CN117854383A - Reflection screen - Google Patents

Abstract

The application belongs to the technical field of display, and particularly relates to a reflecting screen, which comprises a display assembly, wherein the display assembly comprises a display panel, the display panel comprises a plurality of micro display units, the display surface of each micro display unit is a plane and is used for receiving light source rays and reflecting display rays with image information, the display panel extends in a first direction, the projection of the light emitting surface of the display panel on the plane vertical to the first direction is a conical curve, and the extension line of the normal line of any micro display unit is intersected with the ground; the focal point of the conical curve falls in the light source assembly, and the light emergent angle of the light source assembly covers the whole display panel; the lower edge of the display panel is higher than the upper edge of the light source assembly. The display brightness stabilizing method has the effect of stabilizing the display brightness.

Description

Reflection screen

Technical Field

The application relates to the technical field of display, in particular to a reflecting screen.

Background

The prior display screen can be divided into a transmission type display screen and a reflection type display screen according to the arrangement of light sources, wherein the transmission type display screen comprises a display panel and a backlight source arranged at one side of the display panel far away from a spectator, and white light emitted by the backlight source penetrates through the display panel to display images; the light of the reflective display screen comes from one side of the display panel close to the audience, and the light irradiates the micro display unit on the surface of the display panel to reflect the image.

The reflective display screen can be further divided into an active reflective screen and a passive reflective screen according to the source of light, the passive reflective screen does not carry a light source and only relies on ambient light to realize image display, and an ink screen commonly used for reading electronic books belongs to the category of the passive reflective screen; the active type display panel comprises an internal or external light source for replacing or supplementing the ambient light to enable the display panel to reflect images.

The existing reflecting screen is greatly influenced by ambient light, and the passive reflecting screen has soft and clear display effect under the condition of high ambient brightness, but has darker display effect and blurred display under the darker environment; the active reflecting screen has good display effect under the condition of dark environment, but the contrast ratio of the whole picture is poor under the condition of strong light. In addition, since the display brightness of either the active or passive reflective screen varies with the intensity of the ambient light, a large burden is imposed on the eyesight of the user, and thus a reflective display screen having a stable light emitting effect and being not affected by the ambient light is demanded.

Disclosure of Invention

In order to solve the problems, the light emitting effect of the reflective display screen is not changed due to fluctuation of environmental conditions.

The reflecting screen adopts the following technical scheme:

a reflective screen, comprising:

the display assembly comprises a display panel, wherein the display panel comprises a plurality of micro display units, the display surface of each micro display unit is a plane and is used for receiving light source light rays and reflecting display light rays with image information, the display panel extends in a first direction, the projection of the light emitting surface of the display panel on the plane perpendicular to the first direction is a conical curve, and the extending line of the normal line of any micro display unit is intersected with the ground; and

the focal point of the conical curve falls in the light source assembly, and the light emergent angle of the light source assembly covers the whole display panel;

the lower edge of the display panel is higher than the upper edge of the light source assembly.

By adopting the technical scheme, the light emitted by the light source assembly is reflected to the direction of the audience by the real panel, most of the ambient light is reflected to the ground, and a small part of the ambient light is reflected to the upper part of the audience, only a small part of the ambient light can be mixed in the display light to be transmitted to the direction of the audience, and the micro display units meeting the refraction conditions of the ambient light at different angles are different from each other, so that the small part of the ambient light can be diluted by the whole display panel, the brightness of the display image which can be observed by the audience is kept stable, and obvious fluctuation can not occur due to the change of the ambient light.

Optionally, the conic section is a portion of a parabola.

By adopting the technical scheme, the light source light rays emitted from the parabolic focus are changed into parallel display light rays through reflection of the display panel.

Optionally, the conic section is a portion of an ellipse.

By adopting the technical scheme, the light source light rays emitted from the elliptic focus are converged to the other focus of the ellipse through the reflection of the display panel, and the reflection screen is suitable for a reflection screen with larger size.

