TW202119883A - Manufacturing method of curved display device capable of preventing light leakage problem for the display panel and effectively enhancing quality of displayed images - Google Patents

Abstract

A manufacturing method of curved display device includes the following steps: providing a predetermined radius of curvature and a predetermined arc length and calculating a quadrature height based on the predetermined radius of curvature and the predetermined arc length; curving the display panel, such that a center point of the display panel in a length direction is recessed in a depth direction by a center depth that is equal to the quadrature height; setting multiple measuring points between two sides of the display panel that are spaced in the length direction and the center point and measuring a depth of each measuring point recessed in the depth direction so as to obtain a recess depth; carrying out a calculating operation on the center depth and the recess depth for transformation into an arc-shaped reference line; and producing a curved display device according to the arc-shaped reference line. Thus, the display panel does not generate a light leakage problem, and the quality of a display imaged can be effectively enhanced.

Description

Method for manufacturing curved display device

The present invention relates to a method for manufacturing a curved display device, in particular to a method for manufacturing a curved display device designed for the curved surface of a display panel.

1 and 2, the curved surface design method of the conventional curved surface display device 1 first draws a perfect circle 10 with a radius of curvature r. Next, a length W of a middle part 111 of a display area 11 is calculated. The length W is calculated by multiplying a length of a flat display panel by a predetermined value. The length of the flat display panel is, for example, 600 mm, the predetermined value is, for example, 70%, and the length W value obtained by multiplying the two is 420 mm. After that, take the radius of curvature r marked in Figure 2 as the center line, and offset to the left and right by a predetermined distance respectively. The predetermined distance is half of the aforementioned value of 420 mm, which is 210 mm, so as to obtain on the perfect circle 10 Two tangent points 12. Two tangent lines 13 extend to the left and right sides through the two tangent points 12 respectively, and each tangent line 13 is tangent to the perfect circle 10 through the corresponding tangent point 12. Thereby, an arc 101 and two tangents 13 of the perfect circle 10 in the two tangent points 12 together form an arc reference line 14. This arc reference line 14 is the reference for the subsequent bending processing of the flat display panel, so that the flat display The panel can be bent into the same curved shape as the arc-shaped reference line 14.

However, the aforementioned method may cause the problem of stress concentration at the position of the corresponding tangent point 12 in the curved display panel, which causes the light leakage problem of the curved display device 1.

Therefore, an object of the present invention is to provide a method for manufacturing a curved display device that can overcome at least one of the disadvantages of the prior art.

Therefore, the manufacturing method of the curved display device of the present invention includes the following steps:

Provide a preset radius of curvature and a preset arc length, calculate a chord height from the preset radius of curvature and the preset arc length, the preset arc length and a length taken by a display panel along a length direction the same;

Bending the display panel so that a center point of the display panel in the length direction is recessed along a depth direction perpendicular to the length direction and a center depth is the same as the chord height;

A plurality of points to be measured are set between two sides of the display panel spaced apart along the length direction and the center point, and the depth of each point to be measured recessed in the depth direction is measured to obtain a recess depth;

Perform arithmetic processing on the depth of the center and the depth of the depression to convert an arc-shaped reference line; and

A curved display device is manufactured according to the arc-shaped reference line.

In the method for manufacturing a curved display device of the present invention, in the calculation processing step, the center depth, the recess depth, the distance between the center point and the corresponding adjacent point to be measured, and every two adjacent points The distance between the points to be measured and the distance between each side and the corresponding point to be measured. Calculate the point coordinate value and input it into a processing software, so that the processing software generates a trend line equation, and then enter it The trend line equation is transferred to a drawing software to generate the arc-shaped reference line.

In the method for manufacturing a curved display device of the present invention, the waiting point is symmetrical along the length direction with the center point as an axis, and the center point is spaced apart from the corresponding adjacent point to be tested along the length direction by a distance, every two The adjacent points to be measured are spaced apart along the length direction by the distance, and each side edge is spaced from the corresponding adjacent point to be measured by the distance along the length direction.

