary to change the color coordinates of the white-point according to the luminance and the coordinates of the white light-emitting element L1. Therefore, it can also be determined that as long as the W coordinates are the same as the color coordinates formed by the combination of R+G+B, the overall color coordinates of the white-point will not change regardless of whether Lwr, Lwg and Lwb are equal or not.
Optionally,
Optionally, the display module described in the embodiments of the present disclosure may be a color-film-less head-up display (HUD) device. An HUD is a display module disposed in a vehicle, and thus may also be referred to as a vehicle-mounted HUD. The vehicle-mounted HUD is generally an augmented reality (AR)-HUD, and the AR-HUD may include picture generation units (PGU). In other words, the display module provided by the embodiments of the disclosure may be applied to the vehicle-mounted field, bringing an innovation to the vehicle-mounted field.
It should be noted that the current AR-HUD generally adopts a common conventional liquid crystal display (LCD) panel. A conventional LCD only has a transmittance of 8.5%, and the low luminance and high power consumption have become the bottleneck of its development. By adopting the color-film-less display panel provided by the embodiments of the present disclosure, not only can the transmittance of the display panel be effectively improved to about 20%, but also the display luminance can be higher and the power consumption can be lower. Optionally, the color-film-less display module described in the embodiments of the present disclosure may adopt a FOG screen, i.e., the color-film-less display module may be a FOG color-film-less display module. Compared with a FOG display module having a color film, the overall light transmittance of the color-film-less display module can be improved to about 3 times.
In some embodiments, the display module described in the embodiments of the present disclosure may also be applied to the field of other display technologies, e.g., the field of medical display technologies.
In addition, the refresh frequency of the display module described in the embodiments of the present disclosure may be 180 hertz (Hz). When the refresh frequency is high enough, human eyes will not recognize switching of different colors. Thus, changes in colors of the image can be realized by superimposing images having different gray-scales. In some embodiments, the refresh frequency may be 60 Hz.
In summary, the embodiments of the present disclosure provide a display module which includes a color backlight module, a liquid crystal display panel and a driving apparatus. The liquid crystal display panel has a plurality of display subareas arranged along a column direction, and the color backlight module has a plurality of backlight subareas in a one-to-one correspondence to the plurality of display subareas and includes a plurality of backlight sources. As the driving apparatus is configured to sequentially drive liquid crystal molecules in the display subareas to turn over, and each time the liquid crystal molecules in each display subarea have been turned over, the driving apparatus is further configured to drive the light-emitting element of one color included in each backlight source in one corresponding backlight subarea to emit light, thereby effectively alleviating the phenomenon that the liquid crystal molecules cannot be turned over when the backlight sources are turned on. Therefore, the picture finally displayed by the display module would not have the color crosstalk defect, and the display module has an excellent display effect.
In step 3601, data of one frame of image is received.
In step 3602, N driving processes are sequentially executed in response to the data of the frame of image, and an ith driving process includes: sequentially driving liquid crystal molecules in display subareas to turn over, and after driving the liquid crystal molecules in each of the display subareas to turn over, driving a light-emitting element of an ith color included in each backlight source in one corresponding backlight subarea to emit light.
Optionally, N may be a positive integer greater than 1, and i may be a positive integer not greater than N.
In summary, the embodiments of the present disclosure provide a method of driving a display module. In the method, liquid crystal molecules in the display subareas are sequentially driven to turn over, and each time the liquid crystal molecules in each of the display subareas have been turned over, the light-emitting element of one color included in each backlight source in one corresponding backlight subarea is further driven to emit light, thereby effectively alleviating the phenomenon that the liquid crystal molecules cannot be turned over when the backlight sources are turned on. Therefore, the picture finally displayed by the display module would not have the color crosstalk defect, and the display module has an excellent display effect.
Optionally, a reference may be made to the above descriptions about the display module for other alternative implementations of step 3602, which are not repeated here.
Here, the power supply component J1 may be connected to the display module 00, and configured to power the display module 00.
It should be understood that the terms “first” and “second” in the specification and claims of the embodiments of the present disclosure, as well as the above-mentioned accompanying drawings, are used to distinguish similar objects, but not used to describe a specific sequence or precedence. It should be understood that data used in this case can be interchanged under appropriate circumstances, for example, it can be implemented in a sequence other than those given in the illustrations or descriptions of the embodiments of the present disclosure.
The above descriptions are merely optional embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, and the like made within the spirits and principles of the present disclosure shall all fall within the protection scope of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202110120983.2 | Jan 2021 | CN | national |
| 202321349870.0 | May 2023 | CN | national |
This application is a continuation in part application of U.S. application Ser. No. 17/569,199, filed on Jan. 5, 2022, and claims the priorities to the Chinese patent application No. 202110120983.2, filed on Jan. 28, 2021 and entitled “DISPLAY DEVICE AND METHOD OF DRIVING SAME”, and the Chinese patent application No. 202321349870.0, filed on May 30, 2023, the disclosures of which are herein incorporated by references in their entireties.
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| Number | Date | Country | |
|---|---|---|---|
| 20230306920 A1 | Sep 2023 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17569199 | Jan 2022 | US |
| Child | 18205710 | US |
