Display Device with Field-Sequential Light Emission
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Solution Overview
Problem
The existing display devices face limitations in increasing the scattering rate of light to improve visibility, as the voltage applied to pixel electrodes is constrained by the output range of the drive circuit, hindering the visibility of the background and image when viewed from one surface of the display panel to the other.
Innovation Solution
A display device comprising a first and second light-transmitting substrate with a liquid crystal layer filled with polymer dispersed liquid crystals, and light emitters that emit light in a field-sequential system, where the drive circuit converts input signals into output signals with gradation values for RGB colors, allowing for increased luminance and visibility by adjusting the voltage and pulse width modulation duty cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the voltage applied to pixel electrodes is increased to increase the scattering rate of light, then the visibility of the image is improved, but the voltage exceeds the upper limit of the drive circuit output range
Solution Approach 1:
The light emitter alternates between emitting light and not emitting light in a periodic manner (field-sequential system), allowing the liquid crystal layer to scatter light effectively during emission periods without requiring continuous high voltage, thus improving visibility while staying within drive circuit voltage limits
Solution Approach 2:
The invention changes the operating parameters by using field-sequential light emission with controlled duty cycles, transforming the approach from continuous high-voltage scattering to periodic light emission with optimized voltage application, resolving the contradiction between visibility and voltage constraints
2Illumination intensity
If the scattering rate of light is increased to improve visibility, then the image visibility is enhanced, but the background becomes invisible when viewed from one surface of the display panel
Solution Approach 1:
By using periodic field-sequential light emission, the system allows light to pass through the liquid crystal layer during non-emission periods when scattering is minimal, preserving background visibility, while during emission periods the scattered light provides enhanced image visibility
Solution Approach 2:
The drive circuit pre-processes input signals to generate appropriate voltage levels and timing for field-sequential operation, preparing the liquid crystal layer in advance to achieve both high scattering rate during emission and sufficient light transmission for background visibility
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
The solution enhances visibility by allowing higher luminance and improved image display without exceeding the voltage limit of the drive circuit, enabling better contrast and visibility of the background and image.
Implementation Method 1
the scattering rate of the light needs to be increased to improve visibility of display
Implementation Method 2
a light modulation layer and a light source. The light modulation layer is disposed between a pair of transparent substrates, and includes a plurality of light modulation devices that have predetermined refractive index anisotropy and differ in responsiveness to an electric field generated by electrodes provided on the transparent substrates
Implementation Method 3
any one of a first color, a second color, a third color, and a fourth color emits light in a field-sequential system
Implementation Method 4
a liquid crystal layer comprising polymer dispersed liquid crystals filled between the first light-transmitting substrate and the second light-transmitting substrate
Data Source
AI summary
A display device is provided and includes first light-transmitting substrate; second light-transmitting substrate opposed to the first light-transmitting substrate; liquid crystal layer between the first light-transmitting substrate and the second light-transmitting substrate; first electrode and a second electrode disposed so as to sandwich the liquid crystal layer; and light emitter comprising a first light emitter configured to emit light in a first color, a second light emitter configured to emit light in a second color, and a third light emitter configured to emit light in a third color, wherein first light emitter has a temperature characteristic in which a relative light intensity decreases more with increase in a heating temperature than in the case of the second light emitter and the third light emitter.