DE7225976U - ILLUMINATED SCREEN FOR COLOR TELEVISION CONTROL PANELS - Google Patents

Description

Il 1 I ^: '

SÜDDEUTSCHER RUNDFUNK Stuttgart, the

. -anstalt under public law Pat / Zi / Be. - Reg. 522

Illuminated screen wall for color television control receivers

The screen of a color television control receiver (color monitor or color image projection receiver), in contrast to the screen of a cinema film projector, only takes a small one Angular range in the field of view of an observer of the picture a.

^ he picture impression that an observer when looking at a Color television picture is therefore, among other physiological factors, also on the size and brightness of the Screen environment influenced. This influence of the environment on the subjective color perception of the observer as well as on its subjective perception of gradation distortions in the television picture is particularly important when assessing Color films for their suitability for color television as well as for detection, assessment and electronic correction the color error of color films during the television transmission of these color films, or when the observer of the television picture those in the picture design and recording of the event

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provided artistic and technical! effects with the best possible Should perceive image reproduction quality.

In the known optical projection devices for testing color films for color television, the environment the projection screen formed by a flat, translucent screen wall lying in the projection screen plane, which is illuminated from behind by fluorescent tubes so that with it a favorable one for the observer of the projection screen Illumination of the projection screen environment is achieved.

As shown in Fig. 1, this known, flat screen wall 1, which is usually three times the width of the projection screen 2, only takes a small angular range of the field of view, usually a distance of four to six times the screen height in front of the screen Screen 2 seated observer 3, whereby only a small area of the presentation room 4 lying in the field of view of the observer 3 is shielded from the observer 3. This screening of the projection room 4 from the field of view of the observer 3 of the screen 2 is inadequate in television image control rooms where a television control receiver is used in the environment 1 instead of the film projection screen, since in television image control rooms, especially in rooms for electronic correction of color films, as opposed to a large number of projection rooms

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is installed by devices that are provided with control devices, signal noise and chrome-plated or shiny parts. This unavoidable light reflecting points dazzle the observer 3, or direct it from the screen 2 from _r so that its assessment of the color quality is adversely affected. Similar conditions apply to exhibition, sales and living rooms, v / eil here too the observer of the screen 2 is disturbed by lamps and shiny parts of furnishings.

The innovation is based on the task of changing the visual field of the Observer of the screen of a color television control receiver through a specially designed, translucent screen wall shield against the television picture control room and its equipment so that the screen wall illuminated from behind on the one hand one that is optimally illuminated for the subjective assessment of the color quality of the reproduced color television picture Represents the environment and on the other hand the observer of the screen shields against "disturbing" light sources and light reflection points in the control room.

The innovation solves this problem in that the screen wall consists of a preferably rigid, rectangular, transparent one and neutral gray, as well as the light-diffusing plastic film, which is in a stable frame in a vertical position

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Guhaltert is that you have an opening for the control bowl anger provided middle part is flat and plane-parallel to the front panel of the housing of the control receiver and its The screen plane runs while you two equally wide side parts are curved in a parabolic shape towards the screen observer or are bent circularly from the middle part to the observer and that the screen wall is clear in its height and Width as well as in the curvature and clear depth of its two side parts is dimensioned so that it is the field of view of a in front of the control receiver for observation and assessment of the screen image quality of the seated observer completely against shields self-luminous or light-reflecting objects on the side or behind the control receiver.

An embodiment of the innovation is shown schematically in Figures 2, 3 and 4 and is explained in more detail below.

The shown in Fig. 2 according to the innovation Schiimwand for color television control receiver consists of a rectangular, translucent and scattering, neutral gray plastic film 5, which are vertically in a U-shaped, laterally through opaque, solid panels closed, but open at the back, z. B. frame made of light metal, plastic or wooden parts 6, on each zv / egg above and below attached parabolic shape curved guide rails 7 and 8 with z. B. rectangular or

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U-shaped cross-section or on four inside the frame 6 inserted above and below parabolic shaped Corner pieces 9, 10, 11 and 12 and on the frame 6 itself and on the face of the housing 13 for the Control receiver 1A- depending on the stiffness of the plastic film is stretched taut or self-supporting so that they merge tangentially into the central part 15 in a flat central part 15 and in two equally wide, parabolic curved ones Side parts 16 and 17 is divided.

The two side parts 16 and 17 are also with their free side edges on the free longitudinal edges of the legs of the U-shaped Frame 6 attached.

The flat central part 15 of the screen wall 5 according to the invention completely shields an observer 3 sitting in front of the control receiver 14 towards light sources and light reflection points, which are located behind the housing 13, while the two to Observer 3 towards parabolic curved side parts 16 and 17 of the screen wall 5 the observer 3 compared to the rest of the Shield light sources and light reflection points from the control room.

The one with its back on the front wall of the housing 13 for the Control receiver .14 adjacent and attached middle part 15 has the standardized width a of the control receiver housing 13 and is

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at the level of the screen 18 built into the housing 13 or inserted control receiver 14 with a rectangular Provided an opening for the control receiver 14 so that it can be removed from the housing 13 towards the front.

