Display device with uniform off-axis brightness reduction

By introducing alignment control of specific optical elements and liquid crystal delayers into the display device, the problem of uneven brightness in the prior art is solved, and a more uniform brightness distribution and better privacy function are achieved.

CN114868050BActive Publication Date: 2025-03-25REALD SPARK LLC
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Patent Information

Application Number
CN202080089170.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2020-07-29
Filing Date
2020-11-12
Publication Date
2025-03-25
Estimated Expiration
2040-11-12

AI Technical Summary

Technical Problem

In providing privacy functions, existing display devices are difficult to achieve brightness uniformity, especially in off-axis positions, resulting in uneven brightness perceived by the viewer.

Method used

By introducing a spatial light modulator, a linear polarizer, an additional polarizer and a polarity control retarder into the display device, the alignment of the liquid crystal material is controlled by using the surface alignment layer of the liquid crystal retarder to ensure that the angle of the in-plane components of the liquid crystal material changes monotonically along a predetermined axis, thereby adjusting the brightness distribution of the display device.

Benefits of technology

It realizes reducing brightness changes in part of the display device and providing a more uniform brightness distribution, which can not only provide uniform brightness for coaxial viewers, but also reduce brightness for off-axis viewers, thereby improving the effect of privacy functions.

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Abstract

The present invention discloses a display device, which includes a spatial light modulator, the spatial light modulator having a display polarizer arranged on one side of the spatial light modulator, the display device having an additional polarizer arranged on the same side as the display polarizer and a polarity control retarder between the additional polarizer and the display polarizer. The polarity control retarder includes a liquid crystal retarder having two surface alignment layers, the surface alignment layers being arranged adjacent to a layer of liquid crystal material on an opposite side. The surface alignment layers provide alignment in adjacent liquid crystal materials having an in-plane component, wherein the angle of the in-plane component varies monotonically on the display device along a predetermined axis, providing a brightness reduction in a direction deviating from the viewing axis, and improving the uniformity of the brightness reduction in a direction deviating from the viewing axis.
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