Optionally, the light source assembly includes light source and lens group, the lens group including set up in proper order in the collimating lens and the divergent lens on the light-emitting path of light source, collimating lens's focal power is positive for assemble with the collimation the light that the light source sent, divergent lens's focal power is negative for make the collimated light diverge, divergent lens be close to the focus of light source one side with conic section's focus coincidence.

By adopting the technical scheme, the light rays emitted by the light source are collimated and then diverged, and the angles of the emergent light rays of the light source are controlled by the diverged lens, so that the light rays are easier to calibrate.

Optionally, a side of the collimating lens, which is close to the light source, is a plane.

By adopting the technical scheme, the collimating lens converges light and is distributed to the light emitting surface and the light entering surface, the deflection angle on each surface is uniform, the aberration is smaller, and the imaging effect is better.

Optionally, a side of the diverging lens remote from the light source is planar.

By adopting the technical scheme, the divergence of the divergent lens to the light is distributed to the light emitting surface and the light entering surface, the deflection angle on each surface is uniform, the aberration is smaller, and the imaging effect is better.

Optionally, the light source is a COB lamp panel or a high-pressure mercury lamp.

By adopting the technical scheme, the light source has high brightness, mature production process and low cost.

Optionally, each micro display unit includes pixels of three colors of red, green and blue.

By adopting the technical scheme, the micro display unit can reflect colored display light after being irradiated by light source light.

Optionally, the light density of the outgoing light beam of the light source assembly increases from bottom to top so as to make the illuminance on the display panel uniform.

By adopting the technical scheme, the light density of the emergent light beam of the light source component increases from bottom to top, and the area of the display panel corresponding to the unit direction angle taking the light source component as the top angle increases from bottom to top, so that the brightness of each micro display unit is similar, and the illumination of the whole display panel is uniform.

Optionally, the display assembly further includes a protective layer, where the protective layer covers a side of the display panel facing away from the light emitting surface.

Through adopting above-mentioned technical scheme, the protective layer can play buffering shock attenuation's effect, protection display panel.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the light emitted by the light source component forms parallel light or is converged at the other focus of the elliptic curve through the reflection of each micro display unit on the display panel, so that the light collimation degree is good, and the light utilization efficiency is high;

2. because the extension line of the normal line of each micro display panel is intersected with the bottom surface, namely, all the micro display panels incline downwards, most of ambient light can be reflected to the ground after being irradiated to the display panels, and the visual experience of audiences is not affected;

3. the light intensity of the emergent light beam of the light source assembly increases from bottom to top to compensate the distance difference between the upper side and the lower side of the display panel, so that the light received by the display panel in unit area is uniform.

Drawings

FIG. 1 is an optical path diagram of a reflective screen of embodiment 1 of the present application;

FIG. 2 is an enlarged partial view of area A of FIG. 1;

FIG. 3 is an internal light path diagram of a light source assembly of embodiment 1 of the present application;

fig. 4 is an optical path diagram of a reflection screen of embodiment 2 of the present application.

Reference numerals illustrate: 1. a display assembly; 11. a display panel; 111. a micro display unit; 12. a bracket; 2. a light source assembly; 21. a light source; 22. a lens group; 221. a collimating lens; 222. a diverging lens.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-4.

The reflecting screen is a display screen which uses the light from the side of the display panel close to the user to display images, and can be further divided into an active reflecting screen and a passive reflecting screen according to whether the light source is arranged or not. However, the existing reflective screen is severely limited in display effect by environmental conditions, specifically: the active display screen is clearer under the condition of weaker light intensity, and when the ambient light is stronger, the light intensity provided by the light source in the specific direction can be diluted by the ambient light, so that the whole display picture has lower contrast and dark color; the passive display screen has good display effect and saves energy under the condition of high light intensity, but the display brightness of the passive display screen is gradually reduced along with the weakening of the ambient light until the image cannot be displayed thoroughly.

