Field Sequential Display Light Source Intensity Control
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Solution Overview
Problem
Conventional field sequential type display devices have low light utilization efficiency and high power consumption due to suboptimal light emission intensity settings, leading to a yellowish white display color instead of pure white when maximum luminance is required.
Innovation Solution
A field sequential type display device with a light source section comprising red, green, and blue light sources, where one frame period is divided into four subfield periods, with the third light source emitting at twice the intensity of the first two in other periods, and a signal separation section that adjusts transmittance to maximize light output for white display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the light sources of each color emit light with the same light emission intensity in each subfield period, then the device complexity is reduced and ease of operation is improved, but the light utilization efficiency deteriorates and power consumption increases
Solution Approach 1:
The patent applies parameter changes by setting different light emission intensities for different light sources. Specifically, the third light source emits light with an intensity that is twice that of the first and second light sources. This parameter differentiation optimizes light utilization efficiency while maintaining operational simplicity through automated control.
2Manufacturing precision
If the transmittance of the light modulation element is set to 50% in red, green, and yellow subfield periods to achieve white display color, then the display color accuracy is improved, but the light utilization efficiency deteriorates
Solution Approach 1:
The patent changes the light emission intensity parameter of the third light source to twice that of the other light sources. This parameter adjustment allows the light modulation element to operate at maximum transmittance (100%) while still achieving accurate white display color, thereby resolving the contradiction between color accuracy and light utilization efficiency.
3Loss of energy
If the light emission intensity of the third light source is set to twice that of the first and second light sources, then the light utilization efficiency is improved and power consumption is reduced, but the device complexity increases
Solution Approach 1:
The patent implements self-service through automated control systems that manage the differentiated light emission intensities. The control apparatus automatically adjusts the third light source to emit at twice the intensity of the other sources, eliminating the need for manual intervention and offsetting the increased device complexity with automated self-regulation.
4Use of energy by stationary object
If the light emission intensity of the third light source is increased to twice that of the other light sources, then the power consumption is reduced, but the drive conditions (voltage, current, length of light emission period) become more complex
Solution Approach 1:
The control apparatus provides self-service by automatically managing the complex drive conditions required for the third light source to emit at twice the intensity. This includes automated adjustment of voltage, current, and light emission period, reducing power consumption without requiring manual intervention to manage the increased complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces color break and enhances light utilization efficiency, allowing for a pure white display with reduced power consumption by optimizing light emission intensities and transmittance settings.
Implementation Method 1
a light modulation section (15) including light modulation elements (16) and configured to modulate light emitted from the light source section (21)
Data Source
AI summary
A light source section 21 includes a red light source 22r, a green light source 22g, and a blue light source 22b, and one frame period is divided into four subfield periods. Light sources of each color respectively emit light in blue, green, and red subfield periods, and the red light source 22r and the green light source 22g emit light in a yellow subfield period. Light emission intensity of the blue light source 22b in the blue subfield period is set to twice light emission intensities of the red light source 22r and the green light source 22g in other subfield periods. Color breakup is reduced by displaying the yellow subfield, and light utilization efficiency improved by setting transmittance of a light modulation element 16 to 100% when a white signal by which each gradation of red, green, and blue becomes maximum is input. With this, a field sequential type display device which can reduce color breakup and has high light utilization efficiency is provided.