The method for manufacturing a curved display device of the present invention first substitutes the preset radius of curvature and the preset arc length into an arc length formula to calculate a central angle, and then substitutes the preset radius of curvature and the central angle into a chord Long formula to calculate a chord length, add 2 to the number of waiting measurement points to calculate the number of waiting measurement points and the number of sections defined by the center point on the display panel, and divide the chord length The number of segments is used to obtain the spacing value.

The manufacturing method of the curved display device of the present invention calculates the coordinate value of the y-axis point corresponding to the processing software through the center depth and the depression depth, and through the distance between the center point and the corresponding adjacent point to be measured, The distance between every two adjacent points to be measured and the distance between each side edge and the corresponding point to be measured are calculated to correspond to the x-axis point coordinate value of the processing software.

In the method for manufacturing a curved display device of the present invention, when calculating the chord height, first substitute the preset radius of curvature and the preset arc length into an arc length formula to calculate a central angle, and then the preset radius of curvature And the central angle is substituted into a chord height formula to calculate the chord height.

In the method for manufacturing a curved display device of the present invention, the waiting point is symmetrical along the length direction with the center point as the axis. When measuring the depth of each point to be measured, an actual depth is obtained first, and then the judgment is made according to the actual depth. The depth of the recess is determined so that the depth of the recess is the same for every two points to be side symmetrical about the center point along the length direction.

In the method of manufacturing the curved display device of the present invention, the actual depth value of the two symmetrical points to be measured is judged, if the two actual depth values are the same, the value is used as the recess depth, and if the two actual depth values are different, proceed Fine-tuning and correction, taking the average of the two actual depth values as the depth of the depression.

In the method for manufacturing a curved display device of the present invention, the steps of manufacturing the curved display device include:

The arc reference line is set as a center line of the display panel after bending, and an arc-shaped assembly line with the same shape as the arc-shaped reference line is offset based on the arc-shaped reference line, and the arc-shaped assembly line Set as the assembly position of an arc-shaped back shell;

Manufacture the arc-shaped back shell with the same arc as the arc-shaped assembly line; and

Assembling the display panel on the arc-shaped back shell makes the display panel bend and deform according to the curvature of the arc-shaped back shell.

In the method for manufacturing a curved display device of the present invention, the curved back shell has an curved front frame surface with the same curvature as the curved assembly line, and the display panel is adhered to the curved front frame surface through an adhesive member.

The effect of the present invention is that there is no tangent point between the arc-shaped reference line as the centerline of the curved display panel and the perfect circle formed by the preset radius of curvature, so that the display panel will not be affected by the tangent point. The problem of stress concentration and light leakage can be generated, which can effectively improve the quality of the display screen.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numbers.

3 is a flowchart of an embodiment of a method of manufacturing a curved display device of the present invention, which includes a calculation step S1, a curved display panel step S2, a measurement step S3, a calculation processing step S4, and a manufacturing step S5.

，便能計算出圓心角θ的大小。在本實施例中，顯示面板3的尺寸是以27吋為例，其長度L’是例如為609mm，因此，預設弧長L是設定為609mm，預設弧長L的數值是隨著長度L’的大小而變化。預設曲率半徑R則是設定為例如1200mm。將前述預設弧長L及預設曲率半徑R的數值代入前述弧長公式所計算出的圓心角θ為29.09度。而後再將前述預設曲率半徑R及圓心角θ的數值代入一弦高公式h＝R－

×R，便能計算出弦高h的大小為38.44mm。最後，將前述預設曲率半徑R及圓心角θ的數值代入一弦長公式d=2×

×R，便能計算出弦長d的大小為602.53mm。3, 4, and 5, in the calculation step S1, a preset radius of curvature R and a preset arc length L are provided. The preset arc length L is the same as a length L′ taken along a length direction X of a flat display panel 3 used in this embodiment. The preset radius of curvature R is the radius of curvature required of the display panel 3 after the curved display device 300 (as shown in FIG. 16) of this embodiment is manufactured. An arc 2 is drawn by the preset radius of curvature R. The two end points 21 of the arc 2 located at the opposite ends of the left and right ends and the two preset curvature radii R connecting the two end points 21 together form a curve as shown in FIG. 5.范形结构20。 Fan-shaped structure 20. The sector structure 20 has a central angle θ. By substituting the preset radius of curvature R and the preset arc length L into an arc length formula L=

