Illumination device and display device
A technology for lighting devices and display devices, applied in projection devices, color photography, optics, etc., can solve problems such as lowered display image quality and uneven illumination brightness, so as to improve display image quality, reduce the generation of interference patterns, Effect of suppressing brightness unevenness
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Deformed example 2
[0066] Modification 2 (In this example, the emission frequency includes multiple frequency components)
[0067] Modification 3 (In this example, the relationship between the vibration frequency and the frequency of changes in the brightness of the illumination light is considered)
[0068] Modification 4 (In this example, the control unit dynamically controls the emission frequency and vibration frequency)
[0069] Modification 5 (In this example, a diffractive element is used as an optical element)
[0070] Modification 6 (In this example, a liquid crystal element is used as an optical element and the liquid crystal element is electrically vibrated)
[0071] Modification 7 (In this example, white noise is considered in terms of brightness unevenness)
[0072] Other modifications
[0073] One, embodiment
[0074] Overall structure of display device 3
[0075] figure 1 The overall structure of the display device (display device 3) of the embodiment of the present invention is shown. The di...
Deformed example 1
[0191] In the above embodiment, such as Figure 17 As shown in part (A) and part (C), it is assumed that the luminous waveform (rectangular wave) formed by the laser beam rises sharply, and only high-frequency waveforms are generated, and the frequency of these waveforms is the luminous waveform Odd multiple of frequency. But in many cases, such as Figure 17 As shown in parts (B) and (D), the light-emitting waveform formed by the laser beam may be smooth at its rising edge due to the response speed of the liquid crystal, etc. In addition, in the above embodiment, for example, Figure 17 As shown in the parts (A) and (B), the light emission waveforms generated by the respective laser sources 11R, 11G, and 11B are set to have a duty ratio of 50%. But in fact, it is more common, such as Figure 17 As shown in parts (C) and (D), the light emission waveforms generated by the respective laser sources 11R, 11G, and 11B are set to have a duty ratio of 33%.
[0192] When the light-emitt...
Deformed example 3
[0197] The above description was made assuming that the vibration frequency f0 of the optical element 14 is equal to the brightness change frequency f2 of the illumination light (the brightness change frequency of the illumination light due to the vibration of the optical element 14). But in reality, the vibration frequency f0 is often different from the change frequency f2. For example Figure 19 As shown in parts (A) and (B), if the optical element 14 consists of a one-dimensional cylindrical lens array, and the vibration amplitude of the optical element 14 corresponds to twice its frequency, then one of the optical elements 14 The flicker frequency (or change frequency f2) of the brightness distribution generated on the vibration period corresponds to four times the vibration frequency f0 (f2=4×f0).
[0198] Basically, the vibration frequency f0 represents the flicker frequency of the brightness distribution. Therefore, in this case, the following substitutions are made to th...
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