Liquid crystal display device
A technology of liquid crystal display device and liquid crystal layer, which is applied in the directions of instruments, nonlinear optics, optics, etc., can solve the problems of lowering display quality and lowering contrast, and achieves the effect of excellent reliability.
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no. 1 approach
[0042] figure 1 (a) is a schematic sectional view showing the liquid crystal display device of the first embodiment, figure 1 (b) is a schematic cross-sectional view showing an example of the structure of a TFT substrate. Such as figure 1 As shown, the liquid crystal display device 10 of the first embodiment has in order from the observation side to the back side: a first polarizing plate 51, a first λ / 4 retardation layer 60, a color filter substrate 20, and a first alignment film 21. , a liquid crystal layer 30 , a second alignment film 41 , a TFT substrate 40 and a second polarizing plate 52 . In the case of a transmissive or semi-transmissive liquid crystal display device, a backlight (not shown) that irradiates light to the liquid crystal layer 30 is disposed on the back side of the second polarizing plate 52 . In addition, the first λ / 4 retardation layer 60 is disposed outside the liquid crystal cell (closer to the observation side than the support substrate 22 ), s...
no. 2 approach
[0076] The liquid crystal display device of the second embodiment has the same configuration as the liquid crystal display device of the first embodiment described above except that it does not have the second overcoat layer. Compared with the liquid crystal display device of the first embodiment, the liquid crystal display device of the second embodiment is not provided with the second overcoat layer. In this respect, the number of manufacturing steps can be reduced and the productivity can be improved.
[0077] figure 2 It is a schematic sectional view showing the liquid crystal display device of the second embodiment. Such as figure 2 As shown, the liquid crystal display device 110 of the second embodiment includes in order from the observation side to the back side: a first polarizing plate 51, a first λ / 4 retardation layer 60, a color filter substrate 120, and a first alignment film 21 , a liquid crystal layer 30 , a second alignment film 41 , a TFT substrate 40 and a...
Embodiment 1
[0088] The liquid crystal display device of Example 1 has the same figure 1 The liquid crystal display device of the first embodiment shown has the same configuration, the liquid crystal drive mode is the FFS mode, and the embedded retardation layer 25 is formed by coating. In the liquid crystal display device of Example 1, the first overcoat layer is provided between the embedded retardation layer and the first alignment film, so that the display defects in the liquid crystal display device of Comparative Example 2 can be prevented.
[0089] (Evaluation results)
[0090] The liquid crystal display devices of Comparative Examples 1 and 2 and Example 1 were placed in a thermostat at 70° C., and a voltage of 5 V was continuously applied at a frequency of 60 Hz with the backlight turned on. Initially, after 100 hours (100h), after 240 hours (240h) and after 500 hours (500h), a voltage of 1V was applied at a frequency of 1Hz to measure the voltage retention rate (VHR), and the v...
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Abstract
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