, The size of the central angle θ can be calculated. In this embodiment, the size of the display panel 3 is 27 inches as an example, and its length L'is, for example, 609mm. Therefore, the preset arc length L is set to 609mm, and the value of the preset arc length L varies with the length The size of L'varies. The preset radius of curvature R is set to, for example, 1200 mm. Substituting the aforementioned preset arc length L and preset radius of curvature R into the aforementioned arc length formula, the center angle θ calculated is 29.09 degrees. Then, the values of the aforementioned preset radius of curvature R and the central angle θ are substituted into a chord height formula h=R-

×R, the chord height h can be calculated as 38.44mm. Finally, substitute the values of the aforementioned preset radius of curvature R and the central angle θ into a chord length formula d=2×

×R, the chord length d can be calculated as 602.53mm.

Referring to Figures 3, 5 and 6, in the step S2 of bending the display panel, an auxiliary jig (not shown) is used to clamp the display panel 3 and bend it, so that the display panel 3 is in a longitudinal direction X. A center depth DC recessed along a depth direction Y perpendicular to the length direction X of the center point C is the same as the chord height h. Among them, the center point C is located on a front panel surface 31 of the display panel 3, and the center depth DC is measured by the center point C and an imaginary surface I passing through the two sides 32 on the left and right sides of the display panel 3. For the measured vertical distance, the two sides 32 are spaced apart along the length direction X.

In the measurement step S3, first, a plurality of points to be measured P1 to P14 are set between each side 32 of the display panel 3 and the center point C, and then, to measure the points to be measured P1 to P14 along the depth direction Y The depth of the depression to obtain a depression depth.

Specifically, the multiple points to be measured P1 to P14 between one side 32 and the center point C, and the multiple points to be measured P1 to P14 between the other side 32 and the center point C are the center points C The axis is symmetrical along the length direction X. In this embodiment, the number of points P1 to P14 to be measured between each side 32 and the center point C is 14 as an example, so the total number of points to be measured P1 to P14 set on the display panel 3 is 28. The more the number of side points P1~P14 is set, the more depression depth values can be obtained as parameters for subsequent use, so as to improve the accuracy of the curvature of an arc-shaped trend line and an arc-shaped reference line required later . It should be noted that the set number of points to be tested can be adjusted to increase or decrease according to actual needs, and is not limited to the number disclosed in this embodiment.

The center point C and the corresponding adjacent point to be measured P1 are separated by a distance S along the length direction X, and every two adjacent points to be measured (for example, two adjacent points to be measured P1, P2) are spaced apart along the length direction X The distance S, and each side 32 and the corresponding adjacent point to be measured P14 are separated by a distance S along the length direction X. The setting method of the multiple points to be measured P1~P14 in this embodiment is to make the aforementioned spacing S the same. Therefore, first determine the total number of points to be measured P1~P14, and then add the number of center points C And by adding 1, the number of sections defined on the display panel 3 by the points to be measured P1 to P14 and the center point C can be calculated. In other words, the number of waiting points P1 to P14 is 28 plus 2 to calculate the number of sections as 30. Since the length of the imaginary plane I in Fig. 6 along the length direction X is the same as the chord length d in Fig. 5, the length of the imaginary plane I divided by the number of sections 30 can calculate the length of each section. The length in the longitudinal direction X is about 20 mm, so the aforementioned pitch S is set to 20 mm.

By adjusting the distance S between the center point C and the corresponding adjacent point to be measured P1, the distance S between every two adjacent points to be measured P1~P14, and the distance between each side 32 and the corresponding adjacent point The points to be measured P14 are set in the same way along the length direction X with the spacing S, which can more evenly obtain the corresponding sections (such as the center point C and the corresponding phases) defined by the spacing S after the display panel 3 is bent. The section between adjacent points to be measured P1 and the section between each two adjacent points to be measured) change in the depth of the depression, so as to improve the arc trend line and the arc reference line required later. Curvature accuracy. It should be noted that in other embodiments, the distance between the center point C and the corresponding adjacent point to be measured P1 and the distance between every two adjacent points to be measured P1 to P14 can also be set to be different. The distance between any two points to be measured can also be set to be different from the distance between any other two points to be measured, and is not limited to the manner disclosed in this embodiment.