The dimensions of the two parabolic side parts 16 and 17, ie their clear width y ₁ and clear depth X ₁ and their curvature, are explained with reference to FIG. 3, which shows a horizontal section through the arrangement shown in FIG.

An optimally favorable size of the area surrounding the screen 18 is obtained when the bottom surface of the U-shaped frame is three times the width a of the housing 13 and thus the two side parts 16 and 17 of the screen wall 5, each forming one of the widths, forming the symmetry halves of a parabolic cylinder a of the housing 13 have corresponding clear width y ^ (y., = CB = C ¹ B ¹ ).

The length of the two legs CA and C ¹ A ^{1 of} the frame and thus the clear depth x. the two side parts 16 and 17 attached with their free side edges to the free longitudinal edges of the two legs CA and C ¹ A ¹ is to be dimensioned so large that an observer sitting in front of the screen 18 at a distance d corresponding to four to six times the screen height Screen wall sees under an observation angle of almost or equal to 180 °.

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The curvature of the two overlooks the middle part 15 tangentially Side parts 16 and 17 can be easily removed from the par ^ -el-

2
Determine equation y = 2px, where the parameter ρ is the size

ν ²
P = H_ ha / t and x ^ and y ^ are the clear widths and depths of the two side parts 16 and 17.

A simplified version of the environment of the screen 18, i. H. the curvature of the two side parts 16 and 17 .can be in the Manner, dax3, as shown in Fig. 4, the two Side parts 16 and 17 adjoining the central part 15 are initially curved in a circular manner and then tangentially into a surface pass over. The radius of curvature of the circularly curved parts of the two side parts is preferably derived from the parabolic equation to determine y = 2px, d. H. equal to the curvature of the parabolic 2

2p = ^V 1 of the two parabolic x shown in FIG. 3.

Side parts 16 and 17 to be measured.

Behind the central field 15 of the transparent screen wall 5 according to the innovation, the fluorescent tubes 19 and 20 are at the rear Part of the housing 13 above and laterally attached so that on the one hand they illuminate the transparent screen wall 5 from behind and thus, because of the light-scattering effect of the plastic film 5, the subjective image assessment of the front of the television control receiver 14 seated observer 3 generate favorable influencing screen environment, but on the other hand the

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are withdrawn from the direct view of the observer 3 in that the front, upper edge of the housing 13 is the one on the housing 13 attached fluorescent tube 19 and the front side edges of the housing 13, the two on the right and left of the housing Cover attached fluorescent tubes 20 with respect to the observer 3, whereby the observer 3 in the image assessment disruptive partial brightening of the screen area uniformly illuminated in the middle field 15 is prevented.

The fluorescent tubes 20 attached laterally to the rear part of the housing 13 are also far from the housing 13 laterally offset that the light emitted by them the parabola-shaped curved side parts 16 and 17 at their tangent to free side edges.

The height of the U-shaped frame 6 is adapted to the height of the equipment cabinets usually arranged next to it and is preferably chosen so large that an observer standing in front of the control receiver 14 also sees the television picture can judge on the screen 18. The height of the frame end steep 6 is chosen so large that the height of the above at eye level of the seated observer 3 built-in control receiver 14 located part of the central field 15 of the transparent Screen wall 5 is equal to or greater than the height of the front panel of the control receiver 14 built into the screen wall 5.

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The inner surfaces facing the parabolic curved side parts 16 and 17 of the screen wall on the side of the U-shaped. Frame 6 attached, opaque, solid plates are provided with a white paint or covering. That on These inner surfaces of the stable plates reflected light attached to the rear part of the housing 13 at the top and side Fluorescent tubes 19 and 20 thereby contribute to the illumination of the transparent screen environment. In addition, the white paint or covering prevents the color of the sides, which are preferably made of wood Panels of the frame 6 through the screen wall, d. H. shines through the transparent plastic film 5 and the Color temperature of the surrounding area is falsified.

The U-shaped frame 6 is from above by a nbht drawn cover plate, the underside of which is also provided with a white paint or coating, covered, on the one hand the soiling of the screen wall by dust deposits to prevent, on the other hand to the field of view of the observer of the screen 18 upwards through a bright surface to delimit.

In front of the control receiver 14 is within by the screen wall In the delimited space, a table top 21 which can be pushed out and mounted on feet preferably provided with sliding curves

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arranged, uie on the one hand to control and regulate the Technical devices in the control room, v / ie film scanners and color correction device, contains required 3 media devices, on the other hand, it also ensures that the observer 3 of the screen 18 sitting in front of the table top is always the the best viewing distance to the control receiver 14 is equal to four to six times the screen height.

After the table top 21 has been removed from the frame 6, the control receiver 14 inserted on telescopic rails into the housing 13 can, for. B. to carry out a check, readjustment or repair in a simple manner pulled out of the housing and, if _t necessary, can be replaced.

