JP2013054372A5 - - Google Patents

Description

As a result of investigating the law of occurrence of coating unevenness 155, the inventors of the present application have found that the radiation direction from the rotation axis of the spin coater, that is, the direction in which the coating solution is spread by centrifugal force, and the arrangement direction of the bent portion of the source driver wiring It was found that this occurs when (indicated by arrows βA and βB in FIG. 2) match or the angular difference is in the range of less than about 15 ° . Specifically, the coating unevenness occurs most clearly when they match, and it becomes thinner as the angle difference increases, and is below the allowable limit at approximately 8 ° or more, and at a level that cannot be recognized as unevenness at approximately 15 ° or more. It has been found to be reduced.

That is, as a condition for causing the problem to be solved by the present invention, a plurality of wirings and the like have a shape in which the shape of the step is parallel, and the wirings and the like have a bent portion and are bent. The liquid material is applied when a process is performed in which the liquid material is applied by rotation with an axis perpendicular to the substrate and the resulting centrifugal force in a state where the parts form a macro array. This means that the angle difference between the direction of expansion (radial direction from the center of rotation) and the arrangement of the bent portions is in a range of less than about 15 ° . Further, even if it is less than 15 ° , it is practically acceptable if it is approximately 8 ° or more.

Next, acrylic resin is spin-coated and baked to flatten the pixel formation portion. In consideration of the maximum height difference (a little less than 1 μm) of the pixel region, the coating film thickness is set to be 1 to 2 μm when it is applied on a flat substrate without unevenness. At this time, the flow direction of the array and the spin coating of the wire bending portion that is, produce a coating nonuniformity in the range radiation direction is less than match or approximate 15 ° from the center of rotation, especially when roughly less than 8 °, the display problems It becomes uneven.

The conditions for occurrence of coating unevenness in the panel arrangement of FIG. 2 are quantitatively confirmed. Since the lower half of FIG. 2 does not satisfy the generation condition and the upper half is symmetrical with respect to the left and right lines, attention is paid to the upper right region. 5 cuts out the upper right area of FIG. 2 and displays numerically the angle δ between the straight line 162 connecting the bent portion array intersection 161 of each panel and the spin coating rotation center 160 to the reference line 162. When the angles δ are arranged in ascending order, they are 6.9, 13.7, 32.3, 48.3, 51.8, and 66.3. In FIG. 5, the angle θ1 of the bent portion arrangement of the panel is plotted at about 31 ° , and the difference between δ and θ1 is 1.3 ° in the second panel from the upper right where δ = 32.3 ° , and uneven coating occurs. Occur. Before and after δ, there is a sufficient difference (about 17 ° ) with respect to the generation condition, and it can be seen that coating unevenness does not occur. The widest interval in the array of angles δ is 13.7 to 32.3 ° with a difference of 18.6 ° . If θ1 is set at 23.0 ° , which is between the two, the difference between the two is 9.3 ° , which is outside the unevenness occurrence condition (an angular difference of less than 8 ° ) that causes display problems.

Next, the wiring width that can be arranged at this time is obtained. When the routing area of the source driver wiring is modeled as shown in FIG. 6, Ppix: pixel pitch, Pic: driver IC output terminal pitch, N: number of pixels in the horizontal direction, L: routing area width, θ1: bend arrangement angle, The relationship between θ2: pixel side wiring angle and Ps: pixel side wiring (inclined portion) pitch is obtained. As a specific condition, the relationship between each parameter when Ppix = 141 μm, Pic = 60 μm, and N = 240 is set as an example in a panel equipped with a switch that switches the source driver output to RGB 3 lines by SOG is shown in FIG. . With this model, the condition (θ1) for eliminating coating unevenness can be considered together with the necessary area (L) on the layout and the possibility of wiring arrangement (Ps). Become .theta.1 ≒ 23 ° in terms of the present embodiment, Ps = 42 .mu.m, with θ1 = 22.8 °, the this case L = 3.03 mm. Since Ps = 42 μm in the inclined portion where the wiring pitch is narrower, the wiring interval is 32 μm when the wiring width is 10 μm, and wiring can be performed with a margin. FIG. 8 shows an image (a) of the wiring routing area and an enlarged view (b) of the wiring shape near the wiring bent portion.

The wiring portions of all the panels as described above, made large and δ and difference of each panel, by a .theta.1 ≒ 23 ° possible to the angle difference 8 ° or more, to suppress the occurrence of uneven coating as a display problem be able to.

Similar to the second embodiment, wiring is designed based on the panel arrangement of FIG. When the angles δ are arranged in ascending order, they are 6.9, 13.7, 32.3, 48.3, 51.8, and 66.3. In FIG. 5, the angle θ1 of the bent portion arrangement of the panel is plotted at about 31 ° , and the difference between δ and θ1 is 1.3 ° in the second panel from the upper right where δ = 32.3 ° is 1.3 ° . Application unevenness occurs. Therefore, in the third embodiment, the uneven design condition is avoided by changing the wiring shape of the panel, which is the condition for generating the unevenness, in the basic design. Specifically, for δ: 32.3 ° , θ1 = 13 ° is selected as a method for avoiding the unevenness generation condition. [delta]: There is a difference of 19.3 ° and 32.3 °, unevenness is eliminated can condition (15 ° or more). 6 the shape of this time, if confirmed by FIG. 7, to become .theta.1 ≒ 13 ° is, Ps = 24 [mu] m, at .theta.1 = 13.1 °, the this case L = 1.68 mm. Since Ps = 24 μm at the inclined portion with the narrower wiring pitch, the wiring width of 10 μm can be routed with the wiring interval of 14 μm. FIG. 9 shows an image (a) of the wiring routing area and an enlarged view (b) of the wiring shape near the wiring bent portion.

By disposing the panel P1 with θ1 of 31 ° and the panel P2 with θ1 of 13 ° in combination so as to be P2 at a position where δ is 32.3 ° as shown in FIG. .

In this embodiment, P1 is used as the basic pattern and P2 is partially used. However, P1 may be arranged at a position where δ is 13.7 ° based on P2, and δ It is possible to combine other arrangements in which the relationship of θ1 is a relationship that does not cause coating unevenness, which is effective. Furthermore, in this embodiment, two types of panels, P1 and P2, are combined, but it is possible to combine three or more types of designs, and unevenness can be eliminated by setting the relationship between δ and θ1 appropriately. The effect is obtained.