Refer to Figure 6 and Figure 7, when measuring the depth of each point to be measured P1~P14, the vertical distance between each point to be measured P1~P14 and the imaginary plane I along the depth direction Y is measured to obtain an actual depth first D1~D14. Then judge according to the actual depth D1~D14 to determine the depression depth D1'~D14'. Since the actual depth measured by every two symmetrical points to be measured P1~P14 (for example, the actual depth D1 measured by the two points to be measured P1) may be the same or slightly different. Therefore, it is necessary to perform a judging step according to the actual depth value to determine the depth of the depression. If the two actual depth values are the same, use this value as the depression depth. If the two actual depth values are different, a fine-tuning correction action is performed, for example, the average value of the two values is taken as the depression depth, or one of the values is taken as the depression depth. In this embodiment, if the values of the two actual depths D1 are, for example, 36 mm, 36 mm is used as the recess depth D1'. If one value of the actual depth D1 is, for example, 36.5 mm, and the other value of the actual depth D1 is, for example, 35.5 mm, the average value of the foregoing two values of 36 mm is taken as the depression depth D1'. In this way, the concave depths D1'˜D14' of every two points to be measured P1˜P14 that are symmetrical along the length direction X with the center point C as the axis are the same. In this embodiment, the sizes of the recess depths D1'~D14' are 36mm, 31.5mm, 27.5mm, 23.5mm, 20mm, 16.5mm, 14mm, 11mm, 8mm, 6mm, 4mm, 2mm, 0.9mm and 0.5. mm as an example.

-4E-19

+0.0006

-2E-13x+0.252。Referring to Fig. 3, Fig. 6, Fig. 8 and Fig. 9, in the arithmetic processing step S4, the central depth DC and the recess depth D1'~D14' are calculated to convert an arc-shaped reference line. Specifically, first, calculate the y-axis point coordinate value corresponding to a processing software such as Office Excel through the center depth DC and the recess depth D1'~D14' (as shown in Figure 8) and input it into the processing Within the software. Moreover, through the distance S between the center point C and the corresponding adjacent point to be measured P1, the distance S between every two adjacent points to be measured P1~P14, and the distance between each side 32 and the corresponding adjacent point The distance S between the points to be measured P14 is calculated and the coordinate value of the x-axis point corresponding to the processing software (as shown in Fig. 8) is calculated and input into the processing software. For example, the center point C of Fig. 6 is set as the origin in Fig. 9, and the two sides 32 of Fig. 6 are respectively set as the two end points in Fig. 9. The point coordinates of the aforementioned x-axis and y-axis are determined by the processing software. The numerical value is processed, so that the processing software generates an arc-shaped trend line T, and a trend line equation y=-1E-09

-4E-19

+0.0006

-2E-13x+0.252.

After that, input the aforementioned trend line equation to a drawing software such as Cero Parametric (formerly known as Pro/ENGINEER), so that the drawing software generates an arc-shaped reference line A1 as shown in FIG. 10. It should be noted that the aforementioned processing software can also be other software that can generate trend line equations, and the aforementioned drawing software can also be other software that can generate corresponding arc baselines through the input trend line equations. What is disclosed in the embodiment is limited.

Referring to FIGS. 3 and 11, in the manufacturing step S5, a curved display device 300 (as shown in FIG. 16) is manufactured according to the arc-shaped reference line A1. Specifically, the manufacturing step S5 includes the following sub-steps: a step S51 of forming an arc-shaped assembly line, a step S52 of manufacturing an arc-shaped back cover, and a step S53 of assembling the display panel.

10, 11, and 12, in step S51 of forming an arc-shaped assembly line, the arc-shaped reference line A1 is set as a center line of the curved display panel 3 (as shown in FIG. 4), and the arc-shaped reference line Based on A1, an arc-shaped assembly line A2 having the same shape as the arc-shaped reference line A1 is offset according to a required offset distance O, and the arc-shaped assembly line A2 is set as the assembly position of an arc-shaped back shell 4.

Referring to Figures 11, 12 and 13, in step S52 of manufacturing the arc-shaped back shell, the arc-shaped back shell 4 is manufactured according to the arc-shaped assembly line A2, so that the arc-shaped back shell 4 has the same arc as the arc-shaped assembly line A2. The curved front frame surface 41.