Compared to a flat screen wall, the screen wall according to the innovation has in particular the following advantages:

The angular area of the field of view of an observer sitting in front of the screen that is shielded by it is two to three times as large as the angular area that is shielded by a flat screen wall of the same width. With it, the light from the screen wall lighting attached to the side and top of the housing of the control receiver is incident vertically in the immediate vicinity of the screen. As the distance from the screen increases, it falls on the two square-shaped curved side parts of the screen wall

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Rait steadily smaller angles and tangier-c the Finally, the screen wall along its side edges. Through this conditional, represents the rear of the control receiver ^ ehäuse arranged screen wall lighting, illuminated screen wall represents an illuminated area around the screen, that has a constant luminance in the immediate vicinity of the screen, which then goes to the edges of the screen decreases steadily and almost without contrast in the luminance of the only moderately illuminated area around the screen wall transforms.

The enlargement of the illuminated area around the screen achieved with the screen wall according to the innovation is essential to stabilize the adaptation of the observer's eye and thus to the subjectively correct perception of image white and image black by the observer.

The constant and contrast-free decrease in the surrounding luminance towards the edge zones of the observer's field of vision, caused by the parabolic curvature of the screen wall, results in a favorable transition from the high luminance of the surroundings in the immediate vicinity of the screen to the low luminance of the only moderately illuminated image control room.

The screen wall according to the innovation completely shields the observer from his surroundings, so that in the design of a

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TV picture control room no special structural or interior architectural measures are required, such as ζ. Β. Paint the walls, ceiling and floor of the image control room gray or black or with dark, neutral gray fabrics disguise in order to avoid the disruptive influences emanating from the technical devices set up in the image control room To switch off image assessment.

- Protection claims -

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Claims (9)

1. Illuminated screen wall for color television picture control receivers for the production of the observation and examination of the Scairra image quality favoring, illuminated environment of the screen, characterized in that it consists of a preferably three-dimensional, rigid, rectangular, transparent and neutral gray, as well as plastic film (5) that diffuses the Liehe, which is held vertically in a stable frame (6) so that you have an opening for the screen (18) of the control recipient (14) provided. Middle part (15) is flat and plane-parallel to the front panel of the housing (13) of the Control receiver (14) and its screen level runs, while its two equally wide side parts (Io and 17) are curved or parabolic towards the screen observer (3) are bent circularly from the middle part (15) to the observer (3) and that the screen wall unl open in height Width, as well as the curvature and clear depth of its two side parts (16 and 17) is dimensioned so that it covers the field of view an observer (3) sitting in front of the control receiver (14) to observe and assess the screen image quality completely against self-luminous or light-reflecting objects located to the side or behind the control receiver (14) shields. - 14 - 722597626.10.72 Horse. 522 - 14 - 2. Screen wall according to claim 1, characterized in that the two aass parabolic curved or circular from the central part The bent side parts (16 and 17) of the screen wall merge tangentially into its flat central part (15). 3. Screen wall according to Claims 1 and 2, characterized in that that the two parabolic curved or circularly bent side parts (16 and 17) of the screen wall are the same clear width y .. and have the same clear depth x ,,. 4. Screen wall according to Claims 1 to 3, characterized in that that the width of the flat middle part (15) and the clear width y .. of the two side parts of the screen wall each 1/3 of Take up the clear overall width of the screen wall and the latter preferably equal to three times the width of the receiver housing (13) is dimensioned. 5. screen wall according to claims 1 to 4, characterized in that that the clear depth x .. of the screen wall or its two curved ones Side parts (16 and 17) sized so large that the shielded by the screen wall angle of view of a Screen (18) in a z. B. the distance of seated observer (3) corresponding to four to six times the screen height is nearly or equal to 180 °. - 15 722597626.10.72 Reg. 522 - 15 - 6. Screen wall according to one of claims 1 to 5, characterized in that that to brighten the area around the screen (18) the two lateral, massive plates of the Frame (6) are provided on their inner surfaces with a highly reflective coating or paint. 7. screen wall according to claim 6, characterized in that to avoid falsification of the color temperature of the environment the covering or coating of the two solid side panels of the frame (6) is white. S. screen wall according to one of claims 1 to 5, characterized in that that the Leutstoffröhren (19 and 20) for lighting the screen wall on the rear part of the control receiver housing above and on the side without a special cover are attached in such a way that that it is covered by the front frame of the control receiver (14) for the observer (3) of the screen (18) and therefore are not directly visible. 9. screen wall according to claim 8, characterized in that the side at the rear of the control receiver housing (13) Attached fluorescent tubes (20) are attached at such a distance from the housing (13) that the emanating from them Light illuminates the screen wall from behind so that the luminance of the flat central part (15) is constant and the luminance the parabolic curved side parts decreases towards the two side edges of the screen wall and no more pronounced There is a greater difference in brightness between the lateral edge areas of the screen wall and its surroundings. 722597626.10.72