In addition, the display panel of the reflective screen is actually composed of an array of numerous micro display units, and each individual micro display unit usually includes pixels of three colors of red, green and blue in order to display different colors and brightness of each pixel of the image. Theoretically, the ratio of three colors of each micro display unit and the brightness ratio between the micro display units are controlled by a program, and the whole display panel presents a preset image under uniform surface light source irradiation. In fact, on one hand, the light rays in the real state are not perfect area light sources, even if the light rays are active reflection screens, the light rays can also show plaque or stripe-shaped intensity change under the interference of ambient light, and the light rays are more so, even if the light rays are passive reflection screens which completely depend on the ambient light for imaging; on the other hand, for a specific microdisplay unit, there is an upper limit to the reflection of light by the pixels of red, green and blue colors, and the upper limit of the pixels of different colors is different due to material limitation, that is, as the intensity of light received by the microdisplay unit continuously increases, once the intensity of light exceeds the upper limit of one color, the absolute light intensity of the color occupied by the light in the outgoing light of the microdisplay unit will be maintained at a certain absolute value, while the light intensities of the other two colors continue to increase with the increase of the incident light intensity, so that the relative proportion of the two colors in the outgoing light of the microdisplay unit increases, resulting in color distortion of the pixels, and the brightness loss of a part of the microdisplay unit may cause contrast confusion of the whole image in macroscopic view.

The embodiment of the application discloses a reflecting screen.

Example 1

Referring to fig. 1, the reflection screen includes a display unit 1 and a light source unit 2, the light source unit 2 emits light of a light source 21 having a solid color and not carrying image information, the light of the light source 21 is irradiated to a surface of the display unit 1, and display light having the image information is reflected, and then, the display light is observed by a viewer.

Referring to fig. 2, the display assembly 1 includes a bracket 12 and a display panel 11 fixedly disposed on the bracket 12, the display panel 11 includes a plurality of micro display units 111 arranged in an array, each micro display unit 111 includes three color pixels of red, green and blue, and the display surfaces of the micro display units 111 are combined to form a light emitting surface of the display panel 11. The first direction is set to be parallel to the ground and perpendicular to the viewing direction of the viewer, the display panel 11 extends along the first direction, and the projection of the light emitting surface of the display panel 11 in the direction perpendicular to the first direction is a conic curve, which in this embodiment is a part of a parabola.

The light source assembly 2 is disposed between the viewer and the display assembly 1 and is positioned at the focus of the parabola, and the height of the upper edge of the light source assembly 2 is lower than the height of the lower edge of the display panel 11.

Referring to fig. 3, the light source assembly 2 includes a light source 21 and a lens group 22, wherein the light source 21 is a high-pressure mercury lamp or COB lamp panel, the lens group 22 includes a collimating lens 221 and a diverging lens 222 sequentially disposed on a light-emitting path of the light source 21, and the focal power of the collimating lens 221 is positive for converging and collimating the light emitted by the light source 21; the power of the diverging lens 222 is negative for diverging the collimated light, and the focal point of the diverging lens 222 on the side close to the light source 21 coincides with the focal point of the conic section. The optical axis of the light-emitting optical path of the light source 21 coincides with the optical axis of the divergent lens 222 and the optical axis of the collimator lens 221.

Preferably, the collimating lens 221 is a plano-convex lens, and a surface of one side thereof adjacent to the light source 21 is a plane; the diverging lens 222 is a plano-concave mirror, and a side surface thereof remote from the light source 21 is a plane.

Preferably, the light density of the light beam emitted from the light source 21 increases from bottom to top to ensure uniform illumination of each micro display unit 111 on the display panel 11.

It should be noted that the shape of the light source assembly 2 in the first direction and the inclination of the micro display unit 111 in the first direction are not particularly limited in this embodiment, and may be adjusted accordingly by those skilled in the art according to actual installation conditions. Optionally, the light source 21 is a light bar extending in a first direction, and the collimating lens 221 and the diverging lens 222 of the lens group 22 also extend in the first direction, and the display surface of each micro display unit 111 is parallel to the first direction; alternatively, the light source 21 projects a circular light spot, the projections of the collimating lens 221 and the diverging lens 222 of the lens group 22 on a plane perpendicular to the respective optical axes are circular, all the micro display units 111 are symmetrical with a plane perpendicular to the ground passing through the light-emitting optical axis of the light source assembly 2, and each micro display unit 111 not on the plane deflects toward the direction of the plane, so that the light of the light source 21 is parallel to the plane after being reflected.