Referring to Figure 14, Figure 15 and Figure 16, in the assembling of the display panel step S53, an adhesive member 5 is first pasted on the arc-shaped front frame surface 41 of the arc-shaped back shell 4, the adhesive member 5 is a frame-shaped double Face foam tape. Subsequently, a rear panel surface 33 of the display panel 3 is aligned with the arc-shaped back shell 4 and the adhesive member 5, and a force is applied to the front panel surface 31 of the display panel 3 in a force direction F so that the rear panel surface 33 faces the arc-shaped back surface. The shell 4 approaches. After that, continue to apply force to press the display panel 3 into the arc-shaped back shell 4 to make the display panel 3 bend and deform according to the curvature of the arc-shaped back shell 4. The rear plate surface 33 of the display panel 3 is adhered to the arc-shaped front frame surface 41 of the arc-shaped back shell 4 through the adhesive member 5, so that the display panel 3 can be fixed in a bent and deformed state as shown in FIG. 16. At this time, the manufacturing of the curved display device 300 is completed.

10 and 16, because the arc reference line A1 in FIG. 10 is the center line of the display panel 3 after bending, and the arc reference line A1 is derived from the arc 2 in FIG. 5, therefore, the arc reference line There is no tangent point between A1 and the perfect circle formed by the preset radius of curvature R in FIG. 5. In this way, the display panel 3 of the curved display device 300 will not cause stress concentration and light leakage due to the factor of the tangent point.

In summary, the manufacturing method of this embodiment does not produce a tangent point between the arc reference line A1, which is the center line of the display panel 3 after bending, and the perfect circle formed by the preset radius of curvature R. Therefore, the display panel 3 will not cause stress concentration and light leakage due to the factor of the tangent point, and can effectively improve the quality of the display screen, so it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to This invention patent covers the scope.

2: arc 20: Sector structure 21: Endpoint 3: display panel 31: Front panel 32: side 33: rear panel 4: Curved back shell 41: Curved front frame surface 5: Pasting parts 300: Curved display device A1: Arc base line A2: Curved assembly line C: center point DC: center depth D1~D14: Actual depth D1’~D14’: Depth of depression L: preset arc length L’: Length R: preset radius of curvature θ: central angle h: string height d: chord length I: imaginary face P1~P14: points to be measured S: Spacing T: Trend line O: Offset distance F: direction of force S1: Calculation steps S2: Steps for bending the display panel S3: Measurement procedure S4: Operational processing steps S5: manufacturing steps S51: Steps to form an arc assembly line S52: Steps for manufacturing curved back shell S53: Assemble the display panel steps X: length direction Y: depth direction

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Fig. 1 is a top view of a conventional curved display device; FIG. 2 is a schematic diagram of the curved surface design of the existing curved surface display device; 3 is a step flow chart of an embodiment of a method of manufacturing a curved display device of the present invention; 4 is a top view of a display panel used in this embodiment; Figure 5 is a schematic diagram of the embodiment, illustrating the relationship between a radius of curvature, a preset arc length, a central angle, and a chord height; 6 is a top view of the display panel used in this embodiment, illustrating that the display panel is bent so that a center depth is the same as the chord height; FIG. 7 is a table of this embodiment, illustrating the depression depth values of a plurality of side points; FIG. 8 is a table of the embodiment, illustrating the point coordinate values of the x-axis and y-axis input to a processing software; Figure 9 is a diagram of the processing software used in the embodiment, illustrating an arc-shaped trend line generated by the processing software; Figure 10 is a drawing of a drawing software used in this embodiment, illustrating an arc-shaped reference line and an arc-shaped assembly line generated by the drawing software; FIG. 11 is a sub-step flowchart of a manufacturing step of the embodiment; Figure 12 is a top view of an arc-shaped back shell manufactured in this embodiment; Figure 13 is a perspective view of the arc-shaped back shell manufactured in this embodiment; 14 is a top view of the arc-shaped back shell and the display panel manufactured by the embodiment; 15 is a top view of a curved display device manufactured in this embodiment, illustrating that the display panel is fixed to the curved back shell through an adhesive member; and FIG. 16 is a perspective view of the curved display device manufactured in this embodiment.

S1: Calculation steps

S2: Steps for bending the display panel

S3: Measurement procedure

S4: Operational processing steps

S5: manufacturing steps

Claims (10)

A method for manufacturing a curved display device includes the following steps: Provide a preset radius of curvature and a preset arc length, calculate a chord height from the preset radius of curvature and the preset arc length, the preset arc length and a length taken by a display panel along a length direction the same; Bending the display panel so that a center point of the display panel in the length direction is recessed along a depth direction perpendicular to the length direction and a center depth is the same as the chord height; A plurality of points to be measured are set between two sides of the display panel spaced apart along the length direction and the center point, and the depth of each point to be measured recessed in the depth direction is measured to obtain a recess depth; Perform arithmetic processing on the depth of the center and the depth of the depression to convert an arc-shaped reference line; and A curved display device is manufactured according to the arc-shaped reference line. The method for manufacturing a curved display device according to claim 1, wherein, in the arithmetic processing step, the center depth, the recess depth, the distance between the center point and the corresponding adjacent point to be measured, each The distance between two adjacent points to be measured and the distance between each side edge and the corresponding point to be measured are calculated to calculate the point coordinate value and input it into a processing software, so that the processing software generates a Trend line equation, and then input the trend line equation to a drawing software to generate the arc-shaped reference line. The method for manufacturing a curved display device according to claim 2, wherein the waiting point to be measured is symmetrical along the length direction with the center point as an axis, and the center point is spaced apart from the corresponding adjacent point to be measured along the length direction A distance, every two adjacent points to be measured are separated by the distance along the length direction, and each side edge is separated from the corresponding adjacent point to be measured by the distance along the length direction. The method for manufacturing a curved display device according to claim 3, wherein the preset radius of curvature and the preset arc length are substituted into an arc length formula to calculate a central angle, and then the preset radius of curvature and the preset arc length The central angle is substituted into a chord length formula to calculate a chord length, and the number of waiting points is added by 2 to calculate the waiting point and the number of sections defined by the center point on the display panel , Divide the chord length by the number of segments to obtain the pitch value. The method for manufacturing a curved display device according to claim 2, wherein the coordinate value of the y-axis point corresponding to the processing software is calculated through the center depth and the depression depth, and the center point and the corresponding adjacent to the to-be-measured value are calculated through the center point and the depression depth. The distance between the points, the distance between every two adjacent points to be measured, and the distance between each side and the corresponding point to be measured are calculated to correspond to the x-axis point coordinates of the processing software Numerical value. The method for manufacturing a curved display device according to claim 1, wherein when calculating the chord height, first substitute the preset radius of curvature and the preset arc length into an arc length formula to calculate a central angle, and then Substitute the preset radius of curvature and the central angle into a chord height formula to calculate the chord height. The method for manufacturing a curved display device according to claim 1, wherein the waiting point is symmetrical along the length direction with the center point as an axis, and an actual depth is first obtained when measuring the depth of each point to be measured, and then A judgment is made according to the actual depth to determine the depth of the recess, so that the depth of the recess is the same for every two points to be side symmetrical along the length direction with the center point as an axis. The method for manufacturing a curved display device according to claim 7, wherein the actual depth value of the two symmetrical points to be measured is determined, and if the two actual depth values are the same, the value is used as the recess depth, if the two If the actual depth values are different, fine-tuning is performed, and the average value of the two actual depth values is taken as the depression depth. The method for manufacturing a curved display device according to claim 1, wherein the step of manufacturing the curved display device includes: The arc reference line is set as a center line of the display panel after bending, and an arc-shaped assembly line with the same shape as the arc-shaped reference line is offset based on the arc-shaped reference line, and the arc-shaped assembly line Set as the assembly position of an arc-shaped back shell; Manufacture the arc-shaped back shell with the same arc as the arc-shaped assembly line; and Assembling the display panel on the arc-shaped back shell makes the display panel bend and deform according to the curvature of the arc-shaped back shell. The method for manufacturing a curved display device according to claim 9, wherein the arc-shaped back shell has an arc-shaped front frame surface with the same arc as the arc-shaped assembly line, and the display panel is adhered to the arc through an adhesive member Shaped front frame surface.

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