Preferably, the display assembly 1 further comprises a protective layer, and the protective layer is arranged between the bracket 12 and the display panel 11 to play a role in buffering and damping.

For example, when the present embodiment is applied to decoration of a home video room, a carpet may be laid between the light source assembly 2 and the display assembly 1 to have a light absorption effect, and interference of ambient light from the floor on the display effect may be further suppressed while preventing glare of the floor.

The implementation principle of the embodiment 1 is as follows:

from the aspect of the micro display unit 111, the micro display unit 111 of the present embodiment adopts a different light reflection form from the micro display unit 111 structure in the related art. The main-stream reflective screen represented by the ink screen in the market at present is not limited to the irradiation direction of the ambient light and the viewing direction of the user, and therefore, diffuse reflective dots are arranged on the surface of each micro display unit 111, or a layer of diffuse reflective film is covered on the surface of the whole display panel 11, so that although the difference between forward light and reverse light viewing is some Xu Liangdu and the color development difference, the viewing effect of the ink screen is kept in a relatively clear category no matter whether the viewing direction is symmetrical to the direction of the ambient light about the normal line of the display panel 11. The display surface of each micro display unit 111 in the present embodiment is a plane, and specular reflection is performed on the unit incident on the micro display unit 111, and the normal line of each micro display panel 11 is obliquely directed to the ground between the light source assembly 2 and the user, so that the light from the light source assembly 2 is reflected toward the user, and most of the ambient light is reflected toward the ground by the micro display unit 111, thereby realizing shielding of the ambient light.

In addition, the modulation of light by the micro display unit 111 is a process of transmission and excitation, specifically, the light transmits through the display surface of the micro display unit 111, irradiates and excites the pixel points in the micro display unit 111, and the stimulated light of the pixel points is emitted through the display surface. The display surface of the micro display unit 111 is arranged in a plane such that when light is irradiated to the surface of the micro display unit 111, there is a total reflection phenomenon, and the light is not transmitted into the micro display unit 111, and is reflected only on the display surface of the micro display unit 111, so that the excitation capability of the pixel point is not occupied. The light emitted by the light source assembly 2 has a constant angle, so that successful transmission of the light can be ensured, and therefore, the light which is filtered by total reflection belongs to ambient light with an indefinite direction, more pixels of each micro display unit 111 are excited by the light source assembly 2, and the color contrast of the micro display unit 111 under the condition of high display brightness is improved.

The curve of the display panel 11 near the light source assembly 2 is a segment of a parabolic curve when viewed from the plane of the display panel 11, and the light source 21 is disposed at the focus of the parabola, that is, the divergent light emitted from the light source assembly 2 becomes parallel light after being reflected by the display panel 11, and is transmitted to the angle of the viewer. Most of the ambient light other than the light from the light source 21 of the light source assembly 2 is reflected to the ground, a small portion is reflected to the upper side of the user, and only a small portion of the ambient light is transmitted into the eyes of the user through the reflection of the display panel 11. Moreover, the inclination angles of the ambient light from different angles, which satisfy the reflection to the micro display unit 111 in the eyes of the user, are different, in other words, even the very small portion of the ambient light enters the eyes of the user through the reflection of the different micro display units 111, and the brightness increase caused by the portion of the ambient light is diluted by the whole display panel 11, which is not obvious.

In the light source assembly 2, the light emitted by the light source 21 is a diffuse light having a certain beam angle, for the COB light source 21, the angle is usually 120 °, the diffuse light is refracted by the collimator lens 221, and is converged into parallel light, and then the light is modulated by the divergent lens 222 to become divergent light source 21, the divergent light source 21 irradiates the display assembly 1 for imaging, the light source 21 corresponds to a divergent light beam emitted from a focus of the divergent lens 222 near the light source 21, and the beam angle and the emitting point of the divergent light beam are determined by parameters such as a focal length and a caliber of the divergent lens 222. Since the focal point of the diverging lens 222 near the light source 21 coincides with the focal point of the parabola corresponding to the display panel 11, the light of the light source 21 becomes parallel light after being reflected by the display panel 11, and the ambient light other than the light of the angle of the light source 21 cannot propagate in the direction of the parallel light after being reflected by the display panel 11.

In addition, for the collimating lens 221 and the diverging lens 222, the deflection of the light beams is uniformly distributed to the light emitting surface and the light entering surface, the aberration is smaller, and the imaging effect is better.

In summary, the reflective screen of the present embodiment is viewed from the viewing angle of the viewer, and the display image has stable brightness and color contrast regardless of the ambient light.

Example 2

Referring to fig. 4, this embodiment is different from embodiment 1 in that:

the projection of the light exit surface of the display panel 11 on the plane perpendicular to the first direction in this embodiment is a part of an ellipse, and the light source assembly 2 is disposed at a focus of the ellipse on a side close to the display assembly 1.

The implementation principle of the embodiment 2 is as follows:

for larger-sized screens, especially for higher-height screens, the parallel surface light sources 21 may have poor viewing effect for the viewers about the edges of the screen, so that the micro display units 111 of the embodiment are distributed along an elliptical line, so that the light rays of the light sources 21 emitted by the light source assembly 2 are reflected by the display panel 11 and then focused at the other focal point of the ellipse. For large-sized screens, the reflective screen of the present embodiment enables a more comfortable viewing experience.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (10)

1. A reflective screen, comprising:

the display assembly (1), the display assembly (1) comprises a display panel (11), the display panel (11) comprises a plurality of micro display units (111), the display surface of each micro display unit (111) is a plane and is used for receiving light rays of a light source (21) and reflecting display light rays with image information, the display panel (11) extends in a first direction, the projection of the light emitting surface of the display panel (11) on the plane perpendicular to the first direction is a conical curve, and the extension line of the normal line of any micro display unit (111) is intersected with the ground; and

the focal point of the conical curve falls in the light source assembly (2), and the light emergent angle of the light source assembly (2) covers the whole display panel (11);

the height of the lower edge of the display panel (11) is higher than the height of the upper edge of the light source assembly (2).

2. The reflective screen of claim 1 wherein said conic section is a portion of a parabola.

3. The reflective screen of claim 1 wherein said conic section is a portion of an ellipse.

4. The reflecting screen according to claim 1, wherein the light source assembly (2) comprises a light source (21) and a lens group (22), the lens group (22) comprises a collimating lens (221) and a diverging lens (222) which are sequentially arranged on a light emergent path of the light source (21), the focal power of the collimating lens (221) is positive and is used for converging and collimating light rays emitted by the light source (21), the focal power of the diverging lens (222) is negative and is used for diverging collimated light rays, and a focal point of one side, close to the light source (21), of the diverging lens (222) coincides with a focal point of the conical curve.

5. A reflective screen according to claim 4, characterized in that the side of the collimator lens (221) close to the light source (21) is planar.

6. A reflective screen according to claim 4, wherein the side of the diverging lens (222) remote from the light source (21) is planar.

7. A reflective screen according to claim 4, characterized in that the light source (21) is a COB panel or a high-pressure mercury lamp.

8. A reflective screen according to claim 1, wherein each of said micro-display units (111) comprises pixels of three colors red, green and blue.

9. A reflective screen according to claim 1, wherein the light density of the outgoing light beam of the light source assembly (2) increases from bottom to top to make the illuminance on the display panel (11) uniform.

10. A reflective screen according to claim 1, characterized in that the display assembly (1) further comprises a protective layer covering a side of the display panel (11) facing away from the